Font size
WorksheetsH12-831-halaman-1/7
Total questions: 322
Worksheet time: 3hrs 58mins
In OSPFv3, an LSA whose propagation range is one area has (a) kind.
BFDLink state detection at the heart (millisecond) level can be achieved.
True
False
Which of the following statements about the multicast address used by OSPFv3 is correct?
DR routers use FF08::6
All OSPF routers use FF08::5
All SPF Routers use FF02::5
DRThe router uses FF02::6
By executing (a) , the command can completely isolate the second and third layer users of different ports on the same LAN and cannot communicate. (Please use English and lowercase letters to complete the command, and the command cannot be abbreviated)
Which of the following operations is not part of the middle stage of dissection?
field defense
cutover implementation
Cutover preparation
Business Test
Cutover: The previous information collection can be used to determine whether the services before and after the cutover are normal.
True
False
BGP authentication can prevent illegal routers from establishing neighbors with BGP routers. BGP authentication can be divided into ID5 authentication and Keychain authentication. Which of the following BGP packets will carry BGP Keychain authentication information?
Open
Keepalive
Update
Notification
In the topology shown in the figure, the entire network runs OSPFv3 agreement. In the case of attracting external routes, R1 generates which type of LSA?
Type 5 LSAIntra-Area-Prefix-LSA
Link-LSA
Inter-Area-Router LSA
Inter-Area-Prefix-LSA
How many bits are there in the label field of PLS?
1
8
3
20
As shown in the figure, SF is enabled on all interfaces of the router, the cost value of the link is marked in the figure, and the Loopback0 interface of R2 is advertised in area 1, then the cost value of R1 reaching 10.0.2.2 is?
100
150
50
200
An engineer uses two routers to test IPv6 services, and runs OSPFv3 to implement IPv6 network interconnection. R1 is required to be able to access the loopback interface address of R2. The engineer checked the OSPFv3 routing table entry of R1, as shown in the figure, and found that there was no route to the loopback interface address of R2. Which of the following reasons could not be the cause?
R2 advertises the loopback interface into different OSPFv3 processes
R2 does not have OSPFv3 enabled on the loopback interface
R2 does not use network to advertise loopback address in area 0
R2 is not configured with the Router ID used in the OSPFv3 process
About OSPF, Which of the following statements is false?
For a pair of additional 0hers on an Ethernet link, it is normal to stop clearing in the 2-72 state
Stalling in ExStart state may be a bad match between neighbor routers
stagnantINTn the t state indicates that the router has received the neighbor's Hello message, but Hello message does not include this router OSPF Router ID
The two router databases are synchronized, SPF An error occurred in the calculation, it must be because of the RouterID repeated
In the same environment, engineers A and B execute the tracert command to the same destination address, but the paths are different. What could be the possible reasons?
The phenomenon is abnormal, the device has an operating system failure
Engineer A's operation error
Engineer B's operation error
The destination port numbers of the UDR packets serving tracert are different, and the hashes
reach different equivalent next hops
Which of the following is included in the routine collection of basic equipment information?
License information
Patch information
The software version the device is running
Whether the configuration is saved
According to this picture, we can judge that R4 is on?
1 default route
2 equal-cost default routes
2 default routes with different costs
4 equivalent default routes
IGP converges faster than BGP, which may cause network traffic loss. By enabling the OSPF and BGP linkage feature of the device, the device can keep the OSPF and BGP linkage during the set linkage time. (a) The router makes the link metric value in the LSA advertised to be the maximum value, so as to inform other OSPF devices not to use this router to forward data, so as to avoid traffic loss. (Note: If English letters are involved, all uppercase)
OSPF is deployed in a campus to achieve network interworking, and OSPF is also enabled on the GEO/0 interface of R3. Area1 is deployed as an NSSA area, and the device addresses are shown in the figure. An engineer configures a static route on R3 to access the loopback interface address of R4, and imports the static route in the 0SPF process. At this point, in the Type5 LSA received by R1, the forwarding address (FA) is (a) . (Note: Please fill in the IP address without mask)
As shown in the figure, in a medium-sized network, BGP generally deploys dual RRs to improve R reliability. When deploying dual RRs, the Cluster IDs of the two RRs are generally set to be the same. The reason for this is
Prevent RR from receiving too many routes and causing insufficient memory
prevent suboptimal
Precent loops
Prevent the client from receiving too many routes and causing it to run out of memory
According to this picture, you can judge
The optimal outgoing interface for R1 to access room 3000: FDEA::3 is GigabitEtherneto/0
. R1 with 3000:FDEA::3 is IB6P neighbor
. R1 has a TCP connection with 3000:FDEA::3
R1 learned route 3002 through IBGP::3
Link LSAs of OSPXv3 are propagated throuhgt the area
True
False
IS-IS is a link-state routing protocol that uses the SPF algorithm for route calculation. As shown in the figure, a campus deploys both IPv4 and IPv6 and runs IS-IS to achieve network interconnection. R2 only supports IPv4. Which of the following statements is true about the topology calculation of this network?
If you want IPv4 and IPv6 network computation to form the same shortest path tree, you need to
run the ipv6 enable topology ipv6 command to enable the IPv6 capability in the IS-IS process
By default, since R2 does not support IPv6, in the shortest path tree formed by IPv6 network
calculation, the path from R1 to R4 is: R1-R3-R4
By default, IPv4 and IPv6 networks will be calculated separately to form different shortest path
trees
By default, in the shortest path tree formed by IPv6 network calculation, the path from R1 to R4 is:
R1-R2-R4. Since R2 does not support IPv6, R2 will directly discard IPv6 packets after receiving them,
causing traffic loss.
(a) Local Link range
(b) Autonomous system-wide intra regional propagation
(c) intra-regional spread
The following description of TL in PLSHeader is correct:
Limit the LSR
Control of upstream equipment for label distribution
Similar to the TTL in the IP header, it is used to prevent packet loops
To control label distribution
In PLSVPN, in order to distinguish IPv4 prefixes that use the same address space, the value of R0 is added to the IPv4 address. The correct description of the following options is:
On a PE device, each VP instance corresponds to a value of 0. On the same PE device, the RD value must be unique. ____, ____, ____.
RD can be used to control the publication of 1 routing information
RD is encapsulated in Update message as BGP extended community attribute during delivery
After the PE receives the IPv4 route from the CE, it adds RD to the IPv4 route to convert it into a globally unique VPN-IPv4 route, and publishes it on the public network
As shown in the figure, R1, R2, R3, and R4 are in the same PLs domain, and LDP is used to distribute IPLS labels between devices. R4 is the Egress LSR of the FEC 4.4.4.0. If you want to achieve R1 access
4.4.4.0, R4 does not need to query the label table but can know the forwarding priority of the
data, then the outgoing label of R3 for the FEC should be: (a) . (Please fill in the Arabic numerals directly, without symbols)
As shown in the figure, there is a packet containing a three-layer label header. Please select the values (decimal) corresponding to the x, and Z fields in the figure.
(a) Y
(b) Z
(c) X
About the difference between NSR and NSF, which is correct?
NSP can be done without neighbor routers
NSF must rely on neighbor routers to complete
Both NSR and NSP require neighbor routers to complete
NSR must rely on neighbor routers to complete
The RR rules for advertising routes violate the IBGP split horizon rules, which may cause loops in the AS. Which routing attributes does RR use to prevent loops?
Cluster List k
Nexthop
AS-PATH
Originator ID
Network administrator A wants to use AS-Path Filter to match the BGP routing attribute AS_PATH[100200300]. Network administrator A sorts out the four configurations in the figure. Which of the following configurations can meet the requirements of network administrator A
way A
way D
way C
Way B
As shown in the figure, on the R1 router, the network administrator can control the path of the traffic entering AS100 after modifying the value of the routing entry sent to R2 through the routing policy
True
False
The routing policy tools that can be used by BGP mainly include Filter-policy and Route-policy. Fiterpolicy can only filter routes, and Route-policy can only modify routes
True
False
As shown in the figure, in a medium-sized network, BGP generally deploys dual RRs to improve R reliability. When deploying dual RRs, the ClusterIDs of the two RRs are generally set to be the same. What is the reason for this?
Prevent RR from receiving too many routes and causing insufficient memory
prevent suboptimal
prevent loops
Prevent the client from receiving too many routes and causing it to run out of memory
A campus has deployed IPv6 for service testing. There are 4 routers in the network, running 0SPFv3 to implement IPv6 network interconnection. As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of the Link-LSAs. Which of the following statements is true about the description of this LSA?
The router that generates this LSA is R2 port R2 connected
IPv6 address prefix for GEO/0/0: 2001:DB8:2345:23::
The link-local address of R2 interface GEO/0/0 is: FE80::2E0:FCFF:FEC, D:4F79
The SA shows 2 does not support external routing, but participates in IPv6 routing calculation
In BGP4+, what is the content of the next hop network address field carried in the P_REA, CHLRI attribute in the Update packet?
Can only be a global unicast address
can just be a link-local address
Can carry link-local addresses and global unicast addresses at the same time
Only link-local addresses
The configuration shown is performed on R2 to filter all incoming routes. Suppose there is a BGP route with the AS (a)
(b) (c) (d)
In the MPLS network, there are different operation types for labels, among which the meaning of the "pop" action is:
Replace the top label with another value
existMPLSAdd the top label to the label stack
Replace the top label with another set of labels
existMPLSRemove the top label from the label stack
The routing policy tools that can be used by BGP mainly include Filter-policy and Route-policy. Filterpolicy can only filter routes, and Route-policy can only modify routes.
(a)
According to this picture, the door can be judged?
R4belong only toLevel-2
system-IDforee8c.a0c2.baf2device whose type isLevel-1-2
system-IDforee8a0c2.baf2device whose type isLevel-1
R4belong only toLevel-1
As shown in the figure, on the R1 router, network administrator A sends the routing entry to R2 through the routing policy
After modifying the MED value, you can control the path of traffic entering the AS100
True
False
As shown in the figure, all routers run OSPF, because R3 is in the backbone area, so in the LSDB of R3 There are no three types of LSAO
True
False
From the user's point of view, any phenomenon that affects the business can be defined as a fault.
True
False
A diagram is provided showing AS 100, R1, R2, AS 200, and EBG. Is the statement true or false?
True
False
The router ID of OSPF V3 needs to be configured in dotted decimal with a length of 128 bits.
True
False
As shown in the figure, the operator's BGP/MPLS IP VPN backbone network builds SP through DP. If you want to implement user X If the two sites communicate through the BGP/MPLS IPVPN network, PE1 and PE2 must use a 32-bit masked loopback interface address to establish an MP-IBGP peer relationship.
True
False
After a fault occurs, you need to collect and back up various types of fault information in time as a reference for troubleshooting. In addition, when seeking emergency assistance from Huawei Technologies Co., Ltd.
True
False
Network administrator A wants to use A, CL to match specific routing entries. Which of the following routing entries will be matched by the A, CL rules in the figure?
acl number 2000
rule 10 permit source 10.0.0.0 0.0.0.6.0
10.0.1.0
10.0.0.0
10.0.0.1
10.0.2.0
Which of the following reasons may cause the hosts in the same VLAN of the LAN to fail to communicate with each other?
switchMA, Caddress learning errors
interface is artificialshutdownor the physical interface is damaged
The wrong port is configured on the switch andMA, Caddress binding
Port isolation is configured on the switch
IS-/S supports multi-instance and multi-process, that is, one IS-S router. Multiple VPN instances can be configured with multiple IS-IS process associated. Are the following descriptions of IS-IS multi-instance and multi-process correct?
indivualIS-ISprocess can only be used with1indivualVPNinstance association
if oneIS-ISThe router creates multipleIS-ISProcess, each process does not affect each other, independent of each other
1indivualIS-ISprocess can be associated with multiple differentVPNinstance association
1indivualVPNinstance can be associated with multiple differentIS-ISprocess association
Which of the following statements about the MP_REA, CH_NLRI attribute of BGP4+ is correct?
The length of the next hop address can be 16 or 3
AFI (address family) value is 2, represent IPv6
NLRIfield carryIPv6Routing prefix and mask information
the length of the next hop address is16Time,Network Address of Next Hopcarries the link-local address
When there are multiple redundant links in the IS-IS network, multiple equal-cost routes may appear. Which of the following statements is false about equal-cost routing within an IS-IS network?
A. When the number of equal-cost routes in the network is greater than the number configured by the command, and these routes have the same priority, Preferred next hop deviceSystem IDLarge routes for load balancing
B. If load sharing is configured, the traffic will be evenly distributed to each link
C. After configuring equal-cost route priorityJS-ISWhen the device forwards the traffic reaching the destination network segment, it will not adopt the load balancing method, but forward the traffic to the next hop with the highest priority
D. For each route in the equal-cost route, a priority can be specified, and the route with higher priority will be preferred. the rest as backup routes
As Shown below :
OSPF Process 1 with Router ID 10.0.12.1
Area: 0.0.0.0
Link State Database
Type: Sum-Net
Ls id: 10.0.23.0
Adv rtr: 10.0.12.2
Ls age: 61
Len: 28
Options: E
seq#:80000001
chksum : 0x3ae8
Netmask : 255.255.255.0
Tos 0 metric: 1 Priority: Low
A. in the pictureLSAsis generated by this router
B. ShouldLSAThe described destination network is10.0.23.0
C. ShouldLSAis of typeAS-external-LSA
D. This device isA, BR
The routing attributes of the three routing entries are shown in the figure. Assuming that the next hops of the three routing entries are all reachable, when these three routing entries are
After the entries arrive at the BP router in order, by default, BGP will finally call a route entry?
Route B
Route C
Route A
slightly
When troubleshooting the EBGP neighbor relationship, you find that the two directly connected devices use the loopback interface to establish a connection, so execute display current-configuration configuration bgp to check the unitary setting of peer ebgp-max-hop hop-count, which of the following statements is correct?
hop-count must be greater than 2
hop-count must be greater than 15
hop-count must be greater than 1
hop-count must be greater than 255
What is the command to adjust the link cost of an IS-IS interface?
isis cost
isis timer hello
isis circuit-level
isis circuit-type
As shown in the figure, OSPF is enabled on all interfaces of the router, and the IP address identified in the figure is the device's IP address. Loopback0 presses the IP address of the port, R1, R2, R3EJLoopbacD is advertised in the area 1, R4 LoopbackD advertises in area D and which of the following functional addresses can be pinged between the LoopbackD announcements of R5 and R5 in area 2?
10.0.3.3 10.0.5.5
10.0.4.4 and 10.0.2.2
10.0.2.2 and 10.0.3.3
10.0.2.2 10.0.5.5
Which of the following is not part of the preparatory work for the cutover plan?
Cutover target
Root description of the current network
risk assessment
In intra-domain MPLS VPN networks, data packets will be encapsulated with two layers of MPLS when they enter the public network and are forwarded. Label, the description of the two-layer label in the following options is wrong:
A. MPLS VPN: The outer label is made by LDP protocol or statically assigned, the inner label is assigned by the correct end MP-BGP assigned by neighbors
B. MPLS VPN: The outer layer label is called the private network label, and the inner layer label is called the public network label
C. By default, the outer label is singled out before the packet is forwarded to the last hop device
D. Layer labels are used in PE: The device sends the packet correctly to the corresponding VPN middle
According to this picture, Peimen can judge?
cR3>display ipv6 routing-table protocol isis
R3The device type must beLevel-1-2
unable to judgeR3type of device
R3The device type must beLevel-1
R3The device type must beLevel-2
Which statement about DHCP Snooping is wrong?
A. DHCP SnoopingYou can prevent illegal attacks by setting trusted ports (all interfaces are untrusted by default.
B. Global enableDHCP Snoopingfunction, without any post-parameters, the device only processes by default DHCPv4message
C. Enable in interface viewDHCP Snoopingfunction, then all theDHCPThe message command function takes effect
D. existVLANEnable in viewDHCP Snoopingfunction, then all interfaces of the device receive data belonging to thisVLANofDHCPThe message command function takes effect
In addition to virtual connections, what type of IPv6 address is the source IPv6 address of OSPFv3's Hello text?
IPv6anycast address
unique local address
Global Unicast Address
link-local address
An engineer uses two routers to test IPv6 services, and simulates the interconnection between the headquarters and branches by running BGP4+. The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between the two devices, which of the following is a statement wrong?
The Next_Hop attribute must be an IPv6 global unicast address when routing
BGP4+ transmits routing information between peers through Update packets
If the MP_REA_CH_NLRI attribute is carried in the Update packet, it indicates that the advertisement is a reachable route
When the route is transmitted, it will carry recognized mandatory attributes such as AS_Path
Which of the following regular expressions can match only BGP routes that pass through AS200 and then through AS300 eyes?
A. 200 ∣300
B. A200|A300
C. _(200 300)_
D. _[200 300]_
As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator's BGP/MPLS IPVPN. A known The public network tunnel between PE1 and PE2 has been established (the label information is shown in the figure), and PE1 has The 192.168.1.0 network segment route is advertised to PE2 through the MP-IBGP neighbor relationship, and the route learning is normal. When grabbing between P and PE1, when Site2 accesses the 192.168.1.0 data of Site1, the outermost label
what should the sign be:
6661
6662
8888
Assuming that the neighbor relationship between BGP routers has been established successfully, the configuration on R1 is shown in the figure. The route entry 10.10.10.0 can be delivered to the farthest ?
AS 200
bgp 100
peer 13.X3 as-number 300
peer B3.33 connect * interface LoopBackO peer 3.33.3 route-policy COMMUNITY e»porx peer 3333
next >hop-local
peer Xl.3.3 advertise-cofnmunity network 10.10.T0.0 24
route^poktcy COMMUNITY permit node 10 prefix COMMUNITY spply cocYWTUiiMty route-policy
COMMUNITY permit node 20 «p ip prefix COMMUNITr index 10 permit
R1
R2
R3
R4
Run the display ip interface GEO/D/D command to view statistics about ping packets received on the interface.
True
False
BGP/MPLS IP VPNs can only use LDP to construct public network tunnels.
True
False
As shown in the figure, OSPF is enabled on all interfaces of the router, in which R4 and R5 can establish OSPF virtual connections.
True
False
In an MPLS network, functions such as neighbor discovery, session establishment and maintenance, and label management are implemented by exchanging LDP messages between SRs running the DP protocol. To ensure the reliability of message delivery, all LDP messages are sent and received based on TCP connections.
True
False
Deploying port isolation technology in Ethernet can realize Layer 2 intercommunication and Layer 3 isolation, making networking more flexible
True
False
BGP routing policies can control the advertisement and reception of routes.
True
False
As shown in the figure, OSPF is deployed in a campus, and Area 1 is deployed as an NSSA area. In the case of missing header, R2 will automatically generate a missing header route of which LSA type and flood it in the NSSA area?
True
False
A campus has deployed IPv6 for service testing. In the early stage of deployment, engineers wanted to achieve network interoperability through IPv6 static routes. When creating an IPv6 static route, you can specify both the outbound interface and the next hop, or only the outbound interface or only the next hop.
True
False
When configuring the DHCP Relay function on the device, the VLAN ANIF interface of the relay connection client must be bound with a DHCP server group, and the IP address of the proxy DHCP server must be configured in the bound DHCP server group.
True
False
When MPLS is deployed in the network and the network layer protocol is IP, the route corresponding to the FEC must exist in the IP routing table of the LSR, otherwise the label forwarding entry of the FEC will not take effect.
True
False
In the DU label distribution mode, if the Liberal retention mode is adopted, the device will retain the labels distributed by all LDP peers, regardless of whether the LDP peer is the optimal next hop to the destination network segment.
True
False
The rollback operation of project cutover can be temporarily determined according to the situation during cutover, and no advance plan is required.
True
False
In BGP/MPLS IP VPN, if the OSPF protocol is used between PEs and CEs to exchange routing information, the domain identifier (Domain ID) is used to distinguish whether the incoming routes in the VPI instance come from the same OSPF domain.
True
False
If you want to check the files under Flash, which command should you use?
dir sdl:
dir sd0:
display patch-information
dir flash:
Which of the following descriptions is correct about configuring static LSPs in MPLS networks?
when a certain LSR for Egress LSR, you only need to configure In Label, The range is 16-1023
when a certain LSR for Transit LSR, you need to configure In Label and Out label; In Label The range is 16~1023, Out Label The range is 16~1048575
when a certain LSR for Transit LSR need to be configured at the same time In Label and Out Label, The range is 16-1023
when a certain LSR for Ingress LSR, just configure Out Label, The range is 16~1048575
(Multiple Choice) Identify which LSAs in OSPFv3 can be flooded in an area.
Link-LSA
Inter-Area-Router-LSA
Inter-Area-Prefix-LSA
Intra-Area-Prefix-LSA
Regarding the label space of MPLS, the description is wrong:
penultimate jumpLSRWhen performing label exchange, if the exchanged label value is found to be3,By default, the label is popped and the message is sent to the last hop
1024Above areLDP,RSVP-TE. MP-BGPLabel space shared by other dynamic signaling protocols
16~1023is staticLSPand staticCR-LSPshared tab space
If the out tag value is0,The router will directly discard the packet
Does the role of Link-LSA in OSPFv3 not include?
To the other road on the link Tiandikou noon
Advertise this router's interface to other routers on the linkID
Advertise the link-local address of this interface to other routers on the link
Advertise to other routers on the link the originatingNetwork-LSAOptions set in
According to the configuration shown in the figure below, you can know that R4 has an interface advertised into IS-IS?
1
3
2
0
Which of the following will not cause the VRRP backup group to flap?
both endsVRRPBackup group preemption delay configuration is inconsistent
BackupDevice Interface Packet Loss
the time interval of the notification message is too small
.transmissionVRRPLink flapping of advertisement packets
Regarding multi-instance CE (Mlulti-VPN-Instance CE, MCE), which of the following descriptions is wrong?
existMCEdevice needs to be differentVPNCreate their own routing table and bind to the correct interface
connected to the sameMCEbut not oneVPNInstance users cannot access each other
haveMCEfunctional devices can be found inBGPIMPLS IP VPNAccess to multiple applicationsVPNExample, reduce the investment of user network equipment
MCEandPEThere must be multiple physical links betweenVPINIsolation between instance
as shown below :
R3andR1ofIS-LevelMismatch
R3andR1different area codes
R3andR1ofIIHAuthentication failed
R3andR1ofSystem
MPLS is called Multi-Protocol Label Switching. Regarding the label description in MPLS, the correct one is:
MPLSThe system has a variety of label publishing protocols, such asLDPis a label publishing agreement
Labeled byMIPLSheader of messageBIt has global significance, that is, the label values of all routers cannot be repeated
A label is a fixed-length identifier with only local significance, which is used to uniquely identify
the group to which a group belongs.FEC
MPLSSupports single-layer labels as well as multi-layer labels
Which of the following statements about LDP Label Retention - Free Way is true
Requires more memory and tab space
Keep all labels distributed by neighbors
Only keep labels from next-hop neighbors and discard all labels from next-hop neighbors
Save memory and label space
Regarding the description of the encapsulation format of labels in MPLS, the correct one is
MPLSThe total length of a single label is4bytes(32bits)
For Ethernet,PPPpacket, the tag stack is like 'shim*”between the L2 header and the data: yesVLAN tagTime,MPLShead on the ether head withVLAN tagbetween
in the labelSfield:lbit,Used to identify whether the label is the bottom label of the stack, the value is1is indicated as the penultimate layer label
in the labelTTLfields andIPgroupedTTL( Time To Live.,time-to-live) is similar in meaning and also has the effect of preventing loops
The traditional BGP 4 can only manage IPv4 single routing information. In order to provide support for a variety of network layer protocols, MP-BGP extends BG. MP-BGP uses address families to distinguish different network layer protocols. Which of the following address families are currently supported?
BGP-VPNv4address family
BGP-IPV6Unicast address family
BGP-IPV4broadcast address family
BGP-MPexampleIPv6address family
A company consists of a head office and two branch offices, and uses MPLS VPN technology to transmit private network routes. In the networking mode of HuB&Spoke. Branches can only send and receive routes to and from the head office, and branches cannot directly send and receive routes to each other. In order to achieve the above requirements, which of the following schemes can the setting of RT be?
head office:Import Target 12:3; Export Targetr 3:12OBranchl:Import Target,3:12;Export Target
12:3OBranch2:Import Target: 3:12: Export Target: 12:3
head officeImport Target:l:l;Export Target: 3:3OBranchl:Import
Targeta:3:3;Export Target: l:loBranch2:Import Target: 3:3; Export Target:2:2
head office:Import Target 1:1, 2:2;Export Target: 3:3OBranchl:Import Target:3:3;
Export Target: l:loBranch2:ImportTarget:3:3; Export Target:2:2
head office:Import Target: 2:2;Export Target:3:3oBranchl:Import Target:
3:3.Export Target: l:loBranch2:ImportTarget: 3:3; Export Target.2:2
In what ways can log information be viewed:
Network management system interface view
log in to the device viadisplay logbufferCheck
there is no way
Willflash:/logfile/Tlog file viaFIP/TFTPtransfer toPCsuperior
As shown in the figure, private network routing information is exchanged between PE1 and PE2 and their respective CEs through OSPF, and the same DomainID is set on both PE1 and PE2. When routes are imported from BGP to OSPF on PE2, it is possible that Which of the following types of LSAs are passed to CE2?
Type1 LSA
Type3 LSA
Type7 LSA
Type5 LSA
To prevent hackers from attacking user devices or networks through MA, C addresses, you can
Configure the MAC addresses of untrusted users as black hole MAC addresses to filter out illegal MAC addresses.
True
False
Which of the following community attributes can ensure that the propagation scope of BGP routing entries is only within the AS?
No_Export
No_Export_Subconfed
Internet
No_Advertise
A campus has deployed IPv6 for service testing. There are 4 routers (R1, R2, R3 and R4) in this network, running OSPFV3 to realize the interconnection of IPv6 network. A new router R5 needs to be connected to the network for testing. An engineer introduces a direct route in the OSPFVV3 process of R4 so that devices in the campus network can access the GE0/0 port address of R5. Which of the following statements about the scene is true of?
R2 will generate a Type4 LSA only in Area 0 internal flooding
R4 will generate a Type5 LSA describe bow lentered IPv6 routing prefix
R2will generate aType4 LSAdescribeR4ofRouter ID
R4will generate aType5 LSAonly inArea 1internal flooding
As shown in the figure, MPLS/BGP IPVPN is deployed on the network. The MP-BGP neighbor relationship is established between PE1 and PE2 through the Loopback0 interface. After the configuration is complete, it is found that CE1 and CE2 cannot learn routes from each other. Run the command to check the error on PE2. The neighbor information is shown in the figure, what is the most likely cause of the problem?
PE1 or PE2 lack of VPN Instance parameter configuration error
PE1 and PE2 not present BGP-VPN4 Enabling neighbors in unicast address family view
PE1 and PE2 between LSP Tunnel not established
PE1 or PE2 with each other CE Misconfigured routing protocol between
You have set IS-IS IPv6 enable under the interface, what is the meaning of this command?
Activate on the interfaceIPv6 IS-ISprocess1
Activate on the interfaceIPv6 IS-ISprocess3
activate on the interfaceIPv6 IS-ISprocess10
. activate on the interfaceIPv6 IS-ISprocess2
The ORF function of BGP can control the routing entries sent by neighbors. In order to achieve this purpose, the BGP router will send the list of routes to be filtered to the neighbors. Which tool is generally used to send the list to the neighbors?
A. A, CL
B. Filter-Policy
C. IP Prefix List
D. Route-Policy
Which of the following is not a hardware preparation for cutover?
A. Test the operation of the board
B. Power-on test
C. Device version check
D. Cable Continuity Test
By default, which of the following types of secure MA, C addresses will be lost when the device restarts?
black holeMA, Caddress
Sticky MA, Caddress
Security DynamicsMA, C IW
Safe staticMA, Caddress
Regarding BGP/MPLS IPVPN data forwarding, which of the following descriptions is wrong?
data inB, CP/MPLS IP VPNWhen the backbone network is transmitted, it always carries two layers of labels
The inner label when data is forwarded is defined byMP-BGPdistribute
The outer layer label when data is forwarded can beLDPdistribute
PEsend toCEThe data isIPv4Genuine
If the sticky MA, C function is enabled on an interface, by default, the number of MA, C addresses learned by the interface is as large as few?
15
5
10
1
From this picture, we can judge
R1Zone authentication is configured
R1The device type isLevel-1
R1The device type isLevel-2
R1Routing domain authentication is set
What is the most efficient way to view device alarms through the CLI?
display interface brief
display clock
display alarm
display current-configuration
After the VLAN-based MA, C address flapping detection function is configured, if the MA, C address flaps. The interface can be configured to perform actions according to requirements. Which of the following is NOT a configurable action?
Traffic filtering
send alert
interface blocking
MAC address blocking
During the test phase of the cutover, the criteria to indicate that the test has been completed are:
IPThe configuration view result of the device is normal as the standard
Test that the network service is normal as the standard
The upper-layer application service test carried by the network is normal as the standard
check that the network is running normally as a standard
What is the meaning of display current-configuration I include vlan command?
View eachVLANphysical interface information bound to the
See what's currently createdVLAN
CheckVLANIFinterfaceIPaddress
View all included"VLAN"Configuration of keywords
To speed up the detection of link failures in an IS-IS network, you can associate IS-IS with BFD.
True
False
MPLS-straight is slower than IP forwarding.
True
False
IEIF expands the functions of OSPF by taking advantage of the strong expansibility of OSPF. To enable it to support IPv6 networks, the expanded protocol is called OSPFv3. OSPFv3 is compatible with OSPFv2.
True
False
If the temperature of the device is found to be too high, it can be concluded that the fan has failed
True
False
If the BFD session goes down, the direct link will fail.
True
False
Configure ipv6 preference in IS-IS protocol view. The function of this command is to configure the priority of IPv6 routes generated by IS-Is protocol.
True
False
When deploying BGP/MPLS IPVPN, when two VPNs have a common site, the common site must not use overlapping address space with other sites of the two VPNs.
True
False
Can Huawei equipment perform traffic suppression for Mingbi packets?
Unknown unicast
known unicast
multicast
broadcast
A campus has deployed IPv6 for service testing. There are 4 routers in the network, running 0SPFV3. Interconnection of IPv6 networks. As shown in the figure, an engineer checked the LSDB of R2 and intercepted one of them
Link-LSAs. Which of the following statements is true about the description of this LSA?
A. R2interfaceGEO/O/OThe link-local address force:FE80::2E0;FCFF:FEC, D:4F79
B. produce theLSAThe router isR2
C. ShouldLSAShowR2External routing is not supported, but participatingIPv6route calculation
D. R2interfaceGE0/0/0IPV6address prefix:2001:2343:23::
Configuring DHCP Snooping can be used to prevent imitator attacks, so the configuration process needs to include the following. What are the steps?
enable globalDHCP SnoopingFunction
enable globalDHCPFunction
Configure Interface Trust Status
enable interface orVLanOfDHCP SnoopingFunction
From this picture, we can judge that the weather is:
rainy
sunny
snowy
cloudy
From this picture, we can judge
R1ofGE0/0definitely haveLevel-2ability
R1ofGE0/0/0definitely haveLevel-2ability
R1definitely existsLevel-2ofLSDB
R1have2indivualIS-ISNeighbor
EGP authentication can prevent illegal routers from establishing neighbors with B, CP routers. B, CP authentication can be divided into MD5 Authentication and Keychain authentication, which of the following BGP documents will carry the B, CGP Keychain authentication letter interest? (header carry)
Open
Update
Notice
Keepalive
A router runs OSPF, and the output information is shown in the figure. Which of the following statements is correct?
ShouldLSAis of typeAS-external-LSA
ShouldLSAThe described destination network is10.0.23.0
in the pictureLSAis generated by this router
This device isA, BR
OSPFV2 is an IGP running on an IPv4 network; OSPFV3 is an IGPo running on an IPv6 network. The
The basic working mechanism of OSPFv3 is the same as that of OSPFv2, such as the election of DR and B, DR. An engineer uses 3 routers to test IPv6 services. He wants to realize the interconnection of IPv6 networks by running OSPFv3. Which of the following statements about the election of the network DR is correct?
After the network converges, engineers modify R1 the priority is 100, R2 the priority is 10, R3 Keep the default value. When the network converges again, R1 for DR, R2 for B, DR
After the network converges, a new device is added to the broadcast link R4, R4 the priority is 150. When the network converges again, R4 for DR
After the network converges R1 Power off and restart, when the network converges again, R3 for DR
After the network converges, R1 for DR
Which of the following are advantages of VLAN aggregation?
decreasedIPwaste of address
added availableM LANquantity
Increased addressing flexibility
accomplishSub-VLANIsolation between broadcast domains
In an operator's MPLSVPN network, there are two devices PE1 and PE2 for MPLSVPN data forwarding. PE1 receives a private network route of 172.16.1.0 from the client, and converts it to a VPNv4 route on PE1 and assigns a label of 1027 Released to PE2. The outgoing label of the MPLS LSR-ID of PE2 reaching PE1 is 1025. When a client on PE2 accesses 172.16.1.0, the frame sent by PE2, the inner and outer labels should be a combination of the following 6 options?
outer layer label:1025:inner label:1027
outer layer label:1027:inner label:1027
Layer Label:1027:inner label:1025
Layer Label,1025:inner label:1025
Regarding the sham link, which of the following descriptions is wrong?
sham linkThe coat is twoVPNlinks between instances, eachVPNThere must be one in the instancesham linkthe endpoint address, it must bePEon the routerVPNone in the address space has32bitmaskedLoopbackinterface address
becauseVPNflow is throughMPLSBackbone forwarding,sham linkThe routing cost should be less thanbackdoorroadOSPFrouting cost
sham linkThe endpoint address of theBGPasVPNv4address published. passedsamlikThe route can also be reconfigured withVPNv4The form of routing is introduced toBGP
Sham linkIt can be configured in any area and needs to be manually configured and the local endVPNThe instance must have tosham linkdestination address (peerPEofsham linkendpoint address) routing
What is the Router-ID of OSPFv3?
100bit value
128bit value
32bit value
64bit value
Which of the following BGP routing attributes cannot control BGP routing?
MED
AS Path
Community
Originator ID
Part of the configuration of R1 is as follows. Which statement about IS-IS on R1 is correct?
3vpn-instarwce rr
level- 2
cost-style wide
-erntity 47.ccOa 3eft)btxlci-dael
process2with process3The routing information is isolated
process1Contains only global routing information
process1Also contains global routing information. andVRFtt,rrrouting information
process2with process3routing information will be shared
Which of the following are documents that need to be handed over as part of the wrap-up of a structured network troubleshooting process files?
Maintenance suggestions to avoid this fault
Troubleshooting Summary Report
Troubleshooting Procedure Doc
Troubleshooting Summary Report
ping -a Xc Ys z -vpn-instance M 10.5.16.2, the meaning of this command is:
ShouldpingsendYindividualICMPask
ShouldpingofICMPThe request packet size isZ(excludingIPandICMPhead)
Shouldpingpackage sourceIPaddress isX
Shouldpingpackage belongs toVPNexampleM
from this figure, it can be known that
R1 access 172.1.7.1.5 there is a loop
R1 have access 172.17.1.5 routing
R1 no access 172.17.1.5 routing
R1 access 172.17.1.5 there is no problem with the path
There is the concept of forwarding equivalence class FEC in MPLS. The following description is wrong:
A. MPLS Grouping packets with the same forwarding processing method is called FEC
B. A forwarding equivalence class FEC A unique label value is assigned on all routers
C. same FEC grouped in MPLS There will be different processing in the network
FECThe division is very flexible. Can be the source address, and the address, source port, destination port, protocol type or VPNEqual to any combination of division basis
As shown in the figure, the MP_BGP neighbor relationship is established between PE1 and PE2 through the Loopback0 interface. After the configuration is complete, it is found that CE1 and CE2 cannot learn routes from each other. Which of the following options will cause this problem?
PE1 or PE2 not present BGP-VPNv4 Enabling neighbors in unicast address family view
PE1 or PE2 AtoFVPNInstance parameter configuration error
PE1 and PE2 between LSP Tunnel not established
PE1 or PE2 with each other CEMisconfigured routing protocol between
As shown in the figure, the network has a loop because STP is not enabled. Which of the following phenomena may be bowed?
Hostreceive a large number of broadcasts
The device will generate a loop alarm
equipmentCPUOccupancy is too high
MAC Address table flapping
In an MPLS VPN network, data packets are forwarded when they enter the public network. will be encapsulated with two layers of MPLS labels sign. Which of the following options describes the processing of the packet correctly
The data packet is forwarded toEgress PEequipment
Egress PEThe device correctly sends the data packet to the correspondingVPNmiddle
the outer label of the packet received by the penultimate hop device is3
Egress PEDevice received untaggedIPdata pack
The rules of RR advertising routes violate the rules of IBGP split horizon, so it may cause loops in the AS
road. Which routing attributes does RR use to prevent loops?
Cluster List
Originator ID
Nexthop
AS-PATH
During the process of viewing the debug input through the SSH terminal, there is a lot of pop-up information. Which of the following operations can make the monitor terminal no longer pop up the debug message?
Open Notepad and enterundo terminal debugging,Copy the command line and paste it intoMonitorinterface
Open Notepad and enterundo debugging all,Copy the command line and paste it intoMonitorinterface
Open Notepad and enterundo terminal monitor,Copy the command line and paste it intoMonitorinterface
exit currentMonitorinterface, re-SSHLog in to the device to open a new oneMonitorinterface
As shown below :
area. have8indivualMAThe internet
area. have4indivualMAThe internet
area. have4router
area. have8router
Which of the following statements about VLAN aggregation is true?
Super-VLANOnly physical interfaces cannot establish Layer 3VLANIFinterface
OneSuper-VLANcan contain one or moreSub-VLAN
Sub-VLANContains physical interfaces. Three layers can be builtVLANIFinterface
Sub-VLANfor isolating broadcast domains
Which of the following sequences can be matched by the regular expression 100.S
100
1000
10000
1001
Part of the configuration of R1 is as follows. Which statement about OSPF on R1 is correct?
ospf 1 router-id 172.16.1.1
area 0.000
network 10.1.12.1 0.0.0.0
network 10.1"3"0.0.0.0
network 172.16 1 0.0.0.0
ospf 2 vpn-instance tt
area QQO.O
network 10J J 1 0.000
VRF ttThe routing information will appear inOSPFprocess1in the routing table
process1and process2ofOSPF LSD8within its areaLSAinconsistent
process1and process2ofOSPF-LSDBits area0InsideLSAexactly the same
VRFttThe routing information will not be available nowOSPFprocess1in the routing table
As shown in the figure, a park has deployedIPv6For business testing, the network has4router. run 0SPFV3Realize network interconnection. about theOSPFV3network generatedLSA. Which of the following statement it's wrong?
R1will produceRouter-LSADescribing the device interface information will be received at the same timeR2andR3produced Router-LSA
R1ofLSDBhaveR3producedNetwork LSA. illustrateR3may be from this linkDR
R1will receiveR2produced2indivualLink-LSA. Describe separatelyR2Information about the two links connected
R2asA, BRWill produceInter-Area-Prefix-LSAdescribeArea 1ofIPv6address prefix, and advertise GiveR1andR3
As shown, all routers run OSPF. Which of the following statements is correct?
R2in the area1and area0will generateRouter LSA
R2WillR3GeneratedRouter LSAforward toR1
R2WillR1GeneratedRouter LSAforward toR3
R2only in area0generated inRouter LSA
According to this figure, which statement is correct about the IPv6 routing information calculated by the R4 router through IS-IS?
day4have1stripIS-ISdefault route
R4have2equivalentIS-ISdefault route
R4have2not equivalentIS-ISdefault route
R4withoutIS-ISrouting entry for
The OSPF protocol is run between CE and PE, when CE1 advertises the route of its site to CE2. Which of the following descriptions is incorrect?
whenPE2receivePE1sentBGRoutedDomain IDcorrect for all when different from localLSA. PE2will generateType5LSAorType7LSA
whenPE2receivePE1sentBGRoutedDomain IDwhen the same as local, forType1LSAandType2LSA. PE2will generateType3LSA
whenPE2receivePE1sentBGRoutedDomain IDSame as local forType3LSA. PE2will generateType5LSA
PE1configuredDomain IDcan be used asBGPTthe extended community attribute of is sent with the route toPE2
In the process of establishing an LDP session, the active party will first send Initialization information to negotiate parameters. If the passive party does not accept the negotiated parameters, it will send it
Keepalive Message
Initialization Message
Hello Message
Error Notification Message
What is the purpose of configuring LSP fragmentation on an IS-IS device?
make the device unbuildableIS-ISNeighbor
enable the device to support moreIS-ISrouting entry
make the device unable to learnIS-ISrouting information
no real purpose
The Router LSA of a router is shown in the figure. Which of the following statements is wrong?
A. of this routerRouter IDfor10.0.12.1
B. This router isDR
C. This router has established an adjacency relationship
D. This router supports external route import
Which of the following statements about IPSG is false?
IPSG can prevent IP address spoofing attack
IPSG is a source based on a three-layer interface IP address filtering technology
IPSG can be turned on IP packet inspection alarm function, linked with the network management to alarm
able to pass IPSG Prevent the host from changing privately IP address
Match the alarm severity to the severity of the fault and countermeasures
A. Critical-1, Major-3 Minor-2. Warning-4
B. Critical-4, Major-2, Minor-1, Warning-3
C. Critical, Major-2, Minor-3, Warning-4 A
D. Critical-3, Major-2, Minor-1, Warning-4
If display current-configuration can reach the setting of IIS-IS, and display saved-There is no IS-IS setting in the configuration, so that means?
FlashRunningIS-ISconfiguration, not saved to memory
memory is runningIS-ISConfiguration saved toFlash
nothing enteredIS-ISThe command
memory is runningIS-ISconfiguration, not saved toFlash
As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to implement network interoperability. R2, R3, and R4 in branch 2 deploy IS-IS to implement network interoperability. Now the engineer wants to implement R1 to access the loopback interface address of R4. Which of the following operations can meet this requirement?
existR2ofOSFFprocess neutralizationIS-ISDuring the process, the default route is advertised separately
No configuration required
only atR2ofIS-ISDuring the process, the default route is advertised
only atR2ofOSPFDuring the process, the default route is advertised
The IS-IS Level-1 neighbor relationship between R3 and R4 is not established. According to the information in this figure, what is the possible reason?
R3 and R4 the interconnect interface circuit-type Mismatch
R3 and R4 different area codes
R3 and R4 off IS-Level Mismatch
R3 and R1 off IIH Authentication failed
SFFv2 is an IGP running on an IPv4 network; OSPFV3 is an IGP running on an IPv6 network. Compared with OSPFV2, SPFV3 has a similar LSA type, but has slightly different functions. Which of the following is not included in the LSA type of OSPFV3?
A. AS-External-LSA
B. Router-LSA
C. ASBR-Summary-LSA
D. Network-LSA
What is the meaning of ipv6 enable topology ipv6 in IS-IS protocol view?
A. SPFCalculated atIPv4,IPv6in the topology of the
B. has no meaning
C. not supportIPv6ofSPFcalculate
D. IPv4,IPv6use the same topologySPFcalculate
The following six tools cannot be used to match BGP routing entries?
Community Filter
advanced ACL
Basic ACL
IP Prefix list
Please pair the following DHCP attack types with corresponding explanations.
A. DHCPstarvation attack-3 DHCPphishing attack man-in-the-middle attack-2 DHCPpacket flood attack-4
B. DHCPstarvation attack-2 DHCPphishing attack-3man-in-the-middle attack-1 DHCPpacket flood attack-4
C. DHCPstarvation attack-1 DHCPphishing attack-3man-in-the-middle attack-2 DHCPpacket flood attack-4
D. DHCPstarvation attack-4 DHCPphishing attack-3man-in-the-middle attack-2 DHCPpacket flood attack-1
What check items can be set by IPSG?
MAC address
Outgoing interface
VLAN ID
IP address
According to this picture, Xinmen can be judged as which of the following?
R1access172.16.1.4.need to go through2hop router
R1access172.16.1.4,need to go through4hop router
R1access172.16.1.4have2an equivalent path
R1access172.16.1.4have4an equivalent path
After the cutover acceptance is complete, what work still needs to be performed in the closing stage?
Transfer training
data transfer
Acceptance summary
field defense
After the cutover is complete, it is generally necessary to check the following items:
Software version
Physical topology
data flow
aontrol plane entry
The cutover risk assessment mainly considers which of the following aspects?
loss from risk
Scope of Risk Impact
time of risk
Location of key risk points
Ethernet is a broadcast-enabled network, and once there are loops in the network, this simple factory broadcast mechanism can have disastrous consequences. Which of the following phenomena may be caused by loops?
CPUOccupancy exceeds70%
The device cannot log in remotely
use on devicedisplay interfaceWhen commanding to view interface statistics, it is found that the interface receives a large number of broadcast packets
pass throughpingSerious packet loss during network test with command
In OSPF, the A, BR will convert all type 7 L SAs in the NSSA area to type 5 L SAs.
True
False
In an MPLS domain, LSR can be divided into Ingress LSR, Transit LSR and Egress LSR according to the different processing methods of LSRs for data. For the same FEC, a certain LSR can be the Ingress LSR of the FEC or the Transit LSR of the FEC.
True
False
After reset isis all is executed, the IS-IS protocol process needs to be restarted and neighbors need to be re-established, but various IS-IS statistics will not be cleared.
True
False
Regarding the MPLS forwarding process, the description of Ingress node forwarding is correct:
A. Ingress: After the node receives the data packet, it will first check ILM looking for Tunnel ID
B. existIP: The obtained label is pressed into the packet, and according to the QoS Policy processing, EXR: Simultaneous processing, then the packaged MPLS the packet is sent to the next hop
C. according to ILM table Tunnel ID: find the corresponding NHLFE entry, will FIB entry and NHLFE table entry
D. Check NHLFE table entry, you can get outbound interface, next hop, outbound label and label operation type. The label operation type is Push
What is the value of the linkage between OSPF and BFD?
OSPFhelloThe sending interval is in seconds, more thanBFDInduction link status is fast
BFDThe message sending interval can reach the millisecond level, which is less thanOSPFInduction link status is slow
Detected at the millisecond levelBFD. associationOSPFstate, fulfilledOSPFThe purpose of quickly sensing the status of the tank
BFDAny change in state will not affectOSPFneighbor state
Which of the following statements about 1S-IS (IPv6) is true?
to supportIPv6Processing and counting of routesBJS-ISexist129 TLVadded inNLPID
IS-ISWorking at the data link layer only needs to add newTLVready to supportIPv6
to supportIPv6Processing and calculation of routesIS-ISnewly addedTLV232236
by defaultIS-ISTurn on the multi-topology feature
In intra-domain MPLS VPN networks, data packets will be encapsulated with two layers of MPLS when they enter the public network and are forwarded. Label, a description of the two-layer label in the following options. What is wrong is:
A. MPLS VPNThe outer label is made byLDPprotocol or statically assigneD. the inner label is assigned by the correct end MP-BGPassed by neighbors
B. By default, the outer label is popped before the packet is forwarded to the last hop device
C. MPLS VPNThe outer layer is labeled as a private network label, and the inner layer label is called a public network label.
D. Layer labels are used inPETthe device sends the packet correctly to the correspondingVPNmiddle
Which of the following statements is false when troubleshooting the dual-active failure of a VRRP backup group?
No need to check deliveryVRRPWhether the switch port of the advertisement message is in the sameVLAN
need to check the interfaceVRRPGroupIDIs it the same
Interface needs to be checkedIPWhether the address is in the same network segment
need to checkVRRPgroup of virtualIPIs the address the same
When a fault occurs, the fault can be classified to reduce the scope of fault location. Which of the following is not an interface configuration fault?
Inconsistent duplex modes of interfaces on both ends
IPaddress conflict
Interface authentication is inconsistent
Inconsistent luminous power at both ends
Regarding MP-BGP, which of the following descriptions is wrong?
PEandCEpass betweenBGPWhen interactive routing, you need toCEup for eachVPNinstance creationBGPprocess
MP-BGPthe message type,VPNv4route advertisement strategy and BGPsame
MP-BGPneeds to beVPNv4route assignment private network label
MP-BGPpass throughMP_REA, CH_NLRlandMP_UREA, CH_NLRItwo properties to advertiseVPNv4routing
Which of the following is the least likely cause of a VRRP backup group dual-active failure?
A. transmissionVRRPLink failure of advertisement message
B. low priorityVRRPThe backup group will receiveVRRPAnnounce packets are discarded as illegal packets
C. both endsVRRPbackup groupIDdifferent
D. Master EquipmentIsend in seconds1announcement message
In the process of viewing the debug output through the SSH terminal, a lot of information pops up. Which of the following operations can make the Monitor terminal no longer pop up debug messages?
exit currentMonitorinterface redesignSSHLog in to the device to open a new oneMonitorinterface
Open Notepad and enterundo debugging a 11,Copy the command line and paste it intoMonitorinterface
Open NotepadSSlIAundo terminal monitor,Copy the command line and paste it intoMonitorinterface
open notepad inputundo terminal debugging,Copy the command line and paste it intoMonitorinterface
Which of the following statements is true about the role of ping and tracert?
Pingthrough one-wayicmp echo requestPacket inspection and bidirectional reachability of the correct end
Tracer tMust be able to trace every hop from source to destinationIPAddress
pingThe reachability from the local end to the peer end is verified. but it does not mean that the peer end to the local end must be reachable
tracertandpingThe function is the same, just the name is different
Regarding BGP/MPLS IPVPN routing interaction, which of the following descriptions is wrong?
ExportPEable to passBGP,IGPfor static routing to the remoteCEsendIPv4routing
ExportPEupon receiving the entrancePEpostedVPNv4After routing, according to the route carriedRTproperty, yes VPNv4route to filter
PEandCEthe interaction isIPv4routing information
EntrancePEwill be fromCEreceivedIPv4route becomesVPNv4routing, and vary according toVPNsave the instance
Which of the following options is incorrect:
Created by assigning labels staticallyLSPIt can also be dynamically adjusted according to changes in network topology, without administrator intervention.
The principle to be followed when manually assigning labels is: the value of the outgoing label of the upstream node is the value of the incoming label of the downstream node
LSPstaticLSPand dynamicLSPtwo kinds. staticLSPManual configuration by administrator, dynamicLSPthen use Dynamic establishment of label protocol
dynamicLSPDynamically established through the label publishing protocol, such asMP-BGP, RSVPT, LDP
According to this figure, it can be known that in VLAN 300, from 17:22:38 to 17:22.44,00e0-fc3d- 3bdB. 0 MA, C flaps occurred on 2020-06-04
5
65535
300
1
The default MPLS label publishing mode, label distribution control mode and label retention mode of Huawei routers are respectively
Label release method - downstream autonomous method. label distribution control method - free method. label retention method - independent
Label release method - free method. label distribution control method - independent method.label retention method - downstream autonomous method
Label release method - downstream autonomous methoD. label distribution control method - independent methoD. label retention method - free method
Label release method-independent methoD. label distribution control method-free methoD. label retention method-downstream autonomy
OSPFV2 is an IGP running on an IPv4 network; OSPFvV3 is an ICPO running on an IPv6 network the packet types of OSPFV3 and OSPFV2 are the same, including Hall. message, DD message, LSU message, LSU packets and SAck packets. Which of the following statements is correct about OSPFV3 packets?
OSPFV3Complete packet authentication using the authentication field in the packet header
OSPFV3The link-local address is used as the source address of the sent packet, and the packet can be forwarded outside the range of the originating link
OSPFV3useIPv6multicast addressFF02::5heheFF02::6sendOSPFv3message
OSPFV3ofHelloThe packet carries the router interfaceIPv6address prefix list
Qing technology is a technology to expand VLAN space. It can achieve the function of expanding Vian space by adding a layer of 8D2.1Q Tag on the basis of 8Q2.1q tag message. Which of the following statements about qinq is false?
flexibleQinQAccording to different inner layersTagwith different outer layersTag,correct to the userVLANTthe division is more detailed
QinQMakeVLANincreasedto4095*4095
QinQtechnology enables private networksLANTransparent transmission on the public network
basicQinQbased on the interface
The partial configuration of R1 is as follows. Which statement about OSPF on R1 is correct?
Given the following configuration:
ospf 1 router-id 172.16.1 J
area 0.0.0.0
network 10.1.12.1 0.0.0.0
network 10.1.13.1 0Q0.O
network 172 J 6.1.1 0.0.0.0
R1The device type isLevel-2
R1The device type could not be determined
R1The device type isLevel-1
R1The device type isLevel-1 -2
When OSPFV2 evolves to OSPFV3, the LSA format and function are exactly the same, but the network layer in the LSA address from IPv4 to IPv6
True
False
Basic QinQ can choose the outer tag encapsulation method according to the business type.
True
False
As shown in the figure, on the R1 router, network administrator A sends the routing entry to R2 through the routing policy. After modifying the Local Preference value, you can control the path of traffic leaving the AS100.
Correct
wrong
display interface GEO/0/0 once, and found that the Total Eror count (the total number of error packets at the physical layer of the interface) is not correct. At this time, it can be concluded that the current time and fall has not disappeared.
True
False
In BGP/MPLS IP VPN, the OSPF multi-instance process uses the DN bit to prevent Type5 LSA loops.
True
False
For the same MA, C address, manually configured MA, C entries have higher priority than automatically generated entries.
True
False
The correct description for the configuration on this switch is:
YoujizhDHCPYuEgen server and mouthDHCP relayByKmust be enabled globallyDHCP
forVLAN100interface designationDHCPThe server group isdhcpgroup1
First you need to createDHCPmonth starter group and add to server groupDHCPServer
VANIF100The interface will receive theDHCPmessage, sent to the outside through the relayDHCP Server
From this picture, we can judge
<Redisplay ipv6 routing table protocolTuozhen
Public Routing Table . ISIS
Summary Count 6
ISIS Routing Table's Status : < Active >
Summary Count 6
R1 The type of device is definitely not Level-1a
R1 have strip IS-ISoIPv6 routing
R1 no IS-ISoIPv6 routing
R1 of GigabitEthernet0D must be enabled IS-IS IPv6
As shown in the figure, OSPF is enabled on all the routers. The IP address marked in the figure is the IP address of the loopbackO interface of the device. The LoopbackO of R1 and R2 is advertised in area 1, the LoopbackO of R4 is advertised in area 0, and the LoopbackO of R3 and R5E is advertised in area 0. In area 2, which of the following IP addresses can ping each other?
10.0.2.2 and 10.0.3.3 (Non-backbone area received 3 class received does not count)
10.0.3.3 and 10.0.5.5 (same area kind)
10.0.4.4and10.022 (normal calculation3kind)
10.022and10.0.5.5 (Non-backbone area received3class received does not count)
From this picture, we can judge
If not configured aboutAS_Pashrouting strategy, then3002:-4 must not originate fromAS 65001
R1 does not have 3002:3 and 3002:-4 routing
R1 have 3002:-3 and 3002:-4 routing
If not configured aboutAS_Pashrouting strategy, then3002:4 must have originated fromAS 65001
As shown in the figure, MPLS LSP is set up in the network, and the goal is to establish an LDP session between SWA and SWB
Configured correctly
No global enable requiredMPLS
No need to enable on the portMPLS
two devicesmpls lsr-idcannot be configured the same
Configured on an interface: isis timer hello 5 level-2, which of the following statements is correct?
the interfaceLevel-2ofhelloThe packet sending interval is5s
the interfaceLevel-1andLeva 1-2ofhell. The packet sending interval is3s
the interfaceLevel-2ofCSNPThe packet sending interval
As shown in the figure, OSPF is enabled on all interfaces of the router. Which of the following statements is correct?
R2 in the area0 generated in Type1 LSA contains 10.0.2.2 routing information
R2 in the area0 generated in Type5 LSA contains 10.0.2.2 routing information
R2 in the area0 generated in Type2 LSA contains 10.0.2.2 routing information
R2 in the area0 generated in Type3 LSA contains 10.0.2.2 routing information
The input information of a router is as follows. Which of the following causes the OSPF adjacency cannot be established normally?
Area code does not match
Inconsistent area type
interfaceIPInconsistent address masks
Hell. Inconsistent message sending interval
A campus deploys both IPv4 and IPv6 networks for service testing, and runs IS-IS to realize network interconnection. The IS-IS routing protocol has good scalability and is widely used in the existing network. Which of the following statements is true about IS-IS scalability?
IS-ISuseTLVstructure builds the message so thatIS-ISMore flexibility, flexibility and scalability
forIS-ISIn terms of adding new features, only adding newTLVJust
IS-IS to supportPV6to addTLVcarryPV6Address information
N LPIDYesIS-IS to supportIPv6an addedTLV
What is the LSA whose flooding range is the entire autonomous system in SPFV3?
Link-LSA
As-external-LSA
Inter-Area-Prefix-LSA
Intra-Area-Prefix-LSA
Network administrator A wants to use ACL to match only the four routing entries 1 and 3, 5, 7 in the figure. Ask the network administrator A at least how many ACL rules do you need to configure?
A. 2
B. 1
C. 4
D. 3
What is the default aging time of the MA, C address table of Huawei switches?
300
500
400
5
What is the default aging time of the MAC address table of Huawei switches?
300
500
400
5
Regarding the BGP MPLS IPVPN network architecture, which of the following descriptions is wrong?
The device only needs to have the basic MPLS Forwarding capability, not maintained VPN Related Information
between sites via VPN mutual visits, a site can only belong to 1 individual VPN
In general, the CE device does not perceive VPN existence, and CE Device does not require support MPLS, MP-BGP
BGP/MPLS IP VPN network architecture by CE (Customer Edge), PE (Provider Edge) and P (Provider) consists of three parts, including PE and P is operator equipment, CE Yes BGP/MPLS IP VPN User settings prepare
Deployment in a small and medium-sized network OSPF, When viewing the routing table of a device, it is found that there are only directly connected routes. It is not possible for the operation to cause the fault?
Routing protocol configuration error
Incorrect routing policy configuration
Port address assignment problem
The configured user permissions are too low
What is wrong with this configuration description is:
Huawei]dhcp enable
[Huawei]int e GigabitEthernet 0/0
[Huawei-GigabitEthernet0/0 ]dhcp option82 insert en
[Huawei-GigabitEthernet0/0 ]dhcp snooping enable
[Huawei-GigabitEthernet0/0]dhcp snooping trusted
ifGigabitEthernet0/0received by the interfaceDHCPIn the request message, there is noOption82of SutOptioninformation, the device will generateOption82,and insert it into the message
turn onDHCP Snoopingconfiguration can be used to preventDHCP ServerCounterfeiter Attack
configureGigabitEthernet0/0/1The interface is a trusted interface
turn onDHCP Snoopingconfiguration can be used to preventARPspoofing attack
Network administrator A wants to use the IP Prefix List to match a specific route entry. Which of the following routes will be matched by the IP Prefix List in the figure?
10.0.0.1
10.0.0.0
10.0.2.0
10.0.1.0
Which of the following features affects BGP neighbor establishment?
BGPCertification
BGP GSTM
BGProute filtering
ebgp max hop
What types of Link Types are included in the Router LSA in OSPF?
Vlink
Stub Net
TransNet
-P
Which of the following statements about the OSPFV3 packet format is correct?
HelloPackets no longer carry address informationInterface ID
OSPFversion number from2became3
removedAuthentication,AuthTypefield
HellotelegramoptionNo changes to the field
Network administrator A wants to use the AS-Path Filter to match the routing entries of the BGP routing attribute AS_PATH [100 200 300]. Network administrator A sorts out the four configurations in the figure. Which of the following configurations can satisfy network administrator A's requirements?
EC
WayA
*D
WayB
As shown in the figure, 0SPF is enabled on all interfaces of the router. The cost value of the link is marked in the figure, R2's. LoogbackO is advertised by mouth in area 0, then in In area 1, both R2 and R3 transmit the routing information of 10.0.2.2 in the form of Typae3 LSA.
True
False
Since BGP is an EGP routing protocol, BGP routing policies can only be deployed between EBGP neighbors. The routing policy deployed between IBGP neighbors is invalid.
True
False
In the VLAN aggregation technology, multiple Sub-VLANs are used to isolate wide-open domains, and these Sub-VLANs are aggregated. Synthesizing a logical Super-VLAN, a company divides different departments into different Sub-VLAN because Sub-VL AN not only includes physical connection, but also can establish three-layer VLAN ANIF interface, which can directly carry out three-layer communication with external network
True
False
BGP4+ carries the next hop address of the IPv6 route through the Next Hop attribute in the Update packet. (Moved into Attribute 14)
True
False
The ipv6 enable topology standard has been set in the S-IS protocol view. The meaning of this command is:
Pv4 shares a topology with IPv6.
True
False
When B, CPIMPLS TP VPN is deployed, the OSPF VPN Route Tag (VPN Route Tag) is not transmitted in the extended community attribute of MP-BGP, but the local concept is only meaningful on PE routers that receive MP-BGP routes and generate OSPF LSAs.
True
False
To ensure security, authentication can be configured in the OSPFV3 process area view.
True
False
According to this picture, we can judge?
<Huawei>display ospf Isdb router self-originate OSPF Process 1 with Router ID 10.0.12J Area: 0.0.0.0
Type:Router
Lsid: 10.0.12 J
Adv rtr: 10.0.12.1
Ls age: 312
Len: 36
Options : A, BR E \seq#:80000013
1 chksum : 0xc61c
I Link count: 1
1 * Link ID: 10.0.12.2
I Data : 10.0.12.1
, Link Type: TransNet
. Metric : 1
R1ofsystem IDYesee8c.a0c2.bafl
R1existinglevel", andlevel-1-2Dimensional state information of
R1onlylevel-2link state information
level-2In the network, there are a total of8Tailu Electric
WWhat are the wrong statements about OSPF's Router LSA and Network LSA?
runDSPFThe router must generateNetwork LSA
runOSPFThe router must generateRouter LSA
OSPFmust exist in the networkRouter LSAandNetwork LSA
Network LSA, Carry both topology and routing information
Which of the following statements about MPLS header TTL is correct?
MPLSTcorrect toTTLIs handled in two ways. one isIPmessage is enteringMPLSwhen the network MPLSheadTTLcopyIPTTLValue. The other is at the entranceLERwillMPLSheadTTLsystem-settings for 255
Can prevent infinite loop forwarding of packets
copyIPTTLThe way the value is handled is hiddenMPLSDomainLSRPlayed a role in the safety of the lake
Banned from holding shellsTTLIn the case of,tracertcan see passingMPLSDomainLSR
The description of the MPLS forwarding mechanism is correct
The system automatically allocates al. also known asTunnel ID
whenIPmessage entryMRLSdomain, the first thing to look at isFIBsurface
ifTunnel IDvalue is not0x0,into the normalIPForwarding process
ifTunnel IDvalue is0x0test entryMPLSForwarding process
Engineer Guan used two routers to test IPv6 services. By running the BGP4+ module to communicate with the branch, as shown in Juxin, an engineer captured packets to view the Updte packets sent by R1. Which of the following statements is true about the description of the message information?
This message describes only oneBGPAttribute: Multi-protocol unreachableNLRIattributes
This message describes the current cancellationIPv6routing
The maximum and the preceding length of the routing address described in this packet is:2001:db8:2345::1:1
The next hop address of the route described in this packet is:2001:db8:2345::1:1
Which of the following statements about MUX VLANs are true?
eachGroup VLANmust bind aPrincipal VLAN
Separate VLANscan andMUX VLANall withinVLANcommunication
eachSeparate VLANsmust bind aPrincipal VLAN
Principal VLANcan andMUX VLANall withinVLANcommunication
A network engineer entered the following information when troubleshooting OSPF faults. Based on this, you can judge what causes the adjacency relationship to fail to be established normally?
A. Authentication passwords do not match
B. Inconsistent area type
C. Hell. Inconsistent message sending interval
D. interfaceIPInconsistent address masks
As shown in the figure, Client1 and Client2 act as clients of RR1 and RR2 at the same time, and RR1 and RR2 are in the same cluster. In a Cluster, R introduces 10 routes. It is assumed that the configuration of B, CP is correct. Neighbor relations have been established. Now, how many routing entries exist in the BGP routing table of Client2?
10
20
0
15
As shown in the figure, all interfaces of the router enable DSPF. The cost value of the link is marked in the figure. R2
The LoopbackD interface is advertised in area 1, then the cost of R1 reaching 10.2 is?
200
150
50
100
Which of the following commands can be used to view information about BGP VPNv4 routes and BGP private network routes on PEs of interest?
display bgp routing-table address-family vpnv4
display bgp vpnv4 routing-table
display bgp routing-table ipv4-family vpnv4
display vpnv4 bgp routing-table
There is a concept of forwarding equivalence class (FEC-Forwarding Equivalence Class) in MPLS, so FEC does not Can the allocation be made based on which of the following criteria?
Service type(Class of Service)
Fragment offset (Fragment office)
Application protocol(Application Protocol)
target address(Destination Address)
multiple equal-cost routes may appear. About the IS-IS network , which of the following descriptions is false?
A. When the number of equal-cost routes in the network is greater than the number configured by commands, and these routes have the same priority, the next-hop device is preferredSystem IDLarge routes for load balancing
B. If load sharing is configureD. the traffic will be evenly distributed to each link
C. After configuring equal-cost route priorityJS-ISWhen the device forwards the traffic reaching the destination network segment, it will not adopt the load balancing methoD. but forward the traffic to the next hop with the highest priority
For each route in the equal-cost route, a priority can be specifieD. and the route with higher priority will be preferred. the rest as backup routes
R1 executes the operation ping -a 10.1.1.1 10.5.16.2, what is the meaning of this command?
pingpackage sourceIPAddress isR1any direct interface address of
pingpackage sourceIPAddress isR1direction10.5.16.2the optimalIPThe outgoing interface address of the route, and is not 10.1.1.1
pingpackage sourceIPAddress is10.1.1.1
pingPurpose of the packageIPAddress is10.1.1.1and10.5.16.2
In the network shown in the figure below, to implement a remote LDP session between SWA and SWC, the following law is correct
No need to specify the correct equivalent lsr-id
The configuration in the figure can already be realized
You need to create a remote peer, and then specify the peer's lsr-id
Need to be equipped with a direct connection port to establish TCP connect
The security protection actions that a secure MAC address can perform does not include which of the following?
Protect
Restrict
Shutdown
Remark
The IS-IS neighbor relationship between R3 and R1 is not established. According to the information in this figure, what is the possible reason?
R3 and R1 of III Authentication failed
R3 and R1 of System ID repeat
R3 and R1 of IS-Level Mismatch
R3 and R1 the interconnect interface circuit-type Mismatch
The configuration file of the device. Is the following statement D wrong?
Regardless of whether the device is configured with apricotBPDU Tunnel, neither will be correctMSTPmake an impact
Port connected to user terminal equipmentMSTPWhether it is disabled or configured as an edge port
Check port configuration to confirm enableMSTPWhether the port is enabled with the protocol packet sending command. Such as:bpdu enable
Check if the port is added to the correct oneWLAN
Compared with the OSPFv2 packet header, which fields are added in the OSPFv3 packet header?
IPV6 Auth Type
Link ID
Instance ID
IPV6 Router ID
About the site in the BGP/MPLS IP VPN network architecture. Which of the following descriptions is correct?
in any case, belong to the sameVPNDifferent sites on the
through the sameCETerminals connected to the operator's network may belong to different sites(MCE)
site is a groupIPsystem, a network of hosts cannot be called a site
The two geographically separated networks must belong to different sites
If faced with a complex network failure, and it is estimated that the troubleshooting cannot be completed in a short period of time, and the user urgently needs to restore the availability of the network, then the correct approach is
Tell the user it's not possible
Directly build an alternative network environment without notifying customers
Always try to troubleshoot without informing the user of the current troubleshooting difficulty
Communicate with users whether it is possible to skip the faulty node and build an alternative network environment
LDP messages are exchanged between LSRs running the LDP protocol. LDP messages can be divided into four types according to their functions. Which of the following is not a message type of LDP?
discovery message
announcement message
conversation message
label exchange message
When deploying MPLS/BGP IP VPN, which of the following descriptions is wrong about using BGP to
Exchange routing information between PEs and CEs?
existCE In the case of multi-homing, enableBGP ASThe number substitution function may cause routing loops that can be passed throughBGP SoDpreventVPNIntra-site routing loops
whenPEandCEbetweenBGPWhen exchanging routing information, if twoVPNThe autonomous system the site is in uses the same privateASnumber, can be passed throughASThe number replacement function is to use any specifiedASreplace the received private network route with theASnumber to preventASRoutes are discarded due to duplicate numbers
existHub&Spokescene, whenHub-CEandHub-PEuseIGPTimespoke-PEandSpake-CEcannot makeEBGP
whenPEandCEbetweenBGPWhen exchanging routing information, you do not need toPEperform private network route import on theBGPOperation
What fields are added in Update in order to advertise IPv6 routes in BGP4+?
a new oneNLRItypes of"Pv6_NLR,which carryIPv6 NLRI prefix lengthandIPv6 NLRI prefix
A new path attribute:MP_UNREA, CH_NLRI
A new path attribute:MP_REA, CH_NLRI
a new path attribute:IPv6_REA, CH_NLRI
In the multi-level RR scenario, a large number of secondary RRs will be connected to the primary RR, which may lead to BGP of the primary RR. The routing table overflows, what method can be used to reduce the risk of overflowing the routing table of the advanced RR BGP?
ORF
route aggregation
routing control
set the sameCluster-ID
About the difference between NSR and NSF, which is correct?
NSF can be done without neighbor routers
NSR must rely on neighbor routers to complete
NSF must rely on neighbor routers to complete
NSR and NSF by 6 requires neighbor router to complete
as shown below : IR2] ad 2000
[R2-ad-basic-2000]rule deny
[R2-ad-basic-2000]quit
#[
R2] ospf
[R2-ospf»1]area 1
[R2-ospM-area-0.0.0.1] filter 2000 import
[R2-ospf-1-area-0.0.0,1] quit
[R2-ospf-1] default-route-advertise always
Area2containsType5LSAflood
Area2no insideType3 LSAflood
ArealcontainsType5 LSAflood
Arealno insideType3 LSAflood
When troubleshooting a network, if you need to confirm the business traffic path, which of the following may need to be done?
Confirm data link layer service traffic path
Confirm the network layer service traffic path
Investigate service traffic path planning in the network design phase
Confirm the frequency of failure
The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. The following statement about the Discovery message in the basic discovery mechanism is correct:
TCP After the connection is established
Purpose of the message IP address is multicast IP address 224.0.0.2
This message is encapsulated in UDP. In the message, the destination port number is 646
The message is sent to the specified LDP Peer
Which of the following information can the DHCP binding table contain?
port and UDP port
MAC address
IP address
lease time
Which of the following actions may affect the normal operation of the customer's network?
Device naming
software upgrade
Hardware expansion
Routing Protocol Configuration Changes
According to this picture, cooked I'] can be judged?
R1ofGEO/0/0Interface is not enabledIS-IS IPv6
R1ofGEO/0/interfaceIS-ISThe interface type isLeve-1
R1ofGEO/0/0interfaceIS-ISThe interface type isLevel-1-2
R1ofGEO/0/0interface is enabledIS-IS IPv6
According to this diagram, can we break
system-IDforee8c.a0c2.baf2The device' whose type isLevel-1
system-IDforee8c.a0c2.baf2device whose type isLevel-1-2
R4belong only toLevel-1
R4dry onlyLevel2
Which of the following are static information coke analysis?
Interface Type
Packet loss rate
License
Equipment type
A campus deploys OSPF to implement network interworking. The LSDB of R2 is shown in the figure. From this LSDB, it is possible to
Area1None inType3 LS
Area 1forNSSArea
R2WillType7 LSAThe default route is converted toType5 LSAdefault route for
R2existOSPFThe default route is delivered in the process
The routing policy tools that can be used by BGP mainly include Filterpolicy and oRoute-policy. Filterpolicy can only filter routes, Rote-policy can only modify routes
True
False
A company purchased private lines from two operators. In order to optimize the lines, the company used the 6GP protocol to learn from two route entries that operate off. However, after the enterprise found that this configuration, the traffic of the port route increased greatly, and the network engineering arrangement. After investigation, it was found that the traffic of the two operators was passed to each other through the enterprise egress router. Therefore, the enterprise intends to use the routing strategy so that the traffic of the packets of different carriers is no longer passed to each other. Is the configuration in the following figure correct?
True
False
Senior engineers with rich experience can quickly solve faults only by experience, with high efficiency
TRUE
FALSE
The link status information between different S.4S processes of the routers around the Taiwan and Taiwan is considered to be sound insulation.
True
False
In the absence of a header, the Domain ID of each OSPF process running on the router and the process ID of the process Be consistent and can be modified under the process through the domain-id command
True
False
All routers in a network run IS-IS, and all are in Area 49.0001, where the L SDB of R1 is shown in the figure. According to this, it is judged that the DIS of Level-2 is. (Please fill in the device name, such as R1)
(a)
During the daily troubleshooting process, engineers may need to view some alarm information of the device. Run the terminal command to enable the terminal to display the debugging/log/alarm information sent by the information center.
(a)
Which of the following reasons may cause the hosts in the same VLAN LAN to fail to communicate with each other?
port isolation is configured on the switch
the wrong port is configured on the machine, and MAC address binding
interface is artificialshutdownor the physical interface is damaged
switch MAC address learning errors
What characteristics must a high-risk operation plan have?
with verification
Strong operability
accurate
can return
Ethernet is a network that supports broadcasting, and once there is a loop in the network, this simple broadcasting mechanism can cause catastrophic consequences. Which of the following phenomena may be caused by loops?
The device cannot log in remotely
pass through PING Serious packet loss during network test with command
CPU Occupancy exceeds 70%
use on the device DISPLAY INTERFACE command to view interface statistics, it is found that the interface receives a large number of broadcast message
As shown in the figure, configure a backhaul summary route 10.0.0.0 on the border route RT1. next hop to RT2. At the same time, the default route to the external network is configured. At this point, a routing black hole will appear. The following is about routing Is the black hole statement correct? (multiple choice)
Configuring black hole routing can solve the routing black hole problem
Routing black hole has no impact on the network and can be ignored
Precise routing can always avoid routing black holes
If the terminal in the network sends data packets to the network segment that does not appear on the internal network, a loop will occur
esight uses different colors to distinguish different alarm levels, red represents emergency, orange represents important, and yellow represents The table is secondary, and blue represents the prompt. Which of the following statements about different alarm levels is correct?
Prompt: A potential or imminent business-impacting failure has been detected but currently has little business impact
Minor: There is currently a certain impact on the business, but corrective actions are required to prevent serious failure alarms
Urgent: Alerts that have affected the business and require immediate corrective action
Important: An alarm that has affected the business and will have serious consequences if not handled in time
On the OSPF network shown in the figure, the cost values of links are marked, and OSPF IP FRR is enabled on R1. Which of the following statements are true?
No backup path can be established between R1 and 10.0.3.3.
If S1 is powered off, R1 directly uses the backup path to forward packets to R3.
If BFD (with default detection parameters) is enabled on the entire network and the link between R2 and S1 is disconnected, R1 can quickly detect the OSPF adjacency fault.
If the link between R1 and S1 is disconnected, R1 directly uses the backup path to forward packets to R3.
On the OSPF network shown in the figure, the cost values of links are marked, and OSPF IP FRR is enabled on R1. Which of the following statements is false?
If the link between R1 and SI is disconnected, Rl recalculates the optimal path to R3 and performs path switching instantly
If the link between R2 and SI is disconnected, R1 recalculates the optimal path to R3 and performs path switching instantly
If the link between R1 and SI is disconnected, R1 directly uses the backup path to forward packets to R3 because FRR is enabled on R1
If the link between R1 and SI is disconnected and you check neighbor information on R1, the neighbor relationship between R1 and R2 will instantly display Down
On a stable network that requires fast route convergence, you can change the value of the interval at which OSPF LSAs are updated to 0 so that topology or route changes can be immediately advertised on the network through LSAs, which speeds up route convergence.
TRUE
FALSE
On the ISIS network shown in the figure, R1 imports a default route using the default-route-advertise always level-1 command. In this case, R3 can learn this default route through IS-IS.
TRUE
FALSE
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router. Both Rl and R4 have static routes to 192.168.1.0, which are imported to BGP through the import-route command. R3 is configured with the peer y.y.y.y as-path-filter 1 import command for all peers. Which of the following sets of commands enables R3 to select the route with the longest AS_Path to 192.168.1.0?
ip as-path-filter 1 deny .*6500 ip as-path-filter 1 permit .*
ip as-path-filter 1 deny A65002 ip as-path-filter 1 deny A65005 ip as-path-filter 1 permit .*
ip as-path-filter 1 permit .* ip as-path-filter 1 deny 650015 ip as-path-filter 1 deny A65005
ip as-path-filter 1 deny 650015 ip as-path-filter 1 permit .*
On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The AS number is 6500X, where X is the number of the router. Both R1 and R4 have static routes to 192.168.1.0, which are imported to BGP through the import-route command. By default, in the routing table of R3, which of the following is the AS Path attribute carried in the route to 192.168.1.0?
65002, 65001
65002, 65005, 65004
65006, 65005, 65004
65006, 65005, 65004, 65001
On the network shown in the figure, IS-IS runs on Rl, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. In AS 65000, Ri, R3, R4, and R6 each establish IBGP peer relationships with R2 and R5. R2 and R5 are RRs, and Rl, R4, R3, and R6 are clients. The IBGP peer relationships are established using LoopbackO. The IP address of LoopbackO on each router is 10.0.X.X, and the router ID is 10.0.X.X, where X is the number of the router. Rl and R4 import the external route 192.168.1.0 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0 to BGP through the import-route command. Which of the following statements are true?
A. For 192.168.2.0, R2 preferentially selects the BGP route received from R3.
B. For 192.168.1.0, R3 preferentially selects the BGP route received from R2.
C. For 192.168.2.0, R5 preferentially selects the BGP route received from R3.
D. For 192.168.1.0, R6 preferentially selects the BGP route received from R2.
BGP allows you to use the filter-policy acl-number import command to filter received routes. The value of ad-number ranges from 2000 to 3999.
TRUE
FALSE
To protect a device against the attacks of forged BGP messages, you can configure GTSM to check whether the TTL value in the IP message header is within the specified range. If the peer x.x.x.x validttl-hops 100 command is configured on a device, the valid TTL value range of the detected message is [155, 255].
TRUE
FALSE
On the network shown in the figure, IS-IS runs on R1, R2, R4, and R5, and the area ID is 49.0001. IS-IS runs on R3 and R6, and the area ID is 49.0002. The import-route isis level-2 into level-1 command is configured on R2 and R5. In AS 65000, R1, R3, R4, and R6 each establish IBGP peer relationships with R2 and R5. R2 and R5 are RRs, and R1, R4, R3, and R6 are clients. The IBGP peer relationships are established using Loopback0. The IP address of Loopback0 on each router is 10.0.X.X, and the router ID is 10.0.X.X, where X is the number of the router. R1 and R4 import the external route 192.168.1.0 to BGP through the import-route command, and R3 and R6 import the external route 192.168.2.0 to BGP through the import-route command. Which of the following statements are true?
The routing table of R4 contains two equal-cost default routes.
The route 192.168.2.0 in the routing table of R4 has two different outbound interfaces.
The routing table of R1 contains the route 192.168.2.0.
The routing table of R1 contains two equal-cost default routes.
The figure shows the Router-LSA generated by a router. Which of the following statements are true based on the LSA?
The router is an ASBR.
At least one interface on the router belongs to area 0.
The router is an ABR.
At least one interface on the router belongs to a stub area.
On the OSPFv3 network shown in the figure, OSPFv3 is enabled on the interfaces connecting R1, R2, and R3. The router ID of each router is 10.0.X.X, where X is the number of the router. If you check detailed information about an LSA on R3, the command output shows that the LSA is generated by R2 and describes the IPv6 prefix address associated with the Router-LSA.
FALSE
R1 and R2 use directly connected interfaces to establish an EBGP peer relationship. R1 imports 2000::1 to BGR. By default, which of the following is the next hop of the route from R2 to 2000::1?
2002:12::1
2001:12:1
2003:12::1
2000:12::1
On the OSPFv3 network shown in the figure, area 1 is a common area. Which of the following statements are true?
The LSDBs of R1, R2, and R3 are the same.
If R5 imports an external route, R4 does not need to rely on the Inter-Area-Router-LSA to calculate the external route.
R1, R2, and R3 generate Inter-Area-Prefix-LSAs.
The LSDBs of R4 and R5 are the same.
On the OSPFv3 network shown in the figure, area 1 is a stub area, area 2 is a common area, and area 3 is an NSSA. Which of the following LSAs is displayed only in area 2?
Router-LSA
Link-LSA
Intra-Area-Prefix-LSA
AS-External-LSA
To support the processing and calculation of IPv6 routes, IS-IS adds a new NLPID to TLV 129. The NLPID is an 8-bit field that identifies network layer protocol packets. Which of the following is the NLPID of IPv6?
232
142
204
236
On the OSPFv3 network shown in the figure, each interface of R1 and R2 has two IPv6 addresses. Although the IPv6 address prefixes of R1 and R2 are different, they can still be used to establish an OSPFv3 neighbor relationship. If R2 is the DR, the Intra-Area-Prefix-LSA generated by R2 contains four prefixes.
TRUE
FALSE
On the OSPFv3 network shown in the figure, the IPv6 address of Loopback0 on R3 is 2000-3, and OSPFv3 is enabled. Which of the following statements are true?
A. R2 definitely generates a Link-LSA.
B. The Link-LSA generated by R2 does not exist in the LSDB of R1.
C. R1 definitely generates a Network-LSA.
D. R3 definitely generates an Intra-Area-Prefix-LSA.
Which of the following TLVs is added to IS-IS to support multi-topology?
TLV229
TLV232
TLV236
TLV129
If the display ospfv3 peer verbose command is run to check OSPFv3 neighbor information, the command output contains information such as the peer router ID, global unicast address of the peer interface, and neighbor status.
TRUE
FALSE
On the OSPFv3 network shown in the figure, area 1 is a stub area. Which of the following statements are true?
Default routes exist in the routing tables of R1 and R2
Both R1 and R2 generate Network-LSAs.
Both R1 and R2 generate Inter-Area-Prefix-LSAs
Both R1 and R2 generate Intra-Area-Prefix-LSAs
After basic QinQ is configured on an interface of a switch, the switch adds the default VLAN tag of the interface to packets only when the interface receives tagged packets. In this way, the VLAN space is expanded
TRUE
FALSE
An interface of a switch is in error-down state. A possible cause is that the average rate of broadcast packets received by the interface exceeds the upper threshold set by the administrator for storm control.
TRUE
FALSE
There are multiple types of MAC address entries on a switch. Which of the following entries are manually configured and cannot be aged out?
MUX MAC address entries
Static MAC address entries
Dynamic MAC address entries
Blackhole MAC address entries
After port isolation is configured on a switch, hosts in the same VLAN cannot communicate with each other at Layer 2 or Layer 3 by default.
TRUE
FALSE
IPSG is a source IP address filtering technology based on Layer 3 interfaces. It prevents malicious hosts from forging authorized hosts' IP addresses to access authorized network resources.
TRUE
FALSE
MPLS supports nesting of multiple labels. After receiving an MPLS packet, a device first processes the label next to the Layer 2 header, that is, the top MPLS label.
TRUE
FALSE
The figure shows the LSP information of R1 and R3 on an MPLS network. An administrator runs the ping -a 1.1.1.1 3.3.3.3 command on R1. Given this, which of the following statements is true?
The Echo Request packet received by R2 carries label 1025, and the Echo Reply packet received by R2 does not carry any label.
The Echo Request packet received by R2 carries label 1025, and the Echo Reply packet received by R2 carries label 1024.
Both the Echo Request and Echo Reply packets received by R2 do not carry any label.
The Echo Request packet received by R2 does not carry any label, and the Echo Reply packet received by R2 carries label 1024.
An administrator runs the display mpls Isp command to view LSPs on a device. The command output is shown in the figure. Which of the following statements are true?
Traffic sent from GEO/0 of the device to 3.3.3.3 does not carry any label
For the traffic destined for 3.3.3.3, the device is the penultimate transit device
For the traffic destined for 1.1.1.1, the device is the last hop, that is, the egress device
Traffic sent from GE0/0/0 of the device to 1.1.1.1 carries label 1026
Service routes of an enterprise are transmitted on the network. Some configurations of PE1 and PE2 are shown in the figure. Which of the following LSAs may CE2 receive?
Type 5 LSA
Type 1 LSA
Type 3 LSA
Type 7 LSA
In CE multi-homing scenarios, if BGP AS number substitution is enabled on PEs, you can run the peer soo command on the EBGP peers of the PEs and CE to configure the Site of Origin (SoO) attribute to prevent loops.
TRUE
FALSE
For high reliability purposes, the following LDP messages are transmitted through TCP: discovery messages, session messages, advertisement messages, and notification messages.
TRUE
FALSE
The path that IP packets pass through on an MPLS network is called a label switched path (LSP). An LSP is a bidirectional path that specifies the transmission direction of data flows.
TRUE
FALSE
If end-to-end QoS is configured on an MPLS network, the penultimate hop device on the MPLS network can pop MPLS labels from packets based on penultimate hop popping (PHP), so that the egress node can process packets based on the QoS priority in inner packets.
TRUE
FALSE
On a BGP/MPLS IP VPN network, which of the following are carried when a PE advertises VPNv4 routes?
IPv4 prefix
RD
Export target
Import target
In the hub-spoke networking shown in the figure, the Hub-PE can be configured to allow repetitive local AS numbers for correct route transmission.
True
False
On an MPLS network, after an LSR receives a Hello message from a peer, the LSR establishes an LDP adjacency with the peer. The Hello message is sent in multicast or unicast mode.
TRUE
FALSE
MPLS can carry multiple network protocol services, including unicast IPv4 services, multicast IPv4 services, unicast IPv6 services, and multicast IPv6 services.
TRUE
FALSE
On a BGP/MPLS IP VPN network, VPNv4 routes carry the export RT. Which of the following attributes is used by MP-BGP to carry the export RT?
Extended_Community
MP_REACH_NLRI
Local_Preference
AS Path
The figure shows the debugging information on an OSPF router. Which of the following is the router ID of this router?
A. 10.0.2.2
B. 10.0.12.2
C. 10.0.12.1
D. 10.0.1.1
The device operating environment is crucial for stable device operating, including the equipment room, power supply, and heat dissipation. Maintenance personnel must be on site to maintain the device operating environment.
TRUE
FALSE
The figure shows the file information on R2. When a network engineer runs the dir | exclude 1 command to view the file information, which of the following files will be displayed?
2.cfg
3.dat
4.zip
1.cfg
A network engineer provides a troubleshooting report after rectifying a fault. The actual network is simplified into the one shown in the figure, where R1 and R2 both have OSPF enabled, and function as the gateways of PC1 and PC2, respectively. Given this, which of the following statements is false?
The OSPF routing table of R1 contains a route to 192.168.1.0.
The router LSA generated by R1 contains information with the link ID being 192.168.1.0.
R1 cannot ping 192.168.1.2.
PC1 and PC2 cannot ping each other.
During an attempt to log in to a NetEngine AR6120 through the console port, the network engineer finds that the password is incorrect and the login fails. If a Telnet account can be used to log in to the device and the account has the permission to change the console port password, the network engineer can log in to the device through Telnet to change the console port password.
TRUE
FALSE
On the OSPF network shown in the figure, a network engineer finds that R1 and R2 have the same router ID, and both have imported default routes (with the default-route-advertise always command configured). Given this, which of the following statements is false?
R2 and R4 can establish a neighbor relationship.
R1 and R2 can establish a neighbor relationship.
R1 and R3 can establish a neighbor relationship.
A routing loop may occur between R3 and R4.
On the network shown in the figure, the DHCP server function is enabled on GEO/0/0 of R2, and the address pool is an interface address pool. When GEO/0/0 and GEO/0 of R1 function as DHCP clients, only one interface can obtain an IP address by default
TRUE
FALSE
On the network shown in the figure, VRRP is configured on R1 and R2, and the virtual IP address is 10.0.12.254. After the configuration is complete, the network engineer checks the VRRP status on R1 and R2, and finds that both devices are in the Master state. Which of the following is not a possible cause of this problem?
R1 and R2 have different priorities in the VRRP group.
GE0/0 and GE0/0 of SW1 belong to different VLANs.
The VRIDs configured on R1 and R2 are different.
The virtual IP addresses configured on R1 and R2 are different
On a PIM-SM multicast network, a network engineer finds that multicast clients cannot receive multicast data. Which of the following is not a possible cause of this problem?
The unicast routes from multicast devices to the RP are unavailable.
The downstream interfaces of multicast devices do not receive any (*, G) Join messages.
Downstream interfaces of multicast devices are disabled from forwarding State-Refresh messages.
The RP addresses of multicast devices are different.
As its network scale expands, an enterprise plans to move scattered servers to the same equipment room for unified management. During hardware migration, network engineers do not need to perform device commissioning and therefore do not need to work out a migration solution.
TRUE
FALSE
If technology migration on the network affects the services running on the live network, strictly follow the preset operation process and risk control measures during the implementation of the technology migration project. Generally, this type of project is defined as a migration project. Which of the following operations performed on the live network belongs to a non-migration project?
Changing the mode of importing routes to BGP from network mode to import mode in batches
Modifying the description of router interfaces in batches
Changing the area type of some OSPF routers to the stub area in batches
Changing the levels of IS-IS Level-1-2 routers to Level-1 in batches
A network engineer enters dir on the device to obtain the following file names. Which is most likely to be the version file of the device?
A. V300R022C00SPC100.cc
B. startup_vl.rdb
C. Ca.cer
D. V300R022C00SPC100.cfg
I-SPF and PRC can speed up ISIS route convergence. PRC does not calculate nodes. Instead, it updates routes based on the shortest path tree (SPT) calculated using the SPF algorithm.
TRUE
FALSE
OSPF requires that routers in the same area have the same link state database (LSDB). As the number of routes on the network increases, some routers cannot carry so much routing information due to limited system resources. This state is called database overflow. If the lsdb-overflow-limit number 7 command is run on all routers on an OSPF network, which of the following conditions are likely to cause routers to enter the overflow state?
The number of Type 4 LSAs exceeds 7.
The number of Type 5 LSAs exceeds 7.
The number of Type 7 LSAs exceeds 7.
The number of Type 3 LSAs exceeds 7.
On a broadcast network, routers (including non-DIS routers) of the same level on a network segment can establish neighbor relationships. In the implementation of BFD for IS-IS, however, BFD sessions are established only between a DIS and non-DIS routers, not between non-DIS routers.
TRUE
FALSE
BFD for OSPF refers to the association of BFD with OSPF to speed up OSPF's response to network topology changes. The OSPF neighbor relationship can enter the Full state only after the BFD session goes up. The OSPF neighbor relationship can go down only after the BFD session goes down.
TRUE
FALSE
On the OSPF network shown in the figure, area 1 is a stub area, area 2 is a totally stub area, and area 3 is an NSSA. Which of the following LSAs does not exist in areas 1, 2, and 3?
Type 2
Type 4
Type 1
Type 3
On the network shown in the figure, OSPF is deployed on R1 and R2. IS-IS is deployed on R2 and R3. To enable R1 to obtain the route to 10.0.3.3, ISIS routes are imported into OSPF on R2. In this case, the next hop address to 10.0.3.3 in the routing table of R1 is (a)
In the absence of a header, the LDP adjacencies will trigger the establishment of LSPO based on the IP routing of the 32-bit address.
True
False