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WorksheetsH3CSE Post-Test
Total questions: 120
Worksheet time: 6hrs 0mins
Which of the following are the layers of the hierarchical network model?
Distribution layer
Campus network core layer
Core layer
Access layer
Which of the following are the modules of the H3C modular network architecture?
Disaster recovery
VPN access
Server farm
WAN distribution
Common designs for the core layer of a large-sized LAN include
Single-core
Dual-core
Multi-node ring
Full mesh
Which of these technologies can implement redundancy in large-sized networks?
VRRP
MSTP
SMart Link
Dynamic Routing Protocol
Which of the following redundancy protocols is most suitable for a dual-homed network?
STP
RRPP
Smart Link
VRRP
IRF provides link and node redundancy.
True
False
IEEE 802.10 inserts a VLAN tag .... in the Ethernet frame header.
Before the source MAC field
After the source MAC field
Before the destination MAC field
After the destination MAC field
The Tag Control Information (TCl) field comprises the following elements:
TPID
Priority
CFI
VLAN ID
Which of the following statements are TRUE about the PVID
The PVID of an access port is the VLAN that it belongs to, and is not configurable.
Atrunk or hybrid port allows multiple VLANs, and you can set the PVID of a trunk or hybrid port.
After you use the undo vian command to delete the VLAN that an access port is in, the PVID of the access port changes to VLAN 1.
After you use the undo vlan command to delete a VLAN which is the default VLAN of a hybrid or trunk port, the default VLAN of the port does not change.
Which of the following statements are TRUE about a trunk port?
The trunk ports of a switch can connect only to switches.
A trunk port does not change the VLAN tag of any incoming VLAN tagged frame.
A trunk port always sends a frame out with its VLAN tag unchanged, regardless of whether the VLAN ID of the frame is the same as the PVID of the trunk port or not.
To change a trunk port into a hybrid port, you must configure the port as an access port first.
Which of the following statements are TRUE about Private VLANs ?
The Private VLAN function is implemented by using hybrid ports and the shared VLAN learning mechanism.
Secondary VLANs are isolated at Layer 2, and cannot communicate with one another.
Secondary VLANs are isolated at Layer 3, and cannot communicate with one another.
The shared VLAN mechanism refers to synchronizing the MAC address entries from the secondary VLANs to the Private VLAN, with the outgoing port unchanged.
Which of the following scenarios is local proxy ARP suitable for?
Two PCs in the same VLAN but isolated by port isolation require Layer 3 communication.
Hosts on the same IP subnet but connected to different Layer 3 interfaces requireLayer 3 communicate.
Hosts in different sub-VLANs of a super VLAN require Layer 3 communication.
Hosts in different secondary VLANs of an Private VLAN require Layer 3 communication.
Why do Layer-3 switches replace routers to implement inter-VLAN routing?
In the single-arm routing method that implements inter-VLAN routing through a router, packets are delayed due to the round trip time on the trunk link.
Routers are more expensive than switches.
Most low-end and mid-range routers use software to forward packets, and thus have low speed, causing bottlenecks.
Layer-3 switches use hardware to forward packets, thus have large throughput and high speed, and avoid delay and instability brought by using external links.
Which parts are involved in Layer-3 forwarding on a Layer-3 switch?
Routing protocols
Platform software protocol stack
Hardware
Driver code
STP port roles include:
Root port
Designated port
Backup port
Alternate port
In spanning tree calculation, the priority vector includes ...
Root ID
Root Path Cost
Forwarding Delay
Bridge ID
Port ID
What are the differences between RSTP and STP
RSTP has less port states
RSTP has more port roles
They use different BPDU formats and sending modes
RSTP delivers rapid convergence upon topclogy changes
RSTP mechanisms include ?
Edge port mechanism
Root port rapid convergence mechanism
Designated port rapid convergence mechanism
Backup port rapid convergence mechanism
Which of the following statements about MSTP is correct?
MSTP generates multiple spanning trees based on instances.
An instance can contain one or more VLANs, and each VLAN can map only to one instance.
MSTP implement load sharing for traffic among instances.
MSTP is defined in IEEE 802.1s.
Which of the following parameters do the switches in the same MST region have?
Region name
Revision level
VLAN-to-instance mappings
Switch name
The STP protection mechanisms include ?
BPDU guard
Root guard
Loop guard
TC BPDU guard
Which of the following statements about BPDU guard are correct?
An edge port transitions to a non-edge port when it receives a BPDU.
BPDU guard is configured in port view.
BPDU guard is configured in system view.
With BPDU guard enabled, edge ports are shut down when a BPDU is received.
Which of the following about high availability is true?
The availability of a product refers to the capability to implement specific functions in specific time under certain conditions.
A higher availability means a longer time for a product to operate normally.
MTBF means “Mean Time Between Failures.
High availability is MTBF/MTTR.
The high availability design of a campus network mainly focuses on:
Device price
Stacking technology
Device redundancy
Link redundancy
Which of the following statements about link aggregation is correct?
Link aggregation combines multiple physical Ethemet ports into one logical aggregation group.
The upper layer entities of the link aggregation service consider the physical links in the same aggregation group as one logical link.
Link aggregation allows you to increase bandwidth by distributing traffic across the member ports in a single aggregation group.
The member ports in the same aggregation group cannot dynamically back up each other.
Which of the following configurations does not participate in operational key calculations?
GVRP
MSTP
QinQ configuration
VLAN configuration
Which of the following technologies can remove network loops on a dual-homed network?
STP
RRPP
Trunk
Smart Link
The features of Smart Link include:
Dedicated to dual uplink networks
Subsecond convergence
Easy to configure
Can be used with STP
RRPP stands for :
Fast Ring Protect Protocol
Rapid Ring Protect Protocol
Fast Ring Protection Protocol
Rapid Ring Protection Protocol
Each device on an RRPP ring is referred to as a node. The role of a node can be:
Masternode
Slavenode
Edgenode
Assistant-edgenode
The VRID of a VRRP group can be configured as ...
0
1
255
256
The authentication modes supported by VRRP include
No authentication
Simple text authentication
MDS5 authentication
SHA authentication
IRF fabric management inloves ?
Topology collection
Topology election
Master election
IRF fabric maintenance
Which of the following are true about an IRF fabric that comprises distributed chassis switches ?
The AMB of the master is the AMB of the IRF fabric
The SMB of the master is one of the SMBs of the IRF Fabric
The AMB of a slave si the AMB of the IRF fabric
The SMBs of the slaves are the SMBs of the IRF fabric
Which of the following statements about SPT are correct?
In an SPT, the path from the multicast source to each receiver is the optimal.
In an SPT, each router maintains an (*, G) entry.
In an SPT, each router maintains an (S, G) entry.
Different multicast sources have independent SPTs rooted at themselves.
Which of the following statements about RPT are correct?
Building of a RPT is initiated by receivers.
In an RPT, each router maintains (*, G) entries.
in an RPT, each router maintains (S, G) entries.
The multicast sources send multicast data to their receivers. The RPs receive the multicast data and forward the data to the receivers.
Which of the following statements about multicast protocol classification are correct?
Multicast protocols fall into dense mode and parse mode.
Multicast routing protocols can be divided into intra-domain and inter-domain protocols.
Intra-domain multicast protocols include DVMRP, MOSPF, and PIM.
MSDP is an inter-domain multicast routing protocol.
The mechanisms used in PIM-DM include:
Flood-and-prune mechanism
Graft mechanism
Assert mechanism
State refresh mechanism
Which of the following tasks must be completed before you perform Layer 3 multicast configuration?
Enter IGMP view
Specify the IGMP version
Configure the PIM protocol
Enable multicast routing globally by using the multicast routing command
Which of the following statements about PIM are true?
To configure PIM-DM, you only need to enable PIM-DM in interface view
To configure PIM-SM, you need to enable PIM-SM and finish RP-related and C-BSR-related configurations. If it is required to specify a device as the DR of a sharednetwork segment, you also need to configure the priority for DR election.
You can configure PIM in VLAN view.
You can configure PIM in VLAN interface view.
What does network security mean?
Make sure users can access network resources at will.
Ensure the security of the internal LAN.
Block illegal access to the internal LAN.
Ensure the security of data exchanged between the intemal network andexternal network.
Which of the following behaviors are not security threats or hacking behaviors?
Use existing backdoors to obtain network administrators’ passwords.
Log in to your own computer to change data.
Use electronic eavesdropping technologies to obtain the passwords of key departments.
Use software tools to attack network devices.
Which of the following access services does AAA support?
FTP
Telnet
PPP
Portal
RADIUS is based on (....), and TACACS + is based on (....).
IP
TCP
UDP
802.1X
Which of the following are 802.1X entities?
Client
Device
Terminal
Authentication server
MAC authentication does not require any client software. However, the user must input the username and password to trigger MAC authentication.
True
False
Which of the following are supported by EAD fast deployment?
Before 802.1X authentication, users can access specific subnets.
Users failing 802.1X authentication can access specific subnets.
Before a user passes 802.1X authentication, the user's HTTP requests are redirected to a specified URL.
When a user passes 802.1X authentication, the user's HTTP requests are redirected to a specified URL.
Which of the following is a portal authentication mode?
Direct authentication
EAP authentication
Re-DHCP authentication
Layer 3 authentication
To configure a device as an SSH server and set the authentication method to publickey, which of the following configurations are required?
Enable the SSH server function.
Generate a local key pair.
Create an SSH user, set the authentication method to publickey, and specify the public key.
Specify the authentication mode and protocol type for the user interfaces.
Which of the following statements about SFTP are not true?
SFTP is a feature in SSH1.
SFTP is the short for secure FTP.
SFTP and SSH are two independent security protocols
You can set the service type to SFTP or all when configuring a user on the SFTP server
What are the major objectives of campus network management and maintenance?
Ensure normal network operation through periodic or real-time monitoring of network devices and terminals
Locate and remove failures
Provide fast responses to new requirements through system upgrade and capacity expansion
Deploy the latest network management system
How to simplify network management and maintenance?
Use unified network management
Use cluster technology
Use IRF technology
Use standard protocols
The basic functions of network management defined by the ISO include
Fault management
Configuration management
Accounting management
Performance management
Which of the following descriptions about SNMP are correct?
SNMPv1 uses community name for authentication.
SNMPv2 adds the features of manager-to-manager communication and bulk information transfer
SNMPv2c uses authentication and encryption
SNMPv3 defines security mechanisms and access control rules
The TLVs that must be contained in an LLDPDU include
Chassis 1D TLV
Port ID TLV
Time to Live TLV
System Name TLV
LLDP operating modes include?
TxRx
Tx
Rx
default
An aggregation part can be used as a source port.
True
False
In remote port mirroring, the ports in the probe VLAN must be disabled from MAC address learning
True
False
The current NTP version is
v0
v1
v2
v3
In symmetric mode, the active peer can synchronize the passive peer and vise versa.
True
False
Which multicast MAC address is the IP address 228.129.129.129 mapped to?
01-00-5E-00-01-01
00-01-5E-11-81-81
01-00-5E-01-81-81
00-01-5E-00-81-81
Which of the following statements are correct about the multicast architecture?
Generally, routers and hosts run multicast routing protocols in between.
Generally, routers run multicast group management protocols in between.
Generally, hosts and routers run multicast group management protocols in between.
The commonly-used inter-domain multicast routing protocol is Multicast Source Discovery Protocol (MSDP).
Which of the following mechanisms are supported by multicast group management protocols?
Join- and leave-group
Multicast group maintenance by router
Querier election
Report suppression
Which of the following messages are supported by IGMPv2?
general query
group-specific query
membership report
leave group message
IP voice deployment includes?
PoE
QoS
Voice packet identification
Digital/analog conversion
Commonly used H3C access control technologies include
802.1X
Portal authentication
MAC authentication
Port security
The default Hold timer of GVRP is?
5 centiseconds
10 centiseconds
20 centiseconds
60 centiseconds
Which field of a received frame does a switch check first?
VLAN attribute
Destination MAC address
Source MAC address
Destination IP address
Source IP address
A spanning tree calculation process includes?
Root bridge election
Root port calculation
Designated port calculation
Alternate port calculation
A typical large-sized LAN comprises the?
Core Layer
Distribution Layer
Access Layer
Network Layer
Which layer is responsible for data/information control based on complex policies?
Distribution layer
Core Layer
Access Layer
The most widely used network devices for a LAN are…
Hubs
Switches
Routers
Servers
Which of the following protocols should be included in the multicast deployment on an IP network?
PIM
RPF
IGMP
GMRP
Which of the following statements are TRUE about MVRP?
MVRP provides a generic framework for devices in a switched LAN to register and de-register attribute values with one other
MVRP is a physical entity
MVRP has four timers: Periodic, Join, Leave and LeaveAll timer
The Multiple VLAN Registration Protocol (MVRP) is an MRP application, used to advertise and learn VLAN configuration for devices
The protocol-based VLAN feature is available only on …. Ports
Access port
Trunk port
Hybrid port
All types of port above
Which tables are contained in the switch hardware for longest prefix match?
MAC address table
L3 Table
ARP Table
DEF_IP table
A spanning tree calculation process includes
Root bridge election
Root port calculation
Designated port calculation
Alternate port calculation
STP limitations include
STP cannot remove loops
STP cannot implement load sharing between VLANs
STP does not provide fast convergence
STP convergence mechanisms are not flexible
The default STP priority of switches is
0
4096
32768
61440
Which of the following
calculation processes is involved in MSTP?
CST calculation
IST calculation
MST calculation
MSTI calculation performed after the IST calculation
Which of the following statements about root guard are correct?
The root bridge is superseded by another bridge upon receiving a higher-priority BPDU
With root guard enabled, ports on the root bridge are set to the listening state and stop forwarding packets upon receiving higher-priority BPDUs
If a port does not receive any higher-priority BPDU when it transitions from the listening state to the forwarding state, the port reverts to the original state
Root guard is configured in port view
Campus network link redundancy technologies include
Link aggregation
Trunk
RRPP
Smart Link
What does LACP stand for?
Link Aggregation Contain Protocol
Link Aggregation Control Protocol
Link Polymerization Contain Protocol
Link Polymerization Control Protocol
Encapsulated by IEEE 802.3, a flush message contains which of the following fields
Destination MAC
Source MAC
Destination IP
Control VLAN ID
The role of a node an an RRPP ring can be?
Primary port
Secondary port
Edgeport
Protected port
VRRP packet types include?
Hello
Init
Authentication
Advertisement
if a joinning switch is using a boot file version different from the master, the switch
Boots normally if the automatic boot file updating function is disabled
Cannot reboot normally if the automatic boot file updating function is disabled
Reboots normally if the automatic boot file updating function is enabled
Cannot Reboot normally if the automatic boot file updating function is enabled
Which of the following statements are correct about multicast models?
In the ASM model, receivers cannot choose multicast sources through multicast group management protocols
In the ASM model, if a receiver wants to receive multicast data from specific sources, the upper layer must work to filter extra data
In the SSM model, receivers can choose both multicast groups and multicast sources
In the SSM model, receivers know the positions of the multicast sources in advance by other means
Which of the following group record types are supported by the report message in IGMPv3 ?
Current status change record
Filtering mode change record
Source list change record
Group change record
Which of the following statements about the multicast distribution tree models are correct?
There are two types of multicast distribution trees: SPT and RPT
An SPT is rooted at the multicast source, and the path from the multicast source to each receiver is the optimal
The RPT is rooted at the RP, and the path from the root to each receiver might not be the optimal
In a RPT, the routers maintain simple entry information, saving the memory spaces
Rules of RP election include?
The C-RP with a higher priority becomes the RP
If there is a tie in priority, the C-RPs perform hash functions and the C-RP with the highest resulting hash value wins
If there is a tie in priority, the C-RPs perform hash functions and the C-RP with the highest resulting hash value wins
If there is a tie in priority, the C-RPs perform hash functions and the C-RP with the highest resulting hash value wins
Which of the following statements about RP and BSR are true?
In PIM-SM, an RP can be manually configured or dynamically elected
To configure dynamic RP election, you can configure the routers that you want to use as the RP as C-RPs. It is a good practice to configure routers in the backbone network as C-RPs
APIM-SM domain can have only one BSR
The BSR is responsible for collecting and advertising RP information in the PIM-SM domain
Which protocols does the AAA framework often use?
RADIUS
PPPOE
802.1X
TACACS+
Which of the following are incorrect about port security?
A port in autoLearn mode changes to secure mode after learning the maximum number of secure MAC addresses
A port in user_ogin mode performs 802.1X authentication on users, and allows only one user to access.
A user that passes MAC authentication on a port in macAddress OrUserLoginSecure can also perform 802.1X authentication
Aport in macAddressElseUserLoginSecure mode performs MAC authentication on 802.1X frames, and if the MAC authentication fails, performs 802.1X authentication on such frames
In portal authentication, Layer 2 authentication mode identifies users by (__); Layer 3 authentication mode identifies users by (___).
User IP address
User MAC address
User IP and MAC addresses
User IP and MAC addresses
Which of the following descriptions about MIB are correct?
AMIB is a tree structure
Each node in a MIB tree is identified by a globally unique name and the numeric labels of the child nodes under the same parent node must be unique too
Only leaf nodes in a MIB are manageable. Leaf nodes are read-only or read-write
Each scalar node in a MIB tree uniquely identifies a managed device and index is not needed to access such nodes
An LLDPDU can contain more than one?
Time to Live TLV
End Of LLDPDU TLV
Port And Protocol VLAN ID
Network Policy TLV
You can configure up to …. Source port
1
2
4
Unlimited
The work modes of NTP include?
Client/server mode
Broadcast mode
Broadcast mode
Symmetric mode
Which of the following are correct about VLAN interfaces on a Layer-3 switch?
You can create the same number of VLAN interfaces as the number of VLANs supported by the switch
VLAN interfaces are virtual interfaces
Each VLAN interface can have only one IP address
Each VLAN interface can be configured with one primary IP address, and multiple secondary IP addresses
The mechanisms used in PIM-SM include?
Join mechanism
Multicast source registration mechanism
Switchover from RPT to SPT
Switchover from RPT to SPT
Common network management features include( )
SNMP
Mirroring
Mirroring
NTP
The MVRP registration mode of a port can be Normal, Fixed, or Forbidden. If you want to configure MVRP registration mode for a port, what the link type of the port must be?
Access
Hybrid
Trunk
Access, Hybrid, or Trunk
Which of the following value must the TPID field take for an 802.1Q tagged Ethernet frame?
0x8000
0x8100
0x8200
0x8300
Available VLAN assignment methods include ( ).
Port-based VLAN assignment
Protocol-based VLAN assignment
IP-based VLAN assignment
IP subnet-based VLAN assignment
Which of the following statements are true about the relationship between a super VLAN and its sub-VLANs ( ).
A super VLAN has only a Layer 3 interface, and it does not contain any physical ports
A super VLAN represents a set of sub-VLANs and provides Layer 3 forwarding services for these sub-VLANs
A sub-VLAN contains only physical ports, and you cannot create a VLAN interface for a sub-VLAN
A super VLAN interface enables Layer 3 communication for its sub-VLANs
A super VLAN interface is UP only if any of its sub-VLAN has an UP physical port
A TCN BPDU is generated when
A port on the bridge transitions to the forwarding state, and the bridge has at least one designated port
A port on the bridge transitions from the forwarding or learning state to the blocking state
A port on the bridge transitions from the listening state to the blocking state
A port on the bridge transitions from the blocking state to the listening state
Which of the following statements about the hello time are correct?
A larger hello time value is superior
A smaller hello time value is superior.
A smaller hello time value is superior
The default value of the heilo time is 2 seconds
Which of the following statements about the edge port are correct?
Edge ports can directly transition to the forwarding state immediately
You can configure a port that connect two switches as an edge port
An edge port transitions to a non-edge port when it receives a BPDU
The edge port does not trigger any topology change when it transitions to the forwarding state
Which of the following statements about the P/A mechanism are correct?
After a one-way handshake with the peer bridge, a designated port rapidly transitions to the forwarding state
The prerequisite of the P/A mechanism is that it must be performed on a point-to-point link
In a synchronization process, a bridge blocks all ports except the edge ports to eliminate possible loops on the bridge
If a designated port receives no Agreement BPDU after it sends out a Proposal BPDU, the port switches to work in STP mode, in which the port waits 30 seconds before transitioning to the forwarding state
Which of the following statements about the MSTP P/A mechanism is correct? (Choose all correct answers.)
The upstream MSTP bridge sends out proposal BPDUs with the proposal and agreement bits set
When receiving the BPDU with both proposal and agreement bits set, the downstream bridge synchronize data and sends back an agreement BPDU
When receiving an agreement BPDU, the designated port of the upstream bridge rapidly transitions to the forwarding state
To implement rapid convergence through the P/A mechanism between an upstream RSTP switch and a downstream MSTP switch, configure No Agreement Check.
Which of the following statements about loop guard are correct?
Congested or unidirectional links may cause loops
The loop guard function enabled on a port takes effect when the BPDU saved by the port ages
If the root port changes to another role, the port transitions to the discarding state, and stops forwarding packets. No loop occurs during the port role changes. The port will be in discarding state until it receives a BPDU and becomes the root port again
This function applies to root, alternate, and backup ports in MSTP
Which of the following statements about TC BPDU guard are correct?
Aswitch flushes its MAC address table entries upon receiving TC BPDUs
With TC BPDU guard, you can set the maximum number of immediate address entry flushes that the switch can perform within 10 seconds after it receives the first TC BPDU
For the TC BPDUs received in excess of the limit, the switch performs an address entry flush only when the timer expires. This prevents frequent flushing of forwarding address entries
TC BPDU guard is configured in system view
Which of the following about device redundancy technologies are correct?
In a campus network, there are many types of faults, and device faults are the most common one
The simplest way to avoid impact of device faults is redundancy design
Device and component redundancy can reduce the impact of device faults on user services to the lowest
All network devices support component redundancy
What is the full name of IRF ?
Intelligent Flexible Framework
Intelligent Resilient Framework
Intelligent Resilient Framework
Intelligent Resilient Framework
Which of the following is true about IRF link anggregation
you can aggregate physical IRF ports for link redundancy
you cannot aggregate physical IRF ports for link redundancy
IRF supports cross-chassis link aggregation
IRF does not support cross-chassis link aggregation
Which of the following statements about IGMP snooping are correct ?
IGMP snooping is a Layer 3 multicast protocol
A router port is a port on a Layer 2 switch that leads toward a Layer 3 multicast device
A member port is a port on a Layer 2 switch that leads toward multicast group members
Upon receiving a report message, the IGMP snooping switch forwards it to all ports in the VLAN except the port receiving the message
Which of the following statements about multicast VLAN are correct?
In traditional multicast programs-on-demand mode, when hosts in different VLANs require the same multicast data, the router needs to forward a separate copy of the data for each user VLAN to the Layer 2 switch
With the multicast VLAN feature, the router only needs to forward the multicast data in the multicast VLAN
IGMP snooping manages router ports in the multicast VLAN
IGMP snooping manages member ports in the sub-VLANs
Which of the following statements about RPF are correct?
The RPF check is based on the source IP addresses of the multicast packets
When performing an RPF check, a router automatically chooses an optimal unicast route to the source IP address of the multicast packet by searching its unicast routing table
For a packet traveling along the SPT from the multicast source to the receivers or the RP, the packet source for RPF check is the multicast source
For a packet traveling along the RPT from the RP to the receivers, the packet source for RPF check is the RP
Which of the following descriptions about PIM-SSM are correct?
SSM is defined in RFC 4607 and the SSM model provides a solution to sourcespecific multicast
PIM-SSM uses neighbor discovery, DR election, and join mechanisms
The neighbor discovery and DR election mechanisms in PIM-SSM are the same as those used in PIM-SM
PIM-SSM must be used with IGMPv3
