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WorksheetsCCNA 2A Final
Total questions: 119
Worksheet time: 20hrs 50mins
M5: Which statement describes STP?
STP is a Layer 2 routing protocol.
STP is a Layer 3 routing protocol for Ethernet LANs.
STP is a Layer 2 loop prevention protocol for Ethernet LANs.
STP is a Layer 3 loop prevention protocol for IP networks.
M5: Without STP on the Ethernet LAN, which three types of frames could cause a catastrophic loop in the network? (Choose three.)
Unicast
Unknown unicast
Multicast
Broadcast
M5: What device is elected by the Spanning Tree Algorithm? All other switches determine a single least-cost path to this device.
root bridge
dedicated bridge
default gateway
default gateway
M5: By default (without any configuration on a switch), what will determine which switch is the root bridge?
The bridge priority
The extended system ID
The MAC address of the switch
The bridge ID
M5: The root bridge will be the switch with the:
Lowest bridge ID
Highest bridge ID
Lowest port priority
Highest port priority
M5: The port closest to the root bridge in terms of least overall cost (best path) to the root bridge is the:
Designated port
Blocked port or non-designated port
Root port
Routed Port
M5: The port on the segment (with two switches) that has the lowest path cost to the root bridge is the:
Designated port
Blocked port or non-designated port
Root port
Routed Port
M5: Which of the following ports will forward Ethernet frames? (Choose two.)
Designated port
Blocked port or non-dedicated port
Root port
M5: The sum of individual port costs along the path from the switch to the root bridge is known as the:
Least cost path
Shortest path cost
Best path cost
Root path cost
M5: How often does a switch send a BPDU?
Every 2 seconds
Every 15 seconds
Every 20 seconds
Only when there is a change in the topology
M5: Which three STP port states are merged into the RSTP discarding port state? (Choose three.)
disabled
blocking
listening
learning
forwarding
M5: Which protocol was designed to bring faster convergence to STP?
PortFast
RSTP
PVST
MSTP
M5: Which technology solves the problem of a device being unable to get an IPv4 address from a DHCP server due to STP forwarding delay timers?
PortFast
BPUD guard
PVST
MSTP
M5: Which port state will switch ports immediately transition to when configured for PortFast?
forwarding
listening
learning
Blocking
M5: After the election of the root bridge has been completed, how will switches find the best paths to the root bridge?
Each switch will analyze the port states of all neighbors and use the designated ports to forward traffic to the root.
Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost.
Each switch will analyze the BID of all neighbors to reach the root and use the path through the lowest BID neighbors.
Each switch will analyze the sum of the hops to reach the root and use the path with the fewest hops.
M5: Which is the default STP operation mode on Cisco Catalyst switches?
PVST+
RSTP
Rapid PVST+
MSTP
MST
M5: What value determines the root bridge when all switches connected by trunk links have default STP configurations?
extended system ID
MAC address
VLAN ID
bridge priority
M5: During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?
All the switches send out BPDUs advertising themselves as the root bridge.
Each switch with a lower root ID than its neighbor will not send BPDUs.
Each switch determines what port to block to prevent a loop from occurring.
Each switch determines the best path to forward traffic.
M5: Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)
edge port
extended system ID
PVST+
bridge ID
PortFast
M5: Which three port states are used by Rapid PVST+? (Choose three.)
discarding
trunking
blocking
forwarding
learning
M5: When PVST is running over a switched network, which port state can participate in BPDU frame forwarding based on BPDUs received, but does not forward data frames?
forwarding
blocking
listening
Disabled
M5: Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?
disabled port
root port
alternate
designated port
M5: Which two statements describe a switch port that is configured with PortFast? (Choose two.)
The switch port should never receive BPDUs.
The switch port immediately transitions from the listening to the forwarding state.
The switch port sends DHCP requests before transitioning to the forwarding state.
The switch port immediately processes any BPDUs before transitioning to the forwarding state.
The switch port immediately transitions from blocking to the forwarding state.
M5: What is one way to correct a spanning tree failure?
Replace all instances of STP with RSTP.
Replace the cables on failed STP links.
Insert redundant links to replace the failed STP links.
Manually remove redundant links in the switched network.
M5: What additional information is contained in the 12-bit extended system ID of a BPDU?
IP address
VLAN ID
port ID
MAC address
M5: An administrator is troubleshooting a switch and wants to verify if it is a root bridge. What command can be used to do this?
show vlan
show running-config
show startup-config
show spanning-tree
M5: What is an accurate description of redundancy?
configuring a router with a complete MAC address database to ensure that all frames can be forwarded to the correct destination
designing a network to use multiple paths between switches to ensure there is no single point of failure
designing a network to use multiple virtual devices to ensure that all traffic uses the best path through the internetwork
configuring a switch with proper security to ensure that all traffic forwarded through an interface is filtered
M6: Which are benefits of EtherChannel technology? (Choose all that apply.)
fault-tolerance
load sharing
increased bandwidth
link redundancy
M6: True or False? FastEthernet and GigabitEthernet links can be combined into a single EtherChannel.
True
False
M6: True or False? PAgP and LACP are both Cisco-proprietary link aggregation protocols.
True
False
M6: Which three are PAgP interface modes? (Choose three.)
on
auto
active
passive
desirable
M6: Which PAgP interface mode will initiate negotiation with other interfaces?
on
desirable
auto
M6: Which combinations of PAgP modes will form an EtherChannel? (Choose all that apply.)
auto > desirable
desirable > on
auto > on
on > on
on > active
M6: An EtherChannel link using LACP was formed between two switches, S1 and S2. While verifying the configuration, which mode combination could be utilized on both switches?
S1-passive and S2-active
S1-on and S2-passive
S1-passive and S2-passive
S1-on and S2-active
M6: When a range of ports is being configured for EtherChannel, which mode will configure PAgP so that it initiates the EtherChannel negotiation?
passive
auto
active
Desirable
M6: Which three interface parameters must match for an EtherChannel to form? (Choose three.)
allowed VLANs
spanning-tree state
native VLAN
trunking mode
EtherChannel mode
M6: What are three advantages of using EtherChannel technology? (Choose three.)
The Spanning Tree Protocol shuts down the unused interfaces in the bundle to avoid loops.
A spanning tree recalculation is not required when a single link within the channel goes down.
Configuration tasks can be done on the EtherChannel interface.
Load balancing is not needed with EtherChannel.
There is no need to upgrade links to faster connections to increase bandwidth.
M6: A network administrator is configuring an EtherChannel link between two physical ports on a switch. Which statement describes the result when one of the physical ports fails?
The EtherChannel stops transmitting data until it is restarted.
The EtherChannel link fails.
An STP recalculation is needed.
The EtherChannel continues transmitting data with reduced bandwidth.
M6: When EtherChannel is implemented, multiple physical interfaces are bundled into which type of logical connection?
loopback
interface range
VLAN interface
port channel
M6: When a range of ports is being configured for EtherChannel by the use of PAgP, which mode will form the bundled channel only if the port receives PAgP packets from another device?
desirable
passive
active
auto
M6: Which two load balancing methods can be implemented with EtherChannel technology? (Choose two.)
destination MAC to source MAC
destination IP to source IP
destination MAC to destination IP
source MAC to destination MAC
source IP to destination IP
M6: Which function is provided by EtherChannel?
spreading traffic across multiple physical WAN links
enabling traffic from multiple VLANs to travel over a single Layer 2 link
dividing the bandwidth of a single link into separate time slots
creating one logical link by using multiple physical links between two LAN switches
M6: Which statement is true about EtherChannel technology?
STP does not run on redundant EtherChannel links.
All configuration tasks must be done on the individual ports in the EtherChannel link.
Links must be upgraded to support EtherChannel.
EtherChannel uses existing switch ports.
M6: Which two mode combinations would result in the successful negotiation of an EtherChannel? (Choose two.)
passive; auto
active; passive
auto; auto
active; on
desirable; desirable
M6: Which two protocols are link aggregation protocols? (Choose two.)
PAgP
RSTP
STP
EtherChannel
802.3ad
M6: When a range of ports is being configured for EtherChannel, which mode will configure LACP so that it initiates the EtherChannel negotiation?
active
passive
desirable
auto
M6: What will happen if a network administrator puts a port that is part of an EtherChannel bundle into a different VLAN than the other ports in that bundle?
The EtherChannel bundle will stay up only if PAgP is used.
The EtherChannel bundle will stay up only if LACP is used.
The EtherChannel bundle will stay up if either PAgP or LACP is used.
The EtherChannel bundle will stay up if the ports were configured with no negotiation between the switches to form the EtherChannel.
The EtherChannel will fail.
M6: When a range of ports is being configured for EtherChannel, which mode will configure LACP on a port only if the port receives LACP packets from another device?
passive
auto
desirable
active
M7: Which message is sent by a DHCPv4 client to initiate the lease obtaining process?
DHCPDISCOVER
DCHPOFFER
DHCPREQUEST
DHCPACK
M7: Which two DHCPv4 messages are sent by the server in the lease obtaining process? (Choose two.)
DHCPDISCOVER
DCHPOFFER
DHCPREQUEST
DHCPACK
M7: Which two DHCPv4 messages are used in the lease renewal process? (Choose two.)
DHCPDISCOVER
DCHPOFFER
DHCPREQUEST
DHCPACK
M7: A DHCP-enabled client PC has just booted. During which two steps will the client PC use broadcast messages when communicating with a DHCP server? (Choose two.)
DHCPACK
DHCPREQUEST
DHCPDISCOVER
DHCPOFFER
DHCPNAK
M7: An administrator issues the commands:
Router(config)# interface g0/1
Router(config-if)# ip address dhcp
What is the administrator trying to achieve?
configuring the router to obtain IP parameters from a DHCPv4 server
configuring the router to resolve IP address conflicts
configuring the router to act as a DHCPv4 server
configuring the router to act as a relay agent
M7: When a client is requesting an initial address lease from a DHCP server, why is the DHCPREQUEST message sent as a broadcast?
The client does not yet know the IP address of the DHCP server that sent the offer.
The client does not have a MAC address assigned yet, so it cannot send a unicast message at Layer 2.
The client may have received offers from multiple servers, and the broadcast serves to implicitly decline those other offers.
The DHCP server may be on a different subnet, so the request must be sent as a broadcast.
M7: Which DHCP IPv4 message contains the following information?
Destination address: 255.255.255.255
Client IPv4 address: 0.0.0.0
Default gateway address: 0.0.0.0
Subnet mask: 0.0.0.0
DHCPACK
DHCPDISCOVER
DHCPOFFER
DHCPREQUEST
M7: What kind of message is sent by a DHCPv4 client requesting an IP address?
DHCPOFFER unicast message
DHCPDISCOVER unicast message
DHCPACK unicast message
DHCPDISCOVER broadcast message
M7: As a DHCPv4 client lease is about to expire, what is the message that the client sends the DHCP server?
DHCPACK
DHCPDISCOVER
DHCPREQUEST
DHCPOFFER
M7: What is the destination IP address when an IPv4 host sends a DHCPDISCOVER message?
224.0.0.1
0.0.0.0
255.255.255.255
192.168.1.1
M7: If more than one DHCP server is available on the local network, in which order will DHCP messages be sent between a host and a DHCP server?
acknowledgment, request, offer, discover
discover, offer, request, acknowledgment
request, discover, offer, acknowledgment
request, acknowledgment, discover, offer
M7: What is the most likely scenario in which the WAN interface of a router would be configured as a DHCP client to be assigned a dynamic IP address from an ISP?
There is a web server for public access on the LAN that is attached to the router.
It is a SOHO or home broadband router.
The router is also the gateway for a LAN.
The router is configured as a DHCP server.
M7: Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period?
dynamic allocation
automatic allocation
manual allocation
Pre-allocation
M7: What is the reason why the DHCPREQUEST message is sent as a broadcast during the DHCPv4 process?
to notify other DHCP servers on the subnet that the IP address was leased
to notify other hosts not to request the same IP address
for routers to fill their routing tables with this new information
for hosts on other subnets to receive the information
M7: How is a DHCPDISCOVER transmitted on a network to reach a DHCP server?
A DHCPDISCOVER message is sent with the broadcast IP address as the destination address.
A DHCPDISCOVER message is sent with the IP address of the DHCP server as the destination address.
A DHCPDISCOVER message is sent with the IP address of the default gateway as the destination address.
A DHCPDISCOVER message is sent with a multicast IP address that all DHCP servers listen to as the destination address.
M7: Which destination IPv4 address does a DHCPv4 client use to send the initial DHCP Discover packet when the client is looking for a DHCP server?
the IP address of the default gateway
224.0.0.1
255.255.255.255
127.0.0.1
M7: Under which two circumstances would a router usually be configured as a DHCPv4 client? (Choose two.)
The router is meant to provide IP addresses to the hosts.
The administrator needs the router to act as a relay agent.
This is an ISP requirement.
The router has a fixed IP address.
The router is intended to be used as a SOHO gateway.
M7: Which address does a DHCPv4 server target when sending a DHCPOFFER message to a client that makes an address request?
client IP address
broadcast MAC address
gateway IP address
client hardware address
M8: Which address type is automatically created by default on a host interface when no RAs are received?
global unicast address
link-local address
MAC address
M8: Which method best describes stateless DHCP?
SLAAC only
SLAAC with stateless DHCPv6 Server
Stateful DHCPv6 Server
M8: Which two ICMPv6 messages are used in the SLAAC process? (Choose two.)
Neighbor Advertisements (NA)
Neighbor Solicitation (NS)
Router Solicitation (RS)
Router Advertisements (RA)
M8: Which command must be configured on a router to enable it to join the IPv6 all-routers multicast address ff02::2?
ip routing
ipv6 unicast-routing
ipv6 address ipv6-address/prefix-length
ipv6 address ipv6-address link-local
M8: What are the flag settings when a host should use the SLAAC only option?
A=1, M=0, O=0
A=1, M=1, O=0
A=1, M=0, O=1
A=0, M=1, O=1
M8: Which ICMPv6 message is sent by a host in an attempt to locate an online IPv6enabled router to obtain IPv6 addressing information?
Neighbor Advertisements (NA)
Neighbor Solicitation (NS)
Router Solicitation (RS)
Router Advertisements (RA)
M8: What method is used by a host to verify an IPv6 address is unique on the local network before assigning that address to an interface?
ARP
DAD
PING
SLAAC
M8: What destination UDP port do DHCPv6 clients use to send DHCPv6 messages?
67
547
68
546
M8: What DHCPv6 message does a host send to look for a DHCPv6 server?
ADVERTISE
SOLICIT
INFORMATION-REQUEST
REQUEST
M8: What DHCPv6 message does a host send to the DHCPv6 server if it is using stateful DHCPv6?
REQUEST
ADVERTISE
SOLICIT
INFORMATION-REQUEST
M8: What flag settings combination is used for stateless DHCP?
A=1, M=0, O=0
A=0, M=1, O=0
A=1, M=0, O=1
A=0, M=1, O=1
M8: What M flag setting indicates that stateful DHCPv6 is used?
M=0
M=1
M8: Which three DHCPv6 roles can a router perform? (Choose all that apply.)
DHCPv6 client
DHCPv6 relay agent
DHCPv6 server
M8: Which command is not configured in stateless DHCPv6?
address prefix ipv6-address/prefiX
domain-name name
dns-server server-address
ipv6 dhcp server pool-name
M8: An IPv6-enabled router is to acquire its IPv6 GUA from another IPv6 router using SLAAC. Which interface configuration command should be configured on the client router?
ipv6 address autoconfig
ipv6 address auto config
ipv6 address dhcp
ipv6 address dhcpv6
M8: A router is to provide DHCPv6 server services. Which command should be configured on the client facing interface?
ipv6 enable
ipv6 dhcp pool POOL-NAME
ipv6 dhcp server POOL-NAME
ipv6 nd other-config-flag
M8: An IPv6-enabled router is to acquire its IPv6 GUA from a DHCPv6 server. Which interface configuration command should be configured on client router?
ipv6 address autoconfig
ipv6 address auto config
ipv6 address dhcp
ipv6 address dhcpv6
M8: Which DHCPv6 verification command would display the link-local and GUA assigned address for each active client?
show ip dhcp pool
show ipv6 dhcp binding
show ipv6 dhcp interface
show ipv6 dhcp pool
M8: Which command is configured on the client LAN interface of the DHCPv6 relay agent?
ip helper-address
ipv6 dhcp relay destination
ipv6 enable
ipv6 helper-address
M8: How does an IPv6 client ensure that it has a unique address after it configures its IPv6 address using the SLAAC allocation method?
It contacts the DHCPv6 server via a special formed ICMPv6 message.
It checks with the IPv6 address database that is hosted by the SLAAC server.
It sends an ARP message with the IPv6 address as the destination IPv6 address.
It sends an ICMPv6 Neighbor Solicitation message with the IPv6 address as the target IPv6 address.
M8: Which method would an IPv6-enabled host using SLAAC employ to learn the address of the default gateway?
neighbor advertisements that are eceived from link neighbors
reply messages that are received from the DHCPv6 server
router advertisements that are received from the link router
advertise messages that are received from the DHCPv6 server
M8: What two methods can be used to generate an interface ID by an IPv6 host that is using SLAAC? (Choose two.)
EUI-64
stateful DHCPv6
ARP
DAD
random generation
M8: A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address?
It must send a DHCPv6 REQUEST message to the DHCPv6 server to request permission to use this address.
It must send an ICMPv6 Router Solicitation message to determine what default gateway it should use.
It must send a DHCPv6 INFORMATION-REQUEST message to request the address of the DNS server.
It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.
M8: Which command should be configured on a router interface to set the router as a stateful DHCPv6 client?
ipv6 address dhcp
ipv6 dhcp server stateful
ipv6 enable
ipv6 address autoconfigure
M8: What message informs IPv6 enabled interfaces to use stateful DHCPv6 for obtaining an IPv6 address?
the DHCPv6 Reply message
the DHCPv6 Advertise message
the ICMPv6 Router Advertisement
the ICMPv6 Router Solicitation
M8: Which destination IP address is used when an IPv6 host sends a DHCPv6 SOLICIT message to locate a DHCPv6 server?
FF02::1:2
FF02::2
FE80::1
FF02::1
M8: In which alternative to DHCPv6 does a router dynamically provide IPv6 configuration information to hosts?
SLAAC
ICMPv6
ARP
EUI-64
M8: A company implements the stateless DHCPv6 method for configuring IPv6 addresses on employee workstations. After a workstation receives messages from multiple DHCPv6 servers to indicate their availability for DHCPv6 service, which message does it send to a server for configuration information?
DHCPv6 INFORMATION-REQUEST
DHCPv6 REQUEST
DHCPv6 SOLICIT
DHCPv6 ADVERTISE
M8: What process is used in ICMPv6 for a host to verify that an IPv6 address is unique before configuring it on an interface?
EUI-64
ARP
SLAAC
DAD
M8: What are two characteristics of the SLAAC method for IPv6 address configuration? (Choose two.)
Clients send router advertisement messages to routers to request IPv6 addressing.
IPv6 addressing is dynamically assigned to clients through the use of ICMPv6.
The default gateway of an IPv6 client on a LAN will be the link-local address of the router interface attached to the LAN.
This stateful method of acquiring an IPv6 address requires at least one DHCPv6 server.
Router solicitation messages are sent by the router to offer IPv6 addressing to clients.
M8: After booting, a client receives an ICMPv6 RA message with the M flag set to 0 and the O flag set to 1. What does this indicate?
The client should automatically configure an IPv6 address and then contact a DHCPv6 server for more information.
The client should automatically configure an IPv6 address without contacting a DHCPv6 server.
The client should request an IPv6 address directly from a DHCPv6 server.
The client should be statically configured with an IPv6 address because the local router does not support autoconfiguration.
M8: A network administrator is entering the command ipv6 unicast-routing to start configuring DHCPv6 operation on a router. Which statement describes the function of this command?
It is required to configure stateful DHCPv6 server on the router.
It is required for sending ICMPv6 RA messages.
It is required for enabling DNS service in DHCPv6 configurations.
It is required to configure stateless DHCPv6 server on the router.
M9: What type of device routes traffic destined to network segments beyond the source network segment for which the sending node may not have explicit routing information?
virtual router
standby router
default gateway
Layer 3 switch
M9: What device presents the illusion of a single router to hosts on a LAN segment but actually represents a set of routers working together?
virtual router
standby router
default gateway
Layer 3 switch
M9: What device is part of a virtual router group assigned the role of alternate default gateway?
virtual router
standby router
default gateway
Layer 3 switch
M9: What device that is part of a virtual router group assigned to the role of default gateway?
virtual router
forwarding router
default gateway
Layer 3 switch
M9: Which FHRPs are Cisco-proprietary? (Choose two.)
IRDP
HSRP
HSRP for IPv6
VRRPv2
M9: What is the default HSRP priority?
50
100
150
255
M9: True or False? If a router with a higher HSRP priority joins the network, it will take over the active router roll from an existing active router which has a lower priority.
True
False
M9: During which HSRP state does an interface begin sending periodic hello messages?
initial
listen
speak
Active
M9: Which is a characteristic of the HSRP learn state?
the router has not determined the virtual IP address
the router knows the virtual IP address
the router sends periodic hello messages
the router actively participates in the active/standby election process
M9: What is the purpose of HSRP?
It prevents malicious hosts from connecting to trunk ports.
It enables an access port to immediately transition to the forwarding state.
It prevents a rogue switch from becoming the STP root.
It provides a continuous network connection when a router fails.
M9: Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?
SLB
HSRP
VRRPv2
GLBP
M9: A network administrator is analyzing first-hop router redundancy protocols. What is a characteristic of VRRPv3?
It works together with HSRP.
It allows load balancing between routers.
It supports IPv6 and IPv4 addressing.
VRRPv3 is Cisco proprietary.
M9: What is a potential disadvantage when implementing HSRP as compared to GLBP?
HSRP does not function in a multivendor environment.
HSRP provides default gateway failover only when the active router fails.
HSRP does not provide load balancing with multiple active routers.
HSRP does not have the capability to support IPv6 addresses.
M9: A network engineer is configuring a LAN with a redundant first hop to make better use of the available network resources. Which protocol should the engineer implement?
VRRP
HSRP
GLBP
FHRP
M9: When first hop redundancy protocols are used, which two items will be shared by a set of routers that are presenting the illusion of being a single router? (Choose two.)
MAC address
BID
hostname
IP address
static route
M9: In FHRP terminology, what represents a set of routers that present the illusion of a single router to hosts?
default gateway
forwarding router
standby router
virtual router
M9: A user needs to add redundancy to the routers in a company. What are the three options the user can use? (Choose three.)
HSRP
GLBP
VRRP
RAID
IPFIX
M9: Which two protocols provide gateway redundancy at Layer 3? (Choose two.)
HSRP
VRRP
PVST
STP
RSTP
M9: A network administrator is overseeing the implementation of first hop redundancy protocols. Which two protocols are Cisco proprietary? (Choose two.)
GLBP
VRRP
HSRP
IRDP
VRRPv2
M9: Which statement describes a characteristic of GLBP?
It provides automatic rerouting if any router in the group fails.
It does not provide support for IPv6.
It provides multiple virtual IP addresses and multiple virtual MAC addresses.
It provides load balancing for a maximum of four gateways.
M9: A network administrator is analyzing the features that are supported by different first-hop router redundancy protocols. Which statement is a feature that is associated with GLBP?
It uses a virtual router master.
It is nonproprietary.
GLBP allows load balancing between routers.
It works together with VRRP.
