CCNA Discovery 3: DRSEnt Chapter 5 Exam Answers v4.0

1. What three statements are true about routers that are configured for EIGRP? (Choose three.)

  • They can support multiple routed protocols
  • They can support only link-state protocols.
  • They send their entire routing tables to neighboring routers.
  • They send partial routing updates in response to topology changes.
  • They send routing updates to all other routers in the network.
  • They use hello packets to inform neighboring routers of their status.

2. Given the following commands:

Router(config)# router rip
Router(config-router)# network

What three conclusions can be determined based on the commands used on the router? (Choose three.)

  • A link-state routing protocol is used.
  • A distance vector routing protocol is used.
  • Routing updates broadcast every 30 seconds.
  • Routing updates broadcast every 90 seconds.
  • Hop count is the only metric used for route selection.
  • Bandwidth, load, delay, and reliability are metrics used for route selection.

3. What is indicated when an EIGRP route is in the passive state?

  • The route has the highest path cost of all routes to that destination network.
  • The route must be confirmed by neighboring routers before it is put in the active state.
  • The route is a feasible successor and will be used if the active route fails.
  • There is no activity on the route to that network.
  • The route is viable and can be used to forward traffic.

4. What two problems may occur if the EIGRP default bandwidth for a serial link is higher than the actual bandwidth? (Choose two.)

  • Routing updates will arrive too quickly for receiving routers to process.
  • The port IP address will be rejected by the routing protocol.
  • Suboptimal paths will be selected.
  • The port protocol will return to the HDLC default.
  • VLSM support will be disabled.
  • Network convergence may be affected.

5. What is the default administrative distance for EIGRP internal routes?

  • 70
  • 90
  • 100
  • 110
  • 120
  • 255

6. A network administrator issues the command show ip route and sees this line of output: [120/2] via, 00:00:05, Serial0/0

What two pieces of information can be obtained from the output? (Choose two.)

  • RIP is the routing protocol configured.
  • This is a static route to network
  • The metric for this route is 2.
  • The next periodic update is in 5 seconds.
  • The autonomous system number is 120.

7. Refer to the exhibit. Which statement is true about the EIGRP authentication configuration?

  • RTA and RTB will accept updates from each other.
  • RTA and RTB will not accept updates from each other because key 1 on RTB does not match RTA.
  • RTA and RTB will not accept updates from each other because the key chain names do not match.
  • The ip authentication mode AS does not match the locally configured AS.

8. Which Layer 4 protocol does EIGRP use to provide reliability for the transmission of routing information?

  • DUAL
  • IP
  • PDM
  • RTP
  • TCP
  • UDP

9. Refer to the exhibit. Routers RTR-1 and RTR-3 are completely configured. The administrator needs to configure the routing protocol on router RTR-2 so that communication occurs throughout the network. Which group of commands will successfully configure EIGRP on RTR-2?

  • RTR-2(config)# router eigrp 1
    RTR-2(config-router)# network
  • RTR-2(config)# router eigrp 1
    RTR-2(config-router)# network no-summary
    RTR-2(config-router)# network no-summary
    RTR-2(config-router)# network no-summary
  • RTR-2(config)# router eigrp 1
    RTR-2(config-router)# network area 0
    RTR-2(config-router)# network area 0
    RTR-2(config-router)# network area 0
  • RTR-2(config)# router eigrp 1
    RTR-2(config-router)# network
    RTR-2(config-router)# network
    RTR-2(config-router)# network

10. What prevents RIPv1 updates from being correctly advertised?

  • an increase in network load
  • the use of variable length subnet masks
  • the use of multiple Layer 3 networks on the same router
  • a variation in connection speeds on the links to a destination
  • a mismatch between the configured bandwidth and the actual bandwidth of a link

11. What does a router that is running RIP use to determine the best path to take when forwarding data?

  • the host portion of the network address
  • the speed of network convergence
  • the calculated metric for the destination network
  • the number of broadcasts occurring on an interface
  • the number of errors occurring on an interface

12. What is the purpose of the network command when RIP is being configured as the routing protocol?

  • It identifies the networks connected to the neighboring router.
  • It restricts networks from being used for static routes.
  • It identifies all of the destination networks that the router is allowed to install in its routing table.
  • It identifies the directly connected networks that will be included in the RIP routing updates.

13. How do EIGRP routers establish and maintain neighbor relationships?

  • by exchanging neighbor tables with directly attached routers
  • by comparing known routes to information received in updates
  • by exchanging hello packets with neighboring routers
  • by dynamically learning new routes from neighbors
  • by exchanging routing tables with directly attached routers

14. Refer to the exhibit. Routers A and B have EIGRP configured and automatic summarization has been disabled on both routers. Which router command will summarize the attached routes?

  • ip area-range eigrp 1
  • ip summary-address eigrp 1
  • ip summary-address
  • ip summary-address eigrp 1
  • ip area-range eigrp 1

15. How often does RIPv2 send routing table updates, by default?

  • every 30 seconds
  • every 45 seconds
  • every 60 seconds
  • every 90 seconds

16. Refer to the exhibit. A network administrator is troubleshooting a routing problem. When the show ip route command is entered on RTR-1, only the serial link between RTR-2 and RTR-3 has been learned from the RIP routing protocol. What are two issues? (Choose two.)

  • RIPv1 is a classful routing protocol.
  • RIPv1 does not support subnetting.
  • The Ethernet networks on RTR-2 and RTR-3 were not entered correctly in the network statements on these routers.
  • RIPv1 does not support VLSM.
  • RIPv1 is a classless routing protocol.

17. What two statements are correct regarding EIGRP authentication? (Choose two.)

  • EIGRP authentication uses the MD5 algorithm.
  • EIGRP authentication uses a pre-shared key.
  • EIGRP authentication requires that both routers have the same key chain name.
  • EIGRP authentication uses varying levels of WEP to encrypt data exchanged between routers.
  • EIGRP authentication can be configured on one router and updates from this router are protected; whereas a neighbor router can be without the authentication configuration and its updates are unprotected.

18. When should EIGRP automatic summarization be turned off?

  • when a router has not discovered a neighbor within three minutes
  • when a router has more than three active interfaces
  • when a network contains discontiguous network addresses
  • when a router has less than five active interfaces
  • when a network addressing scheme uses VLSM

19. What is the maximum number of hops that RIP will attempt before it considers the destination unreachable?

  • 14 hops
  • 15 hops
  • 16 hops
  • 17 hops

20. What two statements are true regarding EIGRP tables? (Choose two.)

  • A feasible successor route can be found in the topology table.
  • A successor route can only be found in the routing table.
  • The topology table shows whether a route is in the passive or active state.
  • The routing table shows the amount of time elapsed since a router adjacency was formed.
  • The neighbor table shows all adjacent Cisco devices.
  • Administrative distance is shown as a column in the neighbor table.

21. Refer to the exhibit. Which statement is true about the output from the show ip protocols command?

  • RIPv2 is configured on this router.
  • Auto summarization has been disabled.
  • The next routing update is due in 17 seconds.
  • is the address configured on the local router
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