CCNA 2 Chapter 9 V4.0 Answers

1. What two actions will the EIGRP DUAL FSM take if a link to a network goes down? (Choose two.)

put the route into passive mode

query neighbors for a new route

search routing table for a feasible successor

run the SPF algorithm to find a new successor

search topology table for a feasible successor

 

2.

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Host 192.168.1.66 in the network illustrated is unable to ping host 192.168.1.130. How must EIGRP be configured to enable connectivity between the two hosts? (Choose two.)

R1(config-router)# network 192.168.1.128

R1(config-router)# auto-summary

R1(config-router)# no auto-summary

R2(config-router)# no auto-summary

R2(config-router)# auto-summary

R2(config-router)# network 192.168.1.64

 

3.

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Refer to the exhibit. The company is using EIGRP with an autonomous system number of 10. Pings between hosts on networks that are connected to router A and those that are connected to router B are successful.
However, users on the 192.168.3.0 network are unable to reach users on the 192.168.1.32 network. What is the most likely cause of this problem?

IP classless is enabled and is causing the packet to drop.

The command network 192.168.1.32 was not issued on router C.

The routers are not configured in the same EIGRP routing domain.

Automatic summarization of the networks is causing the subnetted routes to be dropped.

 

4. What information is maintained in the EIGRP topology database for a destination route? (Choose three.)

the routing protocol

the feasible distance of the route

the highest cost of the route

the SRTT value for the route

the route cost as advertised by the neighboring router

the physical address of the gateway interface

 

5. On a router running EIGRP, what database would maintain a list of feasible successors?

routing table

neighbor table

topology table

adjacency table

 

6.

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Refer to the exhibit. What is indicated by the P at the beginning of the topology entry?

the route is in a stable state

the route is a preferred route

DUAL is searching for a better route to this destination

the exit interface is in passive mode and EIGRP advertisements are blocked

 

7. In the command router eigrp 20, what is the purpose of the number 20?

specifies the administrative distance for all EIGRP routes

identifies the autonomous system number this EIGRP process will advertise

determines what metric is added to all advertised routes

indicates the number of addresses in the EIGRP routing domain

 

8.

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Refer to the exhibit. In the topology table, what do the numbers 3011840 and 3128695 represent?

the route metric that is applied to those EIGRP routes for this router

the trustworthiness of the routing information source

the composite of the hop count and bandwidth to that destination network

the total metric for that network as advertised by the EIGRP neighbor

 

9. Which two statements describe characteristics of EIGRP? (Choose two.)

EIGRP is a distance vector routing protocol.

EIGRP supports classless routing and VLSM.

EIGRP is classified as a link-state routing protocol.

EIGRP uses TCP for reliable delivery of EIGRP update packets.

With EIGRP, loop-free paths are achieved through the use of hold-down timers.

EIGRP sends a periodic update every 30 minutes.

 

10.

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Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send to Router1 and Router3?

a query for network 192.168.0.0/28

an acknowledgment packet to 224.0.0.9

an update packet that is sent to 255.255.255.255

a packet that contains the new routing table for R2

unicast update packets to 192.168.1.1 and 192.168.2.1

 

11.

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Refer to the exhibit. Which command will advertise the 192.168.1.64/30 network but not the 192.168.1.32 network on router A?

network 192.168.1.0

network 192.168.1.0 255.255.255.0

network 192.168.1.64 0.0.0.3

network 192.168.1.64 0.0.0.7

network 192.168.1.64 0.0.0.255

 

12. What administrative distance would a router assign to a default route in EIGRP that is learned from a source external to the autonomous system?

1

5

70

90

170

190

 

13. In which of the following tables does the EIGRP DUAL algorithm store the primary route to a destination? (Choose two.)

routing

topology

neighbor

path

shortest path

 

14. Which of the following types of routes will be denoted by EX in EIGRP routing table entries? (Choose two.)

routes learned from other routing protocols

routes learned from any non-adjacent EIGRP routers

any route with a hop count metric higher than 224

EIGRP routes that originate in different autonomous systems

all passive routes in the routing table

 

15. Which term defines a collection of networks under the administrative control of a single entity that presents a common routing policy to the Internet?

autonomous system

contiguous networks

process ID

BGP

 

16.

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Refer to the exhibit. EIGRP is the only routing protocol enabled on this network. No static routes are configured on this router. What can be concluded about network 198.18.1.0/24 from the exhibited output?

A route to network 198.18.1.0/24 is not listed in the routing table.

Packets that are destined for 198.18.1.0/24 will be forwarded to 198.18.10.6.

EIGRP will perform equal cost load balancing across two paths when forwarding packets to 198.18.1.0/24.

The router with interface 172.16.3.2 is a successor for network 198.18.1.0/24.

 

17.

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Refer to the exhibit. All interfaces have been configured with the bandwidths that are shown in the exhibit. Assuming that all routers are using a default configuration of EIGRP as their routing protocol, what path will packets take from the 172.16.1.0/16 network to the 192.168.200.0/24 network?

A,B,E

A,C,E

A,D,E

Packets will load balance across the A,B,E and A,C,E paths.

Packets will load balance across the A,B,E and A,D,E paths.

Packets will load balance across the A,C,E and A,D,E paths.

 

18. By default, which two metrics are used by EIGRP to determine the best path between networks?

MTU

load

delay

bandwidth

reliability

 

19. Which of the following statements describes the bounded updates used by EIGRP?

Bounded updates are sent to all routers within an autonomous system.

Partial updates are sent only to routers that need the information.

The updates are sent to all routers in the routing table.

Updates are bounded by the routers in the topology table.

 

20. The show ip eigrp topology command output on a router displays a successor route and a feasible successor route to network 192.168.1.0/24. In order to reduce processor utilization, what does EIGRP do when the primary route to this network fails?

The router sends query packets to all EIGRP neighbors for a better route to network 192.168.1.0/24.

The DUAL FSM immediately recomputes the algorithm to calculate the next backup route.

Packets that are destined for network 192.168.1.0/24 are sent out the default gateway instead.

The backup route to network 192.168.1.0/24 is installed in the routing table.

 

21.

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Refer to the exhibit. Based on the output of show ip eigrp neighbors, what are two possible problems with adjacencies between Router1 and Router2? (Choose two.)

The routers are configured with different EIGRP process IDs.

Automatic summarization was disabled.

The hello timer for R1 was altered.

The serial interfaces for both routers are in different networks.

No feasible successors were found.

 

22.

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Refer to the exhibit. This is the debug output from 2 directly connected EIGRP routers. They are not forming an adjacency. What is the cause?

one router is a non-cisco router

they have different autonomous-system numbers

they are using difference sequence numbers

they are sending incorrect hello types

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17 Responses - Add Yours+

  1. belal says:

    4-What information is maintained in the EIGRP topology database for a destination route? (Choose two.)
    the highest cost of the route
    the SRTT value for the route
    ****the feasible distance of the route
    the physical address of the gateway interface
    ****the route cost as advertised by the neighboring router

  2. Tom says:

    Refer to the exhibit. Which statement correctly describes the path traffic would take from the 10.0.0.0/24 network to the 192.168.1.0/24 network if a link-state routing protocol was in use?

    BOS -> ATL because this path is the least hops
    BOS -> ATL because this path is highest cost
    –> BOS -> ORL -> JAX -> ATL because this path is the lowest cost
    traffic would load balance across all links

  3. Tom says:

    What two statements correctly describe the link state routing process? (Choose two.)

    –> all routers in the area have link state databases
    –> each router in the area floods LSPs to all neighbors

    LSPs use the reserved multicast address of 224.0.0.10 to reach neighbors

    routing loops are prevented by running the Diffusing Update Algorithm (DUAL)

    Reliable Transport Protocol (RTP) is the protocol used by for the delivery and reception of LSPs

  4. Tom says:

    To achieve network convergence, what three steps does each link state router take? (Choose three.)

    use automatic summarization to reduce the size of routing tables

    –> build a Link State Packet (LSP) containing the state of each directly connected link

    —> flood the LSP to all neighbors, who then store all LSPs received in a database

    recalculate the number of hops to each network in the routing table

    –>construct a complete map of the topology and compute the best path to each destination network

    use the DUAL FSM to select efficient, loop-free paths, and insert routes into the routing table

  5. Tom says:

    Refer to the exhibit. What does JAX do with link-state packets from ORL?

    –> sends out its updated routing table to both ORL and BOS routers

    sends out the individual link-state packets out the interface connected to BOS

    queries BOS to see if it has a better route

    only adds it to the local routing table and performs no other actions

  6. Tom says:

    Of the steps given, what is the final step in the link state routing process?

    successors are placed into the routing table

    SPF computes best path to each destination network

    –> LSPs are flooded to all neighbors to converge the network

    DUAL algorithm is run to find best path to destination networks

  7. Arron Hiller says:

    Just took the exam & looking at the correct answers from Cisco shows that #10 was wrong. Here’s the correct answer:

    #10
    Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send to Router1 and Router3?

    —-> a query for network 192.168.0.0/28
    an acknowledgment packet to 224.0.0.9
    an update packet that is sent to 255.255.255.255
    a packet that contains the new routing table for R2
    unicast update packets to 192.168.1.1 and 192.168.2.1

  8. Evan says:

    Below is a correction to number 10.

    10. Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send to Router1 and Router3?

    *** a query for network 192.168.0.0/28 (correct answer)
    – an acknowledgment packet to 224.0.0.9
    – an update packet that is sent to 255.255.255.255
    – a packet that contains the new routing table for R2
    – unicast update packets to 192.168.1.1 and 192.168.2.1

    • Mark says:

      ???

      In the figure, R2 has lost connectivity to the LAN attached to its FastEthernet interface. R2 immediately sends an Update to R1 and R3 noting the downed route. R1 and R3 respond with an acknowledgement.

      In the figure, R2 has lost connectivity to the LAN and it sends out queries to all EIGRP neighbors searching for any possible routes to the LAN. Because queries use reliable delivery, the receiving router must return an EIGRP acknowledgement. (To keep this example simple, acknowledgements were omitted in the graphic.)

      EIGRP Packet Types 9.1.4

  9. Correct says:

    Below is a correction to number 10.

    10. Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send to Router1 and Router3?

    *** a query for network 192.168.0.0/28 (correct answer)
    – an acknowledgment packet to 224.0.0.9
    – an update packet that is sent to 255.255.255.255
    – a packet that contains the new routing table for R2
    – unicast update packets to 192.168.1.1 and 192.168.2.1

    I agree with this and confirmed it….Good luck everyone!!!

  10. Jen says:

    Number 10 should be

    *a query for network 192.168.0.0/28*

    • probie says:

      A query is sent; however, it is not the first thing that the router does. It first sends an update to tell its neighbors that the network is down. Neighbors send acknowledgments to the router. If the router does not have a backup route (feasible successor), the router sends queries to its neighbors for alternate routes to the ‘down’ network. Neighbors send acknowledgments to the router. The neighbors then send replies to the router. Finally, the router sends acknowledgments to its neighbors.
      Check it out:Routing Protocols and Concepts-Chapter 9 EIGRP, pgs 405-406 DUAL: An Introduction, figures 9-12, 9-13, 9-14, 9-15.

  11. Andrew says:

    Question 10 is definitely D. The maker of the quiz has made a mistake. If the network goes down a query is only sent if there is no feasible successor in the topology table. Why would you immediately send a query without checking if you don’t have a backup path to take?

    I understand the correct answer is supposed to be ‘A’ but I would like someone to explain why.

    Cheers.

    • Answer_is_A says:

      The answer is A. It cannot be D because of the keyword “unicast”. It needs to be a multicast in order for it to be correct

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