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CCNA – EIGRP Questions 2

March 9th, 2011 Go to comments

Here you will find answers to EIGRP Questions – Part 2

Note: If you are not sure about EIGRP, please read my EIGRP tutorial.

Question 1

A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?

A. the OSPF route
B. the EIGRP route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes


Answer: B

Explanation

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below:

EIGRP_Administrative Distances_popular_routing_protocols.jpg

Question 3

Refer to the exhibit. Based on the exhibited routing table, how will packets from a host within the 192.168.10.192/26 LAN be forwarded to 192.168.10.1?

EIGRP_show_ip_route.jpg

A. The router will forward packets from R3 to R2 to R1
B. The router will forward packets from R3 to R1
C. The router will forward packets from R3 to R1 to R2
D. The router will forward packets from R3 to R2 to R1 AND from R3 to R1


Answer: D

Explanation

From the routing table we learn that network 192.168.10.0/30 is learned via 2 equal-cost paths (192.168.10.9 &192.168.10.5) -> traffic to this network will be load-balancing.

Question 4

Refer to the exhibit. The company uses EIGRP as the routing protocol. What path will packets take from a host on 192.168.10.192/26 network to a host on the LAN attached to router R1?

EIGRP_show_ip_route_2.jpg

R3# show ip route
Gateway of last resort is not set
192 168.10.0/24 is variably subnetted, 6 subnets, 2 masks
D 192.168.10.64/26 [90/2195456] via 192.168.10.9, 00:03:31, Serial0/0
D 192.168.10.0/30 [90/2681856] via 192.168.10.9, 00:03:31, Serial0/0
C 192.168.10.4/30 is directly connected, Serial0/1
C 192.168.10.8/30 is directly connected, Serial0/0
C 192.168.10.192/26 is directly connected, FastEthernet0/0
D 192.168.10.128/26 [90/2195456] via 192.168.10.5,00:03:31, Serial0/1

A. The path of the packets will be R3 to R2 to R1.
B. The path of the packets will be R3 to R1 to R2.
C. The path of the packets will be both R3 to R2 to R1 and R3 to R1.
D. The path of the packets will be R3 to R1


Answer: D

Explanation

Host on the LAN attached to router R1 belongs to 192.168.10.64/26 subnet. From the output of the routing table of R3 we learn this network can be reach via 192.168.10.9, which is an IP address in 192.168.10.8/30 network (the network between R1 & R3) -> packets destined for 192.168.10.64 will be routed from R3 -> R1 -> LAN on R1.

Question 5

Refer to the exhibit. A packet with a source IP address of 192.168.2.4 and a destination IP address of 10.1.1.4 arrives at the HokesB router. What action does the router take?

EIGRP_show_ip_route_ICMP.jpg

A. forwards the received packet out the Serial0/0 interface
B. forwards a packet containing an EIGRP advertisement out the Serial0/1 interface
C. forwards a packet containing an ICMP message out the FastEthemet0/0 interface
D. forwards a packet containing an ARP request out the FastEthemet0/1 interface


Answer: C

Explanation

When a packet with destination IP address of 10.1.1.4 arrives at HokesB, it will look up in the routing table to find the most specific path. In this case no path is found so HokesB must inform to the source host that the destination is unreachable on the interface it has received this packet (it is Fa0/0 because the network 192.168.2.0/28 is learned from this interface). So the best answer here should be C – send an ICMP message out of Fa0/0.

Question 6

The EIGRP configuration in the Glencoe router uses a single network statement. From the output shown in the graph would advertise these networks in EIGRP?

EIGRP_show_ip_protocol_network_advertised.jpg

A. network 172.26.168.0 area 478
B. network 172.26.0.0
C. network 172.26.168.128 0.0.0.127
D. network 172.26.168.128 area 478


Answer: B

Explanation

The single “network …” statement used to advertise network 172.26.168.128/26 & 172.26.169.0/26 must cover both of them -> it is “network 172.26.0.0″. Notice the “network 172.26.168.128 0.0.0.127″ command is valid but it only covers from 172.26.168.128 to 172.26.168.255.

Question 7

Refer to the exhibit. From RouterA, a network administrator is able to ping the serial interface of RouterB but unable to ping any of the subnets attached to RouterB. Based on the partial outputs in the exhibit, what could be the problem?

EIGRP_show_ip_protocl_show_ip_route.jpg

A. EIGRP does not support VLSM.
B. The EIGRP network statements are incorrectly configured.
C. The IP addressing on the serial interface of RouterA is incorrect.
D. The routing protocol has summarized on the classful boundary.
E. EIGRP has been configured with an invalid autonomous system number.


Answer: D

Explanation

From the output of “show ip route” command on RouterB, we learn that RouterB does not learn any networks in RouterA. Also the “172.16.0.0/26 is a summary, 00:00:03, Null0″ line tells us this netwok is summarized.

Note: EIGRP performs auto-summarization each time it crosses a border between two major networks. For example, RouterA has networks of 172.16.x.x. It will perform auto-summarization when sending over network 10.1.1.0/30, which is in different major network (172.16.0.0/16 and 10.0.0.0/8 are called major networks in this case).

Comments (166) Comments
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    June 19th, 2012

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    June 21st, 2012

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    June 29th, 2012

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  7. comm2003
    July 17th, 2012

    Q7,,I had a certain understanding about eigrp similar cases from my labs which i found not to be true in the answer of this question,, i do understand that eigrp without no auto summary command would advertize a summary route to router b,, but since router b already has interfaces with the same major network ,172.16.0.0 with a mask of /28,, then routes advertized from a to b will be advertized with the same mask /28,, thus i expect to find them in router b routing table beside the summary route.. any one can help??

  8. Thomas – taking CCNA this Sat!!!
    July 19th, 2012

    Hi Ya’ll! Im taking CCNA in 2 days. If anyone has the questions dump, please email to ktwinsm@gmail.com. Thanks you in advance :) And thanks 9tut!

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    July 21st, 2012

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  13. jfrodo
    August 12th, 2012

    Question # 6 Eigrp
    I still don’t understand how network 172.26.128.0 0.0.0.127 won’t suffice. It a 169.0 vs a 128.0 on 26 mask on class c address meaning the range is .128-255 only applies to the 4th octet and it wouldn’t cover 169.0. I think I got it now.Wow that one really made me think!

  14. jfrodo
    August 12th, 2012

    I guess the reason why its confusing is because a class C subnet mask is usually applied to the numbers in the third and fourth octets. But the wildcard mask of o.o.o.127 …the .127 is applied only in the fourth octet.

  15. jd
    August 17th, 2012

    #7 How can it be D when both EIRGP protocol summaries show that they have the same AS showing as “EIRGP 100″?

  16. clare
    August 20th, 2012

    pls if passive interface is configured on an interface running eigrp, should it be removed, bc we know that it wil prevent adjacencies from being formed on that interface?

  17. Sajad
    August 25th, 2012

    Q3, Ok I understand the correct answer, but in the routing table, routes to 192.168.10.1 are:
    … via 192.168.10.9 …
    … via 192.168.10.5 …
    and those IPs are connected to R3
    shouldn’t they be like:
    … via 192.168.10.10 … <- next hop
    … via 192.168.10.6 … <- next hop
    they should go to the next hop! not the interfaces connected to the same router!
    Does this routing table even work?

  18. jacsatx
    August 29th, 2012

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  19. yoy
    September 2nd, 2012

    @Ruben
    Because you have 3 networks:
    182.168.90.0
    192.168.80.0
    192.168.81.0
    Or you can explain yourself that you can see 3 interfaces so there must be 3 broadcast domains

  20. Ashol
    September 10th, 2012

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    September 17th, 2012

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  22. imran
    September 18th, 2012

    i have same question as Sajad.
    Q3, Ok I understand the correct answer, but in the routing table, routes to 192.168.10.1 are:
    … via 192.168.10.9 …
    … via 192.168.10.5 …
    and those IPs are connected to R3
    shouldn’t they be like:
    … via 192.168.10.10 … <- next hop
    … via 192.168.10.6 … <- next hop
    they should go to the next hop! not the interfaces connected to the same router?

    Can anybody explain it please. Thanks

  23. Satz
    September 24th, 2012

    Hi all, In CCNA exam if there are 2 options to be selected as answers, if 1 answer is right and other is wrong, will i get half the mark alloted for that question?

  24. kushal arora
    September 26th, 2012

    @satz…
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  25. Mintah from Ghana
    October 1st, 2012

    @Imram: You are absolutely correct. The next hop should be the
    192.168.10.10 on R1 and
    192.168.10.6 on R2.

    the IPs stated above are wrong.

  26. Mintah from Ghana
    October 1st, 2012

    @Kushal Arora: Don’t put out any panic if you don’t know. No one knows how cisco marks their exams and I diffenetely believe you will get a mark if some of you multiple choices correct.

    @Satz: Don’t worry about that. Cisco is not that mean. Just LEARN HARD and believe in yourself that you will pass.

  27. Mosal
    October 2nd, 2012

    guys, just wondering what is the chance to get wireless questions in the real exam? anyone got wireless questions in his/her exam day?

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  30. soopros
    October 15th, 2012

    @ mosal u will get only 2 question about wireless

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    October 24th, 2012

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  32. YO…………..
    October 26th, 2012

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  33. passerby
    October 31st, 2012

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  35. Shiva
    November 6th, 2012

    Can someone please explain how to obtain the result for Question 6?

  36. SAJAN
    November 27th, 2012

    Pls explain Qn 7

  37. Oulkarnain
    December 9th, 2012

    Any1could explain Q no 7, please?

  38. Omar
    December 10th, 2012

    Very cool, remember to write down qusiteons and get a detailed answer. Class line up looks good though; IPv6 is a must know as IPv4 will be gone before we know it. Enjoy,JC.Bogard

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    December 13th, 2012

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    from here Q 3

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    January 20th, 2013

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    January 22nd, 2013

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    January 31st, 2013

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    Q:6

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    February 10th, 2013

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    February 10th, 2013

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