Home > CCNA – IP Routing Questions

CCNA – IP Routing Questions

April 17th, 2015 Go to comments

Question 1

Explanation

The router considers the most reliable information about the path (the best route) based on Administrative Distance (AD). This is a good tutorial about AD: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/15986-admin-distance.html.

In general, the AD number defines the reliability of a routing protocol. A directly connected interface has an AD of 0 which is best so it is always chosen first.

Question 2

Question 3

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 4

Question 5

Explanation

From the CCNA ICND2 Exam book: “Routers decrement the TTL by 1 every time they forward a packet; if a router decrements the TTL to 0, it throws away the packet. This prevents packets from rotating forever.” I want to make it clear that before the router forwards a packet, the TTL is still remain the same. For example in the topology above, pings to S0/1 and S0/0 of Router 2 have the same TTL.

The picture below shows TTL values for each interface of each router and for Host B. Notice that Host A initializes ICMP packet with a TTL of 255:

TTL_ping_detail.jpg

Question 6

Question 7

Explanation

In this question, Host1 wants to ping Host2 but it receives a reply from the interface Fa0/0 of Router1 (10.1.1.1/24) that the “destination host unreachable”.

If the link between Host1 and Switch1 is down or the link between Switch1 and Router1 is down then Host1 can not receive this reply -> A and F are not correct.

Host1 can receive a reply from 10.1.1.1 -> the TCP/IP is working properly -> B is not correct.

For answer D, if the default gateway was not configured correctly on Host1 (in this case the default gateway should be 10.1.1.1/24) then 10.1.1.1 can not receive the ping packets from Host1 and can not reply for Host1 that the destination is unreachable -> D is not correct.

Interface Fa0/0 on Router1 replies for the ping packets from Host1 so it is up -> E is not correct. If the interface Fa0/0 on Router is shutdown then we will receive a message of “Request timed out”, not “Destination host unreachable”.

Answer C is correct because we can get a reply from the interface Fa0/0 of Router1 so the link between Host1 and Router1 should be fine -> the problem lies at the other side of Router1. But if the link between Router2 and Host2 is down then we will receive a reply from interface S0/1 of Router2 that the “destination host unreachable”. Therefore the problem can just be the link between Router1 and Router2.

Question 8

Question 9

Explanation

The simple syntax of static route:

ip route destination-network-address subnet-mask {next-hop-IP-address | exit-interface}
+ destination-network-address: destination network address of the remote network
+ subnet mask: subnet mask of the destination network
+ next-hop-IP-address: the IP address of the receiving interface on the next-hop router
+ exit-interface: the local interface of this router where the packets will go out

In the statement “ip route 10.5.6.0 255.255.255.0 fa0/0″:

+ 10.5.6.0 255.255.255.0: the destination network
+ fa0/0: the exit-interface

Comments (50) Comments
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  1. Priya
    July 11th, 2015

    Q.9 was in the exam on July 10.

  2. 9tut
    July 12th, 2015

    @all: We had to move all the questions and answers out of 9tut. We can only keep the explanation. You can download the questions and answers at: https://mega.co.nz/#!wt9kVCjL!vvp79FTtjsqfpCgq0uTOTKlE6_qsLY6C_m163sNGs_s

  3. why no questions
    July 12th, 2015

    @9tut: the link for questions is not working. And why these questions have been removed from this site. Questions are still valid or not? Please reply as I have my exam this week only

  4. why no questions
    July 12th, 2015

    @9tut: the link for questions is not working. And why these questions have been removed from this site. Questions are still valid or not? Please reply as I have my exam this week only

  5. Karina
    July 13th, 2015

    Why did you remove the questions?

  6. 9tut
    July 13th, 2015

    @all: Cisco sued pass4sure because of posting their questions. So we think we would better remove their copyrighted questions before they sue us. We are vey sorry for the inconvenience we caused. Please use the PDF file for questions instead.

  7. Animesh
    July 27th, 2015

    hi 9tut
    atleast put link for PDF .
    thanks

  8. Asaq
    July 31st, 2015
  9. Q4
    August 2nd, 2015

    can any one explain q4

  10. anon
    August 12th, 2015

    Dear All,

    I was wondering why I am only able to view the explanations and the questions do not load

    Thank You!

  11. Jorge Pires Ferreira
    August 16th, 2015

    Can you please, help me with this question ?
    Packets are able to take two different paths across the network to their destination. The first path has a 10 Mbps link, a 5 Mbps link, and a 100 Mbps link. The second path uses a 2 Mbps link and a 100Mbps link. What is the cost of the path the packets will take?
    A. 31
    B. 51
    C. 20
    D. 11

    Correct answer: A

  12. Niel
    August 18th, 2015

    Hi 9tut! i would just like to ask a questions are questions here are all up to date? are they all updated weekly? are they updated regularly?

  13. jheisenberg
    August 18th, 2015

    9tut can you please fix the questions please? this site was great.

  14. niel
    August 19th, 2015

    Hi @9tut! i would just like to ask a questions are questions here are all up to date? are they all updated weekly? are they updated regularly?

  15. Anonymous
    August 22nd, 2015

    None of the questions are available since few days can you guys fix it please? Thank you.

  16. 9tut
    August 22nd, 2015

    @Anonymous: We had to move all the questions and answers out of 9tut because of copyrighted issues. We can only keep the explanation. You can download the questions and answers at: http://www.mediafire.com/view/2r1tai7xqa05qub/CCNAquestions_Jul_7_2015.pdf

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    August 23rd, 2015

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    August 26th, 2015

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    September 3rd, 2015

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    September 12th, 2015

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    October 3rd, 2015

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  22. Dencio
    October 6th, 2015

    Which two benefits are provided by using a hierarchical addressing network addressing scheme? (Choose two)

    A. reduces routing table entriesB. auto-negotiation of media rates
    C. efficient utilization of MAC addresses
    D. dedicated communications between devices
    E. ease of management and troubleshooting

    ANSWER: A, E

    EXPLANATION:

    A is correct because if your scheme is hierarchical, you can summarize the routes. Ie, if one router has routes for 192.168.0.0/24, 192.168.1.0/24, 192.168.2.0/24 and 192.168.3.0/24, they can summarize it as 192.168.0.0/22 to all upstream neighbors, only needing to pass one route instead of 4. This is especially important for global internet routing, as the BGP table is quite large.

    B is layer 1 function, doesn’t involve addressing at all.

    In an IP world C is blatantly wrong. MAC addresses are burned in at the factory, the administrator doesn’t set them. As well, MAC’s aren’t used in IP routing, they’re used for link local communication within a network segment at layer 2.

    D. is likewise pointless and has more to do with link-local communication than network wide communication. Every device having dedicated links to every other device is cost prohibitive, so a good network scheme is irrelevant.

    E is also correct. Having a good network scheme, like say these contiguous subnets are assigned to this site… if there’s a problem with those addresses, then I immediately know which site is likely to be having issues, and that reduces troubleshooting and remediation time. Likewise, it would be easy to craft, say, ACL’s to restrict or allow traffic to a site. In the same concept of route summarization to reduce routing table size, a good network scheme would allow me to write ACL statements that apply to an entire site with fewer lines, which reduces network complexity and management.

  23. Dencio
    October 6th, 2015

    Users on the 172.17.22.0 network cannot reach the server located on the 172.31.5.0 network. The network administrator connected to router Coffee via the console port, issued the show ip route command, Based on the output of the show ip route command and the topology shown in the graphic, what is the cause of the failure?

    A. The network has not fully converged.
    B. IP routing is not enabled.
    C. A static route is configured incorrectly.
    D. The FastEthernet interface on Coffee is disabled.
    E. The neighbor relationship table is not correctly updated.
    F. The routing table on Coffee has not updated .

    Answer: C

    Explanation:

    The default route or the static route was configured with incorrect next-hop ip address 172.19.22.2
    The correct ip address will be 172.18.22.2 to reach server located on 172.31.5.0 network.
    Ip route 0.0.0.0 0.0.0.0 172.18.22.2

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    November 6th, 2015

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    December 3rd, 2015

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    December 22nd, 2015

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    February 15th, 2016

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    February 18th, 2016

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  29. Kennedy
    February 21st, 2016

    Hi,
    Nice questions…a good routing protocol explanation with RIP and packet tracer is here also…enjoy..
    http://ipcisco.com/rip-configuration-with-packet-tracer/

  30. Anonymous
    February 28th, 2016

    can I get the IP routing Tutorial

  31. bj
    March 3rd, 2016

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    March 23rd, 2016

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  33. Patrick
    April 28th, 2016

    I took the exam today and passed but the question reference Coffee and Tea was confusing b/c on the actual test it said that the admin consoled to the router and was able to ping the server successfully. I put a comment on the exam that said based on the ip route output, the static default route would never have appeared in the table b/c the 172.22.19.0 network was not in the table. Cisco seriously tries to outsmart themselves with their questions.

  34. Mohd Taleb
    May 2nd, 2016

    Q4:
    Notice that imply without decreasing network performance?
    D. router-on-a-stick: one physical interface, therefore performance is decreased
    A. Add two more FastEthernet interfaces. i think it is correct.
    please correct me

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    May 6th, 2016

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    May 13th, 2016

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  37. aziz
    May 15th, 2016

    Jorge Pires Ferreira August 16th, 2015

    cost = 10 puiss 8 / bandwidth in bit
    10m + 5mb + 100mb = 10^8 / 10*10^6 + 10^8/5*10^6 +10^8/100*10^6 = 10+20+1 =31

  38. Ana
    June 6th, 2016

    Q: What is the correct routing match to reach 172.16.1.5/32?
    A. 172.16.1.0/26
    B. 172.16.1.0/25
    C. 172.16.1.0/24
    D. the default route
    Ans: A
    I want to know how? please help , I’m novice!

  39. To the guy above
    June 7th, 2016

    Ana – A, B, C all have same ip address so it comes down to the subnet mask being used by them. Longest mask would be preferred, as per the “Longest prefix match” rule, so /26 one would be the answer.
    At least, this is my interpretation. I might be wrong!

  40. rava
    July 6th, 2016

    why D is not correct ?

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    July 7th, 2016

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    July 28th, 2016

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    any one who can provide me 364 PDF support will be highly appreciated

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  43. Perviz
    July 28th, 2016

    Please help on question 5. in packet tracer ttl for router 3 interface on host B side is 253 not 252. and router doesnt decrement ttl until packet goes away from router. it is the same result when pinging one router with multiple interfaces. is packet tracer correct or explanation on 9tut? please help

  44. Neo
    August 14th, 2016

    Question 5 explained above isn’t correct.

    The correct answer is 253
    The default TTL is 255, and as a packet passes through a router the TTL is decremented. By the time the ping packet
    reaches S0/0 on Router 3, it has passed through two routers and the TTL is now 253. Note that the S0/0 interface responds
    to the ping: the packet is not router by Router 3 and so the TTL in the ping packet is not decremented to 252

    Cheers!
    Neo

  45. durjoy
    August 18th, 2016

    What is the default maximum number of equal-cost paths that can be placed into the
    routing table of a Cisco OSPF router?

    i found 2 answer in 2 vce

    1. 4
    2. 8

    which one correct?

  46. Chandu
    August 26th, 2016

    Is it possible to ping R2 from R1?

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