Home > ICND2 – IP Routing

ICND2 – IP Routing

April 26th, 2015 in ICND2 200-101 Go to comments

Question 1

Explanation

Static routing can only be configured for each route manually so it is more secure than dynamic routing which only needs to declare which networks to run -> A is correct.

Also static route does not use any complex algorithm to find out the best path so no routing updates need to be sent out -> reduce routing traffic load. Static routing is useful especially in stub network links.

Note: Stub network (or stub router) is used to describe a network (or router) that does not have any information about other networks except a default route. This type of network (or router) usually has only one connection to the outside.

Question 2

Explanation

By default a static route has the Administrative Distance (AD) of 1, which is always preferred to dynamic routing protocols. In some cases we may want to use dynamic routing protocols and set static routes as a backup route when the “dynamic” routes fail -> we can increase the AD of that static route to a higher value than the AD of the dynamic routing protocols.

Question 3

Explanation

Discontiguous networks are networks that have subnets of a major network separated by a different major network. Below is an example of discontiguous networks where subnets 10.10.1.0/24 and 10.10.2.0/24 are separated by a 2.0.0.0/8 network.

EIGRP_discontiguous_network_1.jpg

If we configure automatic summarization at classful boundaries, users on network 10.10.1.0/24 cannot communicate with users on network 10.10.2.0/24.

If you are not clear about automatic summarization please read the last part of this tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial.

Question 4

Explanation

Host1 can ping the Serial interface of R2 because R1 has the network of 192.168.1.4/30 as directly connected route. But R1 does not know how to route to the network of Host2 (192.168.1.128/26) so R1 will drop that ping without trying to send it out S0/0 interface. To make the ping work, we have to configure a route pointing to that network (for example: ip route 192.168.1.128 255.255.255.192 s0/0 on R1).

Question 5

Explanation

All the above networks can be summarized to 10.0.0.0 network but the question requires to “represent the LANs in Phoenix but no additional subnets” so we must summarized to 10.4.0.0 network. The Phoenix router has 4 subnets so we need to “move left” 2 bits of “/24”-> /22 is the best choice -> D is correct.

Question 6

Explanation

From the output we see a line “Gateway of last resort is 192.168.4.1 to network 0.0.0.0”. Gateway of last resort refers to the next-hop router of a router’s current default route. Therefore all the traffic through this router to destination networks not matching any other networks or subnets in the routing table will be sent to 192.168.4.1 (which is on Serial2) -> packet destined for 192.0.2.156 (or an unknown destination) will be forwarded via Serial2.

An weird thing in the output above is the missing of the asterisk mask (*) which represents for the candidate default route. To set the “Gateway of last resort is 192.168.4.1 to network 0.0.0.0” as the output above we can use these commands:

ip route 0.0.0.0 0.0.0.0 192.168.4.1
ip default-network 192.168.4.0

But these commands will create an static routing in the routing table with an asterisk mask. Maybe the output shown above is missing that route.

For more information about the command ip default-network please visit: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml.

Question 7

Explanation

Static routes remain in the routing table even if the specified gateway becomes unavailable. If the specified gateway becomes unavailable, you need to remove the static route from the routing table manually. However, static routes are removed from the routing table if the specified interface goes down, and are reinstated when the interface comes back up.

Therefore the static route will only be removed from the routing table if the S0/0 interface on RTA is shutdown.

(Reference: http://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/route_static.html)

Comments (38) Comments
  1. hdawg
    February 23rd, 2014

    Question 7.
    The question stated that interface FA0/0 is shut down. Per the “explanation”, shouldn’t the static route then be removed from the routing table?? IF that’s the case, then Answer A is not correct.

  2. Clone
    February 27th, 2014

    The route is not removed because the interface Fa0/0 that is placed in shutdown state is on RTB. To remove the static route from the RTA routing table, RTA interface S0/0 should become down.

  3. hdawg
    March 22nd, 2014

    ah, yes, I see now. Thanks

  4. woody
    April 3rd, 2014

    This website is great. My boyfriend is studying for his ICND2 so I’m using these questions to create quiz’s for him.

    Keep up the good work.

    Thank you

  5. mike
    April 14th, 2014

    Took ICND2 earlier today, 986 / 1000.

    Questions 1, 4, 6 and 7 from this page were on there.

  6. routerking
    April 20th, 2014

    Can someone explain # 6 I’m not seeing that subnet in the routing table.

  7. ghast
    April 21st, 2014

    Routerking,

    For #6, Option C is correct because that route doesn’t exist in the routing table. When you have a default route specified, a packet destined for an address outside of your specified routes will be sent to the default route. In this case, the default route says to send everything to Serial2.

  8. Justin
    April 30th, 2014

    Passed with 986/1000

    2, 4, 6 and 7 from this page were on the test

  9. fez
    May 8th, 2014

    1,2,4,6,7 were there

    Passed today my ICND@2 by 1000. Got different configuration of the Eigrp & frame Relay labs where there were different DLCIs and IP addresses, but same process was used to get answers (show commands, show ip protocols, show ip interface brief ).

    A question about GLBP and a question about netflow were on my test. You can find them here: http://www.examtut.com/2013/09/new-questions-in-ccna-200-120-hsrp-vrrp.html

    Study 9tut and this guy i found him really helpful. He has unique way of teaching http://www.danscourses.com If you can do all his videos again and again. Trust me you will get the concept. Also one thing i learned today is if you don’t know the concept it’ll be hard for you in the exam.

    All the best to every one in their path. Keep me in your good wishes.

  10. Mark
    May 13th, 2014

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  12. James
    June 24th, 2014

    Question 5

    I understand why D is the correct answer but i dont understand why it is a /22. can someone please explain

  13. izzarazzu
    June 27th, 2014

    Took the exam today. Pass 986/1000. Q1, Q4, Q6, Q7 were on there.
    Thanks 9tut.

  14. Patrick
    July 3rd, 2014

    James, Question 5 is /22 because a Summary Static route has the mask show which bits are the same for multiple routes. Since the routes to summarize in binary end in 000, 001, 010, 011 then the only bit that remains the same for all those is the first zero in each, which is the /22 (“move left” two bits from /24).

  15. Ant
    August 20th, 2014

    Tested today, 8/20. #2, 3, 4, 5, 7 were on there.

  16. Miguel
    September 5th, 2014

    passed the ICND 1 and going for the ICND 2 and so far this is the first question I am confused on. Question 5 Can someone break the whole question/answer down to dummy terms please?

  17. JB
    September 11th, 2014

    Miguel,

    Notice that the four “/24” subnets all share the same first 22 bits…

    00001010.00000100.00000000.XXXXXXXX = 10.4.0.XXX
    00001010.00000100.00000001.XXXXXXXX = 10.4.1.XXX
    00001010.00000100.00000010.XXXXXXXX = 10.4.2.XXX
    00001010.00000100.00000011.XXXXXXXX = 10.4.3.XXX

    00001010.00000100.000000XX.XXXXXXXX = /22 for summarization…

  18. Georges
    September 27th, 2014

    took the exam today and pass with 907. Question 2, 3, 4 and 7 were on there, the others weren’t. location United States Florida.

    test ICND 2

    Thanks 9tut

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    December 4th, 2014

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  20. Andrew
    February 16th, 2015

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    Regards!!!

  21. Ryan
    February 26th, 2015

    @Andrew: How did you get on with the re-take?

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  23. Akhil
    March 4th, 2015

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    March 8th, 2015

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  25. barney
    March 20th, 2015

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  26. Dabconcept01
    April 30th, 2015

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  27. Marco
    May 13th, 2015

    I got Q2, Q3, Q4, Q7 today in my ICND2 exam.
    Thanks 9tut.

  28. Dude
    June 20th, 2015

    I kinda disagree with Q7 – this is a Serial interface, once RTB S0/0 is shut down, RTA Serial interface will go down as well (to be more specific the status will be protocol down) therefore the Static entry will be removed from the routing table. Please correct me if I am mistaken
    Thanks

  29. Dude
    June 20th, 2015

    misread the question – sorry – it says Should interface Fa0/0 on router RTB shut down, what effect will the shutdown
    and I agree with the answer

  30. Grisha82
    June 22nd, 2015

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  36. 808ed
    March 21st, 2016

    Would someone please explain q3 regarding Automatic summarization at classful boundaries. I thought only auto -summary involves classless.
    Thanks in adv.

  37. MIKE
    May 12th, 2016

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