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GRE Multilink Sim

October 20th, 2016 in LabSim Go to comments

Refer to the topology below and answer the following questions.

Topology.jpg

Question 1

Why is the Branch2 network 10.10.20.0/24 unable to communicate with the Server farm 1 network 10.10.10.0/24 over the GRE tunnel?

A. The GRE tunnel destination is not configured on the R2 router.
B. The GRE tunnel destination is not configured on the Branch2 router.
C. The static route points to the tunnel0 interface that is misconfigured on the Branch2 router.
D. The static route points to the tunnel0 interface that is misconfigured on the R2 router.

 

Answer: C

Explanation

The Branch2 network is communicating to the Server farm, which is connected to R2, via GRE Tunnel so we should check the GRE tunnel first to see if it is in “up/up” state with the “show ip interface brief” command on the two routers.

On Branch2:

Branch2_show_ip_interface_brief.jpg

On R2:

R2_show_ip_interface_brief.jpg

We see interfaces Tunnel0 at two ends are “up/up” which are good so we should check for the routing part on two routers with the “show running-config” command and pay attention to the static routing of each router. On Branch2 we see:

R2_show_run_static.jpg

The destination IP address for this static route is not correct. It should be 192.168.24.1 (Tunnel0’s IP address of R2), not 192.168.24.10 -> Answer C is correct.

Note: You can use the “show ip route” command to check the routing configuration on each router but if the destination is not reachable (for example: we configure “ip route 10.10.10.0 255.255.255.0 192.168.24.10” on Branch2, but if 192.168.24.10 is unknown then Branch2 router will not display this routing entry in its routing table.

Note: The IP address or configuration may be different in the exam.

Question 2

Why has the Branch3 router lost connectivity with R1? Use only show commands to troubleshoot because usage of the debug command is restricted on the Branch3 and R1 routers?

A. A PPP chap hostname mismatch is noticed between Branch3 and R1.
B. A PPP chap password mismatch is noticed between Branch3 and R1.
C. PPP encapsulation is not configured on Branch3.
D. The PPP chap hostname and PPP chap password commands are missing on the Branch3 router.

 

Answer: A

Explanation

First we should check Branch3 (and R1) with the “show ip interface brief” command to find any Layer1/Layer 2 issue.

Branch3_show_ip_interface_brief.jpg

We see the interfaces connecting between them are in “up/down” states which indicates an Layer 2 issue so we should check the configuration of these interfaces carefully with the “show running-config” command and pay attention to these interfaces.

R1_show_run_interface.jpg

and on Branch3:

Branch3_show_run_interface.jpg

We learn from above config is R1 is using CHAP to authenticate Branch3 router (via the “ppp authentication chap” command on R1). Branch3 router is sending CHAP hostname “Branch_3” and CHAP password “Branch3_Secret!” to R1 to be authenticated. Therefore we should check if R1 has already been configured with such username and password or not with the “show running-config” command on R1:

R1_show_run_username.jpg

On R1 we see the configured username is “Branch3”, not “Branch_3” so the usernames here are mismatched and this is the problem -> Answer A is correct.

Question 3

Which statement about the router configurations is correct?

A. PPP PAP is authentication configured between Branch2 and R1.
B. Tunnel keepalives are not configured for the tunnel0 interface on Branch2 and R2.
C. The Branch2 LAN network 192.168.11.0/24 is not advertised into the EIGRP network.
D. The Branch3 LAN network 192.168.10.0/24 is not advertised into the EIGRP network.
E. PPP CHAP is authentication configured between Branch1 and R1.

 

Answer: D

Explanation

In this question we have to check each option to see if it is correct. When we check Branch3 router we notice that “network 192.168.10.0” command is missing under “router eigrp 100” -> Answer D is correct.

Branch3_show_run_eigrp.jpg

Question 4

Why did Branch1 router lose WAN connectivity with R1 router?

A. The IP address is misconfigured on PPP multilink interface on the Branch1 router.
B. The PPP multilink group is misconfigured on the Branch1 serial interfaces.
C. The PPP multilink group is misconfigured on the R1 serial interfaces.
D. The Branch1 serial interfaces are placed in a shutdown condition.

 

Answer: A

Explanation

This question clearly stated there is a WAN connectivity issue between R1 and Branch1 so we should check both of them with the “show ip interface brief” command. On R1:

R1_show_ip_interface_brief.jpg

On Branch1:

Branch1_show_ip_interface_brief.jpg

We can see that although the Multilink1 interfaces are in “up/up” state but they are not in the same subnet. According to the IP address scheme shown on the topology we can deduce the Multilink interface on Branch1 has been misconfigured, it should be 192.168.14.2 instead.

Comments (25) Comments
  1. Tanigo
    December 6th, 2016

    what a wonderful tutorials.

  2. CCNA_For_Life
    December 12th, 2016

    Do you have the .pka files for this? Can I download them somewhere?

  3. ICND-new
    December 15th, 2016

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  4. chan chan man
    December 19th, 2016

    thank you so much for this

  5. Salene
    December 20th, 2016

    CCNA Cisco Certified Network Associate CCNA (v3.0) Exam 200-125 dumps are available on https://www.dumps4download.us/free-200-125/cisco-question-answers.html

  6. pjc118
    January 14th, 2017

    Failed ICND2 today. Three SIM’s EIGRP, OSPF and GRE. Ran out of time, very hard exam today

  7. pjc118
    January 14th, 2017

    60% of the students failed the ICND2 exam today. No problems with R&S its just all the new stuff

  8. iraqi
    January 14th, 2017

    hi man @pjc118 it,s doesn’t meaning you fail they changed staff,
    you get to time out ?
    or the changed questions .

  9. failed01
    February 8th, 2017

    Failed ICND2 exam today. It is indeed hard and run out of time also.

  10. failed01
    February 8th, 2017

    This sim was on the exam, but I remembered my answered on Q1 was b, because I saw there was no tunnel destination configure on the tunnel. Is it right or wrong?

  11. failed01
    February 8th, 2017

    As for Q2 my answer was d, because when I show run I did not see the ppp chap username and ppp chap password on Branch3 serial interface configuration. I guess they frequently change the content of the sims configuration even though same scenario, question, and topology.

  12. failed01
    February 8th, 2017

    Q3 and 4 are correct btw

  13. washhtsirishlover
    February 11th, 2017

    I just took and failed 200-105 test. There was a question on it about SNMP and OID, I don’t remember it exactly, been looking for info on it everywhere with no luck. Does anyone out there remember the question I’m referring to? Would really like to know.

  14. ICND-new
    February 13th, 2017

    New RELEASE Dumps Exam questions updated. Now 263 Qs are latest and valid, get download at below page:

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  15. Anonymous
    February 23rd, 2017

    This site is a waste f money…..http://rebrand.ly/newic2b92….files won’t open and no one responds to emails or phone calls

  16. Shiwa
    March 14th, 2017

    Passed my test yesterday. Always check the configuration by yourself.

  17. huma
    April 2nd, 2017

    heyy so how many questions are there in the tests and which portion should we focus more planning to give by the end of month

  18. thehandsomeguy
    April 3rd, 2017

    hope this comes in my exam, seems like an easy one

  19. james
    April 5th, 2017

    Here is some sample Video and PDF lab for GRE tunneling. http://asmed.com/cisco-ccna-gre-tunnel-configuration/

  20. ash
    May 2nd, 2017

    where can i download the GRE sim plz

  21. ramos
    May 8th, 2017

    is there any drag and drops questions,
    also is there any holddown timer ,poision revers all of these drag and drop questions,?????

    how many incorrect question do i have in order to pass, let say of my question were , do i still have chance to pass

  22. Michael
    May 17th, 2017

    Yes, you’ll fail it first time. Not an easy test. Eventually you will succeed.

  23. These 2 labs
    May 19th, 2017

    For the ICND1 should we be going through the Composite Quizzes also?

    ICND1 – Composite Quizzes
    ICND1 – Security Testlet Simulator
    ICND1 – Show Configuration Simulator
    ICND1 – DHCP Simulator

  24. Pl413r
    May 31st, 2017

    Failing is not an option, specially when you’re short on cash!
    Study hard and test your knowledge on regular questions and do the labs and understando how to troubleshoot them and you will pass in 1st attempt!

  25. Lisah
    June 14th, 2017

    Hello guys…
    passed my ICND1 100-105 yesterday!!
    thanks to everyone for sharing your exam experiences it really helped me.

    Now looking forward to taking the ICND2 200-105. has anyone taken this exam, please do share any information you have that might help?

    Thank you again.