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EIGRP GRE Troubleshooting Sim

March 19th, 2018 Go to comments

Refer to the topology below. Your company asks you to identify the issues in Phase 1 EIGRP implementation. You have console access on R1, R2, R3 Branch1 and Branch2 routers. Only use show commands to troubleshoot the issues.


Question 1


R1 routing table does not have any EIGRP learned routes so R1 or the link between R1 & R2 is the most likely problem. We should check if the IP addresses on R1 and R2 are correct or not with the “show ip interface brief” command.


Note: You should check the IP address of R2 E0/0 interface (the interface connected to R1) as well.

Question 2


The “main office” here refers to R2 (and other routers behind it). Check Branch2 with the “show ip route” command:


We can see Branch2 only uses (Branch 1 – the secondary path) to reach R2 and the subnets behind. Branch2 does not use the primary path (directly connected to R2) so there must be a problem with the connection between R2 and Branch2. Check Branch2 router with the “show running-config” command and we can see an access-list is blocking EIGRP packets advertised to Branch2.


Question 3


This issue is same as Question 2 but this time it is R3 which causes the issue. We can check R3 with the “show running-config” command.


Question 4


In this question we should check the local routers to see if these subnets have been advertised or not as there are many issues in the path which prevent these subnets from being shown in the routing tables.

When checking Branch1 router, we notice “network” is missing under EIGRP 200 so answer D is correct.


Comments (50) Comments
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    June 16th, 2018

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    June 16th, 2018

    I have a question about labs for people who has taken the exam recently.

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    June 19th, 2018

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    June 19th, 2018

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  49. Kseniya
    June 28th, 2018

    Hey. Passed yesterday. I’ve got 6 simulations, this one, eigrp ,vlan, rip troubleshoot, ipv6 ospf and acl troubleshoot. Answers were a bit different from here, some questions were twisted, so be careful and check. Lots of new questions I’ve never seen before.
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  50. daveS
    June 29th, 2018

    What are the actual EIGRP questions 1-4 ? Thank you.

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