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GRE Multilink Sim

September 11th, 2017 Go to comments

Refer to the topology below and answer the following questions.

Topology.jpg

Note: There may be different faults in this sim so please notice the following faults:

1. ACL blocking traffic on interface between R2 and R3
2. The network was not advertised in EIGRP
3. Two routers couldn’t establish adjacency because of ACL
4. Another two routers couldn’t establish adjacency because of wrong IP configuration on interface between them

Question 1

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

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

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

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 (13) Comments
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  1. me
    March 28th, 2018

    @all
    can anyone share this topology?

  2. Shay
    April 3rd, 2018

    why isn’t this sim on the front page of 9tut? is it no longer in the exam?
    same for IPv6 OSPF?

  3. 9tut
    April 4th, 2018

    @Shay: We have just posted this sim at the right-side menu. We are working on the IPv6 OSPF sim. Please wait for some time.

  4. Ali
    April 12th, 2018

    I got exam for this Labs

  5. Muhiz
    April 12th, 2018

    @9tut can you share this topology ???

  6. 9tut
    April 13th, 2018

    @Muhiz: The topology has been posted at the beginning of this page.

  7. Muhiz
    April 13th, 2018

    i cant see it. there is no link to download.

  8. 9tut
    April 13th, 2018

    @Muhiz: Maybe you mentioned about the Packet Tracer file of this sim. We are sorry but we don’t have it.

  9. salman shaikh
    April 15th, 2018

    kindly share or send me also all questions you have ( dcentpal at gmail dot com )
    or dumps also

  10. Muhiz
    April 16th, 2018

    @9tut yah i figured that out, anyway we cant do multilink configuration in packet tracer.

  11. sultan
    April 16th, 2018

    hi there
    hop you doing well
    can you give as adumb

  12. sultan
    April 16th, 2018

    hi there
    i hop you doing well
    can you give us adumb

  13. Vlonee
    April 16th, 2018

    9tut why dont you guys post the scenerio questions plus we can no longer download lab sims, why is that? We need to study the questions too.

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