Refer to the topology below and answer the following question. Why is the Branch2 network 10.1 0.20.0/24 unable to communicate with the Server farm1 network 10.10.10.0/24 over the GRE tunnel?
- The GRE tunnel destination is not configured on the R2 router
- The GRE tunnel destination is not configured on the Branch2 router
- The static route points to the tunnel0 interface that is misconfigured on the Branch2 router
- The static route points to the tunnel0 interface that is misconfigured on the R2 router.
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.
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:
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.
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