For a GRE tunnel to be up between two routers, which of the following must be configured?

A. Loopback Interface

B. IP reachability between the loopback interfaces

C. Dynamic Routing between routers.










 

Suggested Answer: D. Tunnel interfaces must be in the same subnet.

GRE tunnels dont require loopbacks. They work quite well using physical interfaces as the source and destination. They also dont require dynamic routing; static routes work just fine. Place the IP addresses assigned to the tunnels in different subnets and there wont be any connectivity over the tunnels that is unless you place static routes at both endpoints pointing to the remote tunnel IP address via the tunnel. Host routes work just fine.

This question is in 300-101 Cisco Implementing Cisco IP Routing (ROUTE) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate




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