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For a GRE tunnel to be up between two routers, which of the following must be configured?
Correct Answer: D
Explanation/Reference: GRE tunnels don't require loopbacks. They work quite well using physical interfaces as the source and destination. They also don't require dynamic routing; static routes work just fine. Place the IP addresses assigned to the tunnels in different subnets and there won't 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.