What are three requirements to ensure proper GRE or IP-IP tunnel routing? (Choose three.)
A. Keepalives must be used on stateless tunneling protocols.
B. Tunnel endpoints must have a route that directs traffic into the tunnel.
C. BGP must be used on intermediate devices.
D. Tunnel endpoints must have a valid route to the remote endpoint.
E. All intermediary devices must have a route to the tunnel endpoints.
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B,D,E are correct
This is incorrect.
Correct answer should be B,D,E.
Example, if I run GRE tunnels inside my own corporate network, I certianly don’t need to run BGP so that the intermediate devices know how to forward the GRE packet. Any IGP would work for this purpose.