An interface is configured on a router for OSPF but the command "show router ospf neighbor" does not show any neighbors. Which of the following is NOT a possible cause?
This is a trick question! The real answer is D. If the router hasn't received a valid OSPF Hello packet, then it won't be able to discover any neighbors. That's the key thing missing here.
Hmm, I'm going with A. An OSPF database description packet needs to be received before the neighbor relationship can be established. If that hasn't happened, it makes sense that no neighbors would be shown.
The correct answer is C. If the interface is included in a different area than the neighbor router, they won't be able to form an OSPF adjacency, and the 'show router ospf neighbor' command won't show any neighbors.
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