To have OSPF immediately tear down an adjacency when the BFD session fails, which actions are required? Choose two.
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Correct answer: Enable BFD on the interface carrying the OSPF adjacency, Ensure both routers establish a BFD session (both ends must run BFD).
Why this is the answer
To immediately tear down an OSPF adjacency upon BFD session failure, BFD must be explicitly enabled on the interface participating in the OSPF adjacency. This links the BFD session state to the OSPF neighbor state. Additionally, BFD is a bidirectional protocol, requiring both routers to support and establish a BFD session for it to function. Decreasing OSPF hello/dead timers is a separate mechanism for faster convergence and doesn't directly integrate with BFD for immediate adjacency teardown. The ip ospf bfd command globally enables BFD for OSPF but doesn't activate it on specific interfaces; per-interface configuration is still necessary.
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