Which statement correctly describes BFD packet behavior?
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Correct answer: BFD control packets are sent via UDP port 3784 to the destination router..
Why this is the answer
BFD (Bidirectional Forwarding Detection) control packets are indeed sent using UDP port 3784 to the destination router. This allows for rapid detection of forwarding path failures between two routers. The first option is incorrect because BFD itself doesn't choose paths; it simply detects failures. The routing protocol (IGP) then uses this failure information to converge and select an alternate path. The second option is incorrect because BFD is designed to be lightweight and typically offloaded to line cards or hardware, minimizing impact on the route processor CPU. The fourth option is incorrect because BFD echo packets are sent to the same source and destination IP address, and they use UDP, not TCP, typically on port 3785.
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