Which statement about Bidirectional Forwarding Detection (BFD) is correct?
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Correct answer: BFD echo mode is the default mode of operation..
Why this is the answer
BFD echo mode is the default and most efficient mode of operation. In echo mode, the forwarding engine on the remote system sends back the received BFD packets without processing them through the BFD session itself. This offloads the BFD processing from the control plane, allowing for faster detection times and reduced CPU utilization. BFD is supported for HSRP, allowing for rapid failure detection of the next-hop router. CEF (Cisco Express Forwarding) is a prerequisite for BFD to function, as BFD relies on the fast forwarding path. BFD is fully supported and commonly used with static routes to provide quick detection of link failures to the next-hop router.
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