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352-001 · Question #310
352-001 Question #310: Real Exam Question with Answer & Explanation
The correct answer is A: It can be used with asynchronous mode.. BFD echo function sends packets that are looped back through the remote system's forwarding plane, and it works alongside asynchronous mode, can be enabled per direction, and validates the remote forwarding path.
Question
You are working on a network design for Customer A. This design should consider fast convergence features, and it was agreed that BFD should be used for faster link-transition detection. Which three options apply to the use of the echo function in BFD? (Choose three.)
Options
- AIt can be used with asynchronous mode.
- BBFD control packets are not required.
- CIt can be enabled individually in each direction.
- DIt has the advantage of testing the forwarding path on the remote system.
- EThe rate of periodic transmission of BFD control packets should be increased.
Explanation
BFD echo function sends packets that are looped back through the remote system's forwarding plane, and it works alongside asynchronous mode, can be enabled per direction, and validates the remote forwarding path.
Common mistakes.
- B. BFD control packets are still required even when echo function is active - the echo function reduces their transmission rate but does not eliminate them, as they are needed to maintain the session state machine.
- E. Enabling the echo function allows the rate of BFD control packets to be decreased, not increased, because echo packets assume the fast failure-detection role and control packets are only needed for session maintenance.
Concept tested. BFD echo function operation and directional control
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