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300-410 Practice Question: Runs the following command to troubleshoot a BFD…

A network engineer runs the following command to troubleshoot a BFD issue:

R1# debug bfd event

*Mar  1 00:12:34.567: BFD: [R1-to-R2] state DOWN -> UP (async)
*Mar  1 00:12:34.568: BFD: [R1-to-R2] echo mode enabled, min-echo-rx-interval 50 ms
*Mar  1 00:12:34.569: BFD: [R1-to-R2] starting echo timer, interval 50 ms
*Mar  1 00:12:34.570: BFD: [R1-to-R2] sending async packet, state UP, interval 300 ms

What does this output indicate?

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

BFD session is established and echo mode is active.

The debug output shows BFD session transitioning from DOWN to UP, with echo mode enabled and the async interval set to 300 ms. This indicates a successful BFD session establishment.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    BFD session is flapping between DOWN and UP states.

    Why it's wrong here

    The output shows a single transition from DOWN to UP, not flapping.

  • ✓

    BFD session is established and echo mode is active.

    Why this is correct

    The output confirms BFD session is UP, echo mode enabled, and timers are running.

  • ✗

    BFD session is down due to echo failure.

    Why it's wrong here

    No failure is indicated; echo mode is enabled and working.

  • ✗

    BFD async interval is misconfigured at 300 ms.

    Why it's wrong here

    300 ms is a typical default async interval; no misconfiguration is shown.

Visual reference

Client Server SYN (seq=100) SYN-ACK (seq=200, ack=101) ACK (ack=201) Connection established — data transfer begins

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Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.