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300-410 Practice Question: Runs the following command to troubleshoot BFD…
A network engineer runs the following command to troubleshoot BFD session flapping:
R1# debug bfd packet *Mar 1 00:15:23.456: BFD: [R1-to-R3] received async packet from 10.5.5.2, state UP, diag 0 *Mar 1 00:15:23.457: BFD: [R1-to-R3] sending async packet, state UP *Mar 1 00:15:23.458: BFD: [R1-to-R3] received echo packet from 10.5.5.2, state UP *Mar 1 00:15:23.459: BFD: [R1-to-R3] echo packet lost, no echo received for 300 ms *Mar 1 00:15:23.460: BFD: [R1-to-R3] state UP -> DOWN (echo failure)
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 went DOWN because of echo timeout, indicating possible path issue.
The debug output shows that BFD detected an echo failure (no echo packets received for 300 ms), causing the session to go DOWN. This indicates a connectivity issue or misconfiguration affecting echo mode.
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 UP and stable.
Why it's wrong here
The session transitions to DOWN due to echo failure.
- ✓
BFD session went DOWN because of echo timeout, indicating possible path issue.
Why this is correct
Echo packets were lost, causing BFD to declare the session down.
- ✗
BFD async packets are failing, causing session down.
Why it's wrong here
Async packets are being sent and received; only echo packets are lost.
- ✗
BFD session is flapping due to misconfigured multiplier.
Why it's wrong here
The cause is echo failure, not multiplier misconfiguration.
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JA
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.