mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting a BGP session that is dropping…
A network engineer is troubleshooting a BGP session that is dropping intermittently. The routers are connected via a Layer 2 switch. BFD is configured for the BGP session. The engineer notices that the BFD session goes down briefly, causing the BGP session to reset. The BFD timers are set to 100 ms interval with a multiplier of 3. The switch is not configured for BFD. What is the most likely cause?
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
✓
The BFD timers are too aggressive for the switch's processing capabilities, causing BFD packets to be dropped during high traffic.
BFD sessions can be affected by congestion or processing delays in the Layer 2 switch, especially with aggressive timers. The switch not supporting BFD does not inherently cause issues, but high CPU or buffer drops can cause BFD packets to be dropped.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The BFD timers are too aggressive for the switch's processing capabilities, causing BFD packets to be dropped during high traffic.
Why this is correct
Aggressive BFD timers (100 ms) can overwhelm a switch that is not optimized for fast packet forwarding, leading to intermittent BFD failures.
- ✗
The BGP session is not configured with the 'bfd' command under the neighbor statement.
Why it's wrong here
If BFD were not configured for BGP, the BGP session would not reset when BFD goes down; the symptom indicates BFD is active.
- ✗
The switch is running Spanning Tree Protocol (STP) and causing delays.
Why it's wrong here
STP does not affect already-forwarding ports; BFD packets are not blocked by STP.
- ✗
One router has 'bfd slow-timers' configured, causing a mismatch.
Why it's wrong here
Slow-timers are used for echo mode; a mismatch would prevent the BFD session from forming, not cause intermittent drops.
Go deeper
Related to this question
About these practice questions
This 300-410 question is part of Courseiva's 1,966-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.