mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R4: R4# show…
A network engineer runs the following command on Router R4:
R4# show logging | include %BGP-3-NOTIFICATION *Mar 1 00:01:05.123: %BGP-3-NOTIFICATION: sent to neighbor 10.0.0.2 4/0 (Hold Timer Expired) 0 bytes *Mar 1 00:02:10.456: %BGP-3-NOTIFICATION: received from neighbor 10.0.0.2 4/0 (Hold Timer Expired) 0 bytes *Mar 1 00:03:15.789: %BGP-3-NOTIFICATION: sent to neighbor 10.0.0.2 4/0 (Hold Timer Expired) 0 bytes
Based on this output, what is the most likely problem?
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
✓
There is a connectivity issue causing keepalive packets to be lost.
The output shows BGP notifications for hold timer expiration between R4 and neighbor 10.0.0.2. This indicates that keepalive messages are not being exchanged in time, causing the BGP session to reset repeatedly. This is typically due to a flapping link, high CPU load, or mismatched hold timers.
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 BGP neighbor has a mismatched autonomous system number.
Why it's wrong here
A mismatched AS would cause a notification with error code 2 (open message error), not hold timer expired.
- ✓
There is a connectivity issue causing keepalive packets to be lost.
Why this is correct
Hold timer expiration means keepalives are not received within the hold time, indicating packet loss or high delay.
- ✗
The BGP update interval is too short, causing excessive updates.
Why it's wrong here
Update interval does not affect hold timer; keepalive timer is separate.
- ✗
The router is configured with soft-reconfiguration inbound, causing memory issues.
Why it's wrong here
Soft-reconfiguration does not cause hold timer expiration.
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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.