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300-410 Practice Question: Is troubleshooting a BGP route filtering issue
A network engineer is troubleshooting a BGP route filtering issue. Router R1 is advertising a prefix 10.1.1.0/24 to its eBGP neighbor R2, but R2 is not receiving it. The engineer checks R1's BGP configuration and sees a route-map named FILTER-OUT applied outbound to the neighbor. The route-map references an ACL that permits 10.1.1.0/24, but the prefix is still not being sent. 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 route-map is missing a 'permit' statement; the default action is deny.
The route-map must have an explicit permit statement; if the route-map is missing the permit clause, or if the sequence number is incorrect, the implicit deny at the end of the route-map will filter all routes. The ACL permitting the prefix is necessary but not sufficient if the route-map itself does not have a permit action.
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 route-map is missing a 'permit' statement; the default action is deny.
Why this is correct
Correct because route-maps without an explicit permit will implicitly deny all prefixes.
- ✗
The ACL is using the wrong wildcard mask; it should be 0.0.0.255 instead of 0.0.0.0.
Why it's wrong here
Incorrect because the wildcard mask 0.0.0.0 matches only the exact prefix, which is fine for 10.1.1.0/24.
- ✗
The neighbor is configured with 'soft-reconfiguration inbound' which blocks outbound updates.
Why it's wrong here
Incorrect because soft-reconfiguration inbound only affects inbound updates, not outbound.
- ✗
The route-map is applied inbound instead of outbound on R1.
Why it's wrong here
Incorrect because the scenario states the route-map is applied outbound.
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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.