easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting a BGP route advertisement issue
A network engineer is troubleshooting a BGP route advertisement issue. Router R1 (AS 65001) has an eBGP session with R2 (AS 65002). R1 is advertising the prefix 192.168.1.0/24 to R2. On R2, the route appears in the BGP table but is not installed in the routing table. The output of 'show ip bgp 192.168.1.0/24' on R2 shows the route as valid, best, but with the 'r' flag (RIB-failure). The routing table on R2 shows a static route for 192.168.1.0/24 with administrative distance 1. 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 BGP route is not installed because a static route with a lower administrative distance exists for the same prefix.
RIB-failure occurs when BGP tries to install a route but a route with a lower administrative distance already exists. Here, the static route (AD 1) is preferred over the eBGP route (AD 20).
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 route is not installed because a static route with a lower administrative distance exists for the same prefix.
Why this is correct
Correct because the static route (AD 1) is better than eBGP (AD 20), causing RIB-failure.
- ✗
The BGP route is not installed because the next-hop is unreachable.
Why it's wrong here
Incorrect because next-hop unreachability would show the route as not best, not as RIB-failure.
- ✗
The BGP route is not installed because BGP synchronization is enabled.
Why it's wrong here
Incorrect because synchronization would cause the route to not be considered best, not RIB-failure.
- ✗
The BGP route is not installed because the prefix length is too long.
Why it's wrong here
Incorrect because prefix length does not cause RIB-failure.
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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.