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300-410 Practice Question: An engineer is troubleshooting a missing BGP…
An engineer is troubleshooting a missing BGP route on R3. R3 has an eBGP session with R4 (AS 65004) and an iBGP session with R1 (AS 65003). R4 advertises a prefix 192.168.1.0/24 to R3, and R3's BGP table shows the route with next-hop 10.1.4.4. However, R3 does not install this route in its routing table. The output of 'show ip bgp 192.168.1.0/24' on R3 shows the route as valid but not best. 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 is not installed because the next-hop 10.1.4.4 is not reachable via any routing table entry.
For an eBGP route to be installed, the next-hop must be reachable via an IGP or static route. If the next-hop is not reachable, BGP marks the route as valid but not best.
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 is not installed because the next-hop 10.1.4.4 is not reachable via any routing table entry.
Why this is correct
Correct because BGP requires the next-hop to be reachable; otherwise, the route is not considered best.
- ✗
The route is not installed because BGP synchronization is enabled and the IGP does not have the route.
Why it's wrong here
Incorrect because synchronization is disabled by default in modern IOS and is rarely the cause.
- ✗
The route is not installed because the prefix length is too long for the routing table.
Why it's wrong here
Incorrect because BGP installs any prefix length unless filtered; this is not a typical issue.
- ✗
The route is not installed because R3 has a higher administrative distance for eBGP routes.
Why it's wrong here
Incorrect because eBGP routes have AD 20, which is lower than many IGPs; this would not prevent installation.
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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.