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300-410 Practice Question: An engineer is troubleshooting a BGP route…
An engineer is troubleshooting a BGP route selection issue. Router R1 receives two paths for prefix 10.0.0.0/8: one from eBGP peer R2 (AS 65002) with weight 0, local preference 100, and AS path 65002; and another from eBGP peer R3 (AS 65003) with weight 0, local preference 200, and AS path 65003 65004. R1's BGP table shows the path from R3 as the best route. The engineer wants the path from R2 to be preferred. What should the engineer do?
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
✓
Configure a route-map on R1 to set weight 100 for routes from R2.
BGP path selection compares weight first. Setting weight 100 for routes from R2 makes the R2 path preferred over the R3 path (both have default weight 0). Option B setting local preference 250 would also make R2 preferred, but weight is compared earlier and is the more direct single-answer action. Option A sets local preference 150, still lower than R3's 200, so R3 remains preferred. Option C prepends AS numbers to the R3 path, but local preference 200 vs 100 is evaluated before AS path length, so R3 still wins unless weight is changed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a route-map on R1 to set local preference 150 for routes from R2.
Why it's wrong here
Setting local preference 150 is lower than the R3 path's 200, so R2 remains less preferred. Incorrect.
- ✗
Configure a route-map on R1 to set local preference 250 for routes from R2.
Why it's wrong here
Setting local preference 250 is higher than 200, so after weight comparison (both 0), R2 becomes the best path. Correct.
- ✗
Configure a route-map on R1 to prepend two additional AS numbers to the AS path from R3.
Why it's wrong here
Prepending AS path only affects AS path length comparison, which occurs after local preference. Since R2's local preference is lower, this change does not help. Incorrect.
- ✓
Configure a route-map on R1 to set weight 100 for routes from R2.
Why this is correct
Setting weight 100 makes R2's path have higher weight than R3's default weight 0. Weight is compared first, so R2 becomes the best path. Correct.
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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.