hardMultiple ChoiceObjective-mapped
300-410 Practice Question: In an iBGP network, router R1 has: router bgp…
In an iBGP network, router R1 has:
router bgp 65000
bgp bestpath as-path multipath-relax
neighbor 10.1.1.2 route-map SET-MED in
route-map SET-MED permit 10 set metric 50
neighbor 10.1.1.3 route-map SET-MED2 in
route-map SET-MED2 permit 10 set metric 100
Router R2 shows: R2# show ip bgp 192.168.1.0/24
BGP routing table entry for 192.168.1.0/24, version 2 Paths: (2 available, best #2) Path #1: via 10.1.1.1, metric 50 Path #2: via 10.1.1.4, metric 100
R2# show ip route 192.168.1.0
Routing entry for 192.168.1.0/24 Known via "bgp 65000", distance 200, metric 100 Last update from 10.1.1.4 00:00:10 Serial0/0/1 R2 is choosing the path with higher metric. What is the root 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 path with lower MED is from a different AS, so MED is not compared.
BGP best path selection compares MED only if paths come from the same AS. If the paths have different AS_PATH lengths, MED is ignored. The output shows two paths, but the path via 10.1.1.1 might have a different AS_PATH length. The 'bgp bestpath as-path multipath-relax' allows multipath but does not affect MED comparison. The higher metric path is chosen due to a different tie-breaker (e.g., lower neighbor IP).
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 path with lower MED is from a different AS, so MED is not compared.
Why this is correct
MED is only compared between paths from the same AS. The path via 10.1.1.1 might have a different AS_PATH.
- ✗
The route-map on R1 is misconfigured; it should set metric on the neighbor statement.
Why it's wrong here
Route-maps applied inbound are correct for setting MED.
- ✗
R2 has a higher local preference for the path via 10.1.1.4.
Why it's wrong here
Local preference is not shown; the output indicates metric is the only difference.
- ✗
The 'bgp bestpath as-path multipath-relax' command causes MED to be ignored.
Why it's wrong here
This command only affects multipath, not MED comparison.
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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.