hardMultiple ChoiceObjective-mapped
300-410 Is troubleshooting a multi-homed BGP setup Practice Question
A network engineer is troubleshooting a multi-homed BGP setup. R1 receives the prefix 10.1.1.0/24 from two eBGP peers: R2 (AS 100) and R3 (AS 200). The engineer configures the distance bgp 20 20 20 command on R1 to make all BGP routes have the same AD. However, R1 still prefers the route from R2 over R3. What is the most likely reason?
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 from R2 has a higher local preference than the route from R3.
The distance bgp command sets AD for eBGP, iBGP, and local routes. With AD equal, the router uses other BGP path attributes, such as local preference, AS path length, or MED. The most common tie-breaker is local preference (default 100) or the oldest route.
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 from R2 has a lower MED than the route from R3.
Why it's wrong here
MED is compared after local preference and AS path; if all are equal, MED could be a factor, but the question implies a more fundamental attribute is different.
- ✓
The route from R2 has a higher local preference than the route from R3.
Why this is correct
Local preference is compared before AS path and MED; if R2's route has a higher local preference (e.g., 150 vs 100), it will be preferred even with equal AD.
- ✗
The route from R2 is the oldest BGP route.
Why it's wrong here
The oldest route is a tie-breaker only if all other attributes are equal; local preference is compared first.
- ✗
The AS path for the route from R2 is shorter than that from R3.
Why it's wrong here
AS path length is compared after local preference; if local preference differs, AS path is not considered.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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