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300-410 Practice Question: Which BGP attribute is used for loop prevention…
Which BGP attribute is used for loop prevention in eBGP?
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
✓
AS_PATH
The AS_PATH attribute contains the list of AS numbers a route has traversed. If a BGP router receives a route with its own AS number in the AS_PATH, it discards the route to prevent loops.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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NEXT_HOP
Why it's wrong here
NEXT_HOP indicates the next-hop IP address, not used for loop prevention.
- ✗
LOCAL_PREF
Why it's wrong here
LOCAL_PREF is used for best path selection within an AS, not for loop prevention.
- ✓
AS_PATH
Why this is correct
AS_PATH is used to detect loops by checking if the local AS is already in the path.
- ✗
MED
Why it's wrong here
MED is used to influence inbound traffic, not for loop prevention.
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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.