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300-410 Practice Question: Which BGP loop prevention mechanism relies on the…
Which BGP loop prevention mechanism relies on the AS_PATH attribute?
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 loop detection
BGP uses AS_PATH loop detection: a router rejects a route if its own AS number appears in the AS_PATH.
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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Split horizon
Why it's wrong here
Split horizon is used in distance vector protocols like RIP, not BGP.
- ✓
AS_PATH loop detection
Why this is correct
Correct. BGP discards routes with its own AS in the AS_PATH.
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TTL expiration
Why it's wrong here
TTL is used in IP, not specifically for BGP loop prevention.
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Route poisoning
Why it's wrong here
Route poisoning is used in RIP, not BGP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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