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300-410 Practice Question: Which BGP attribute is considered 'well-known…
Which BGP attribute is considered 'well-known mandatory' and must be present in all BGP update messages?
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 is well-known mandatory, meaning it must be included in all BGP updates. Other well-known mandatory attributes include NEXT_HOP and ORIGIN.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
LOCAL_PREF
Why it's wrong here
LOCAL_PREF is well-known discretionary, not mandatory.
- ✓
AS_PATH
Why this is correct
Correct. AS_PATH is well-known mandatory.
- ✗
MED
Why it's wrong here
MED is optional non-transitive.
- ✗
COMMUNITY
Why it's wrong here
COMMUNITY is optional transitive.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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