350-501 Networking Practice Question
In a BGP confederation, which AS number is used in the AS_PATH to prevent loops within the confederation?
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
✓
Private AS numbers (64512-65535)
Confederation uses private AS numbers (from 64512 to 65535) for sub-ASs, and these are prepended to the AS_PATH but not shown to external peers.
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 same AS number as the confederation ID
Why it's wrong here
Confederation ID is a single public AS number seen externally.
- ✓
Private AS numbers (64512-65535)
Why this is correct
Private AS numbers are used within the confederation.
- ✗
Public AS numbers
Why it's wrong here
Public AS numbers are for eBGP peers outside the confederation.
- ✗
No AS number is prepended
Why it's wrong here
Sub-AS numbers are prepended.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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