JNCIP-ENT BGP Advanced Practice Question
An enterprise is designing a BGP confederation to reduce iBGP mesh complexity across multiple data centers. Which statement is correct regarding how confederation members interact with BGP attributes?
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
✓
Sub-AS numbers are preserved in AS_CONFED_SEQUENCE segments inside the confederation but are replaced by the confederation identifier when advertising to external peers.
Within a BGP confederation, sub-AS numbers are stripped as routes leave the confederation and are replaced by the confederation identifier. However, within the confederation, sub-AS numbers are kept in the AS_CONFED_SEQUENCE and AS_CONFED_SET path segments to prevent loops, and MED/Local Preference are preserved across member sub-AS boundaries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Confederations eliminate the need for any internal iBGP peering within the member sub-ASes.
Why it's wrong here
Each member sub-AS still requires an iBGP mesh or its own route reflectors internally.
- ✗
The next-hop IP address is always modified when routes are passed between member sub-ASes within the confederation.
Why it's wrong here
By default, iBGP next-hop behavior is preserved across sub-AS boundaries unless explicitly altered with next-hop-self.
- ✗
Local Preference is automatically reset to zero whenever a route crosses a sub-AS boundary inside a confederation.
Why it's wrong here
Local Preference is propagated across sub-AS boundaries within a confederation just like standard iBGP.
- ✓
Sub-AS numbers are preserved in AS_CONFED_SEQUENCE segments inside the confederation but are replaced by the confederation identifier when advertising to external peers.
Why this is correct
Confederation member AS numbers are encapsulated in confederation-specific path segments internally and hidden from external peers.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
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