JNCIP-ENT BGP Advanced Practice Question
When designing a BGP confederation architecture, which TWO rules govern how sub-AS numbers and attributes behave across confederation boundaries? (Choose two)
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 included in AS_CONFED_SEQUENCE attributes and are stripped when exiting the confederation.
Confederations use AS_CONFED_SEQUENCE and AS_CONFED_SET segments to track internal paths, and strip them when advertising to external peers outside the confederation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Sub-AS numbers are included in AS_CONFED_SEQUENCE attributes and are stripped when exiting the confederation.
Why this is correct
Confederation member ASNs are encapsulated in AS_CONFED segments and stripped at the outer boundary.
- ✓
External peers outside the confederation treat the confederation as a single autonomous system.
Why this is correct
External peers see only the confederation's top-level AS number.
- ✗
BGP multipath cannot be enabled across different member ASNs within the same confederation.
Why it's wrong here
Multipath can operate across confederation member boundaries if configured properly.
- ✗
MED values are automatically removed across member AS boundaries regardless of configuration.
Why it's wrong here
MED values can be preserved across member AS boundaries.
- ✗
Local preference is discarded when passing routes between different member ASNs inside the confederation.
Why it's wrong here
Local preference is preserved across member AS boundaries within the confederation.
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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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