JNCIP-ENT BGP Advanced Practice Question
When configuring a BGP confederation, how are external peers outside the confederation affected by the internal sub-AS structure?
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
✓
They see only the top-level confederation AS number in the AS path attribute.
External peers outside the confederation see only the top-level confederation AS number, as internal member AS numbers are stripped when exiting the confederation boundary.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
They require explicit configuration of every member AS in their own EBGP import filters.
Why it's wrong here
External peers do not need knowledge of internal confederation member ASNs.
- ✗
They see all member AS numbers prepended individually in the AS path.
Why it's wrong here
Internal member AS numbers are hidden from external peers.
- ✓
They see only the top-level confederation AS number in the AS path attribute.
Why this is correct
Confederation encapsulation hides internal sub-AS routing details from external ASNs.
- ✗
They reject all updates originating from a confederation due to AS path validation failures.
Why it's wrong here
External peers successfully accept routes because the confederation presents a valid single top-level ASN.
About these practice questions
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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
This JNCIP-ENT practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIP-ENT exam.