JNCIS-ENT BGP Practice Question
Which THREE statements describe the role and function of the BGP Router ID? (Choose three)
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
✓
It is exchanged during the BGP OPEN message negotiation phase.
The Router ID is a 32-bit identifier chosen during startup, used as a tie-breaker in BGP path selection, and included in OPEN messages.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It automatically replaces the AS_PATH attribute if missing.
Why it's wrong here
AS_PATH can never be replaced by router ID.
- ✓
It is exchanged during the BGP OPEN message negotiation phase.
Why this is correct
The router ID is communicated in the OPEN message.
- ✓
It is used as a final tie-breaker in the BGP path selection algorithm.
Why this is correct
Lowest router ID is used when all other path selection criteria result in a tie.
- ✗
It must be identical across all routers within the same Autonomous System.
Why it's wrong here
Router IDs must be unique within an AS to prevent session collisions.
- ✓
It is a 32-bit identifier represented in dotted-quad notation.
Why this is correct
Router ID is a 32-bit value structured like an IPv4 address.
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 JNCIS-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 JNCIS-ENT exam.