JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
An administrator implements MSTP (Multiple Spanning Tree Protocol) in a large data center using Juniper switches. Region boundaries must be maintained strictly. Which three parameters must match identically across all switches for them to be considered part of the same MST region?
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
✓
Region name, revision number, and VLAN-to-instance mapping
MST region configuration requires identical configuration name, revision number, and VLAN-to-instance mapping table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
MAC address, revision number, and region name
Why it's wrong here
Base MAC addresses are unique to each hardware device and never match.
- ✓
Region name, revision number, and VLAN-to-instance mapping
Why this is correct
These three parameters form the MST configuration digest and must be identical.
- ✗
Bridge priority, hello time, and max age
Why it's wrong here
Timer and priority values can differ between switches within the same region.
- ✗
Extended system ID, region name, and forward delay
Why it's wrong here
Forward delay and timers are bridge-specific parameters, not region parameters.
Visual reference
About these practice questions
Courseiva writes every JNCIP-ENT question from scratch — 336 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.