JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
You are designing an enterprise network running Multiple Spanning Tree Protocol (MSTP) across multiple data center switches. To ensure that switches belong to the same MST region, which three parameters must match identically across all switches in that 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
According to IEEE 802.1s, switches belong to the same MST region if and only if they share the exact same 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.
- ✓
Region name, revision number, and VLAN-to-instance mapping
Why this is correct
Name, revision, and VLAN-to-instance mapping are the three mandatory parameters that define an MST region.
- ✗
VLAN-to-instance mapping, bridge priority, and MAC address
Why it's wrong here
Bridge priority and MAC address are local or elected values, not part of the static region configuration identifier.
- ✗
Bridge priority, region name, and maximum age timer
Why it's wrong here
Bridge priority and timers do not define region boundaries; only the configuration digest parameters do.
- ✗
Root bridge ID, region name, and revision number
Why it's wrong here
Root bridge ID is dynamically elected and does not dictate MST region boundaries.
Visual reference
About these practice questions
One of 336 original JNCIP-ENT practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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.