JNCIS-ENT Spanning Tree Practice Question
When configuring MSTP, what purpose does the regional configuration digest serve?
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 allows neighboring switches to verify if they belong to the same MST region.
The configuration digest is an MD5 hash calculated from the region name, revision, and VLAN-to-instance mapping, included in BPDUs to verify that neighboring switches share the exact same region configuration.
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 encrypts the BPDU payload to prevent tampering by unauthorized access switches.
Why it's wrong here
The digest is for consistency checking, not encryption or security.
- ✓
It allows neighboring switches to verify if they belong to the same MST region.
Why this is correct
Switches compare the received digest with their own calculated digest to ensure region parameter consistency.
- ✗
It acts as a dynamic bridge priority modifier for internal instance root selection.
Why it's wrong here
Bridge priority is separate from the MST digest.
- ✗
It determines the Designated Master Bridge within the CIST instance.
Why it's wrong here
Master bridge selection relies on path cost and bridge IDs, not the MST digest.
Visual reference
About these practice questions
This JNCIS-ENT question is part of Courseiva's 519-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam 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 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.