JNCIS-ENT Spanning Tree Practice Question
An enterprise network uses MSTP. What is the function of the Internal Root in an 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
✓
It acts as the root switch for a specific MSTI within the local MST region.
The Internal Root is the switch within a specific MST instance that has the lowest path cost to the regional root or CIST root, serving as the root for that particular MSTI within the region.
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 acts as the root switch for a specific MSTI within the local MST region.
Why this is correct
Each MSTI has an internal root responsible for path calculations inside the region.
- ✗
It translates MST BPDUs into legacy STP BPDUs at the regional boundary.
Why it's wrong here
Boundary ports handle translation, not the internal root.
- ✗
It manages the CIST instance across all connected foreign MST regions.
Why it's wrong here
The CIST root manages inter-region communication, while internal roots handle intra-region instance paths.
- ✗
It serves as the sole bridge responsible for generating the MST configuration digest.
Why it's wrong here
The digest is statically configured by the administrator on all switches, not generated dynamically by an internal root.
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.