JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
An enterprise network runs MSTP across an EX Series core. An administrator wants to ensure that a specific core port never becomes the root port for any MSTI, protecting the upstream core path. Which command achieves this?
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
✓
set protocols mstp interface ge-0/0/0 no-root-port
Root protection in MSTP is enabled via the 'no-root-port' or 'root-protection' statement under interface configuration in MSTP. In Junos, 'no-root-port' is used.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
set protocols mstp interface ge-0/0/0 no-root-port
Why this is correct
The 'no-root-port' statement ensures the interface is never selected as a root port.
- ✗
set protocols mstp interface ge-0/0/0 root-guard
Why it's wrong here
MSTP in Junos uses 'no-root-port' rather than 'root-guard' for this specific behavior.
- ✗
set protocols mstp interface ge-0/0/0 priority 0
Why it's wrong here
Setting priority to 0 makes the port more likely to be chosen as root, which is the opposite of protection.
- ✗
set protocols mstp interface ge-0/0/0 restrict-role root
Why it's wrong here
This is not a valid Junos CLI syntax.
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 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.