JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
You are troubleshooting a switching loop issue in an enterprise core utilizing MSTP. You run 'show mstp interface' and notice that a specific port is stuck in the discarding state for MSTI 1. Which command should you run to verify if root guard has been triggered on this port?
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
✓
show mstp interface detail
The command 'show mstp interface detail' provides detailed port-level status including whether root guard has tripped and placed the port into a inconsistent/discarding state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
show spanning-tree inconsistent-ports
Why it's wrong here
This is a Cisco IOS command syntax, not a Junos command.
- ✗
show bridge root-guard status
Why it's wrong here
This is a fictitious Junos operational command.
- ✓
show mstp interface detail
Why this is correct
In Junos, 'show mstp interface detail' displays comprehensive port state information including root guard status and inconsistent port flags.
- ✗
show ethernet-switching security-guard
Why it's wrong here
This command relates to port security features like MAC limiting or DHCP snooping, not spanning tree root guard.
About these practice questions
Courseiva writes every JNCIP-ENT question from scratch — 332 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.