JNCIS-ENT Spanning Tree Practice Question
You notice that an access switch running RSTP is continually dropping user traffic because a connected end-user device is sending inferior BPDUs that trigger topology changes. Which Juniper feature should you configure on the access ports to protect against this behavior?
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 rstp interface ge-0/0/1.0 bpdu-protection
BPDU protection (bpdu-protection) on Junos edge ports puts the port in an error-disabled state if any BPDU is received, preventing unauthorized switches or loops.
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 rstp interface ge-0/0/1.0 loop-protection
Why it's wrong here
Loop protection guards against loss of BPDU transmission on point-to-point links.
- ✓
set protocols rstp interface ge-0/0/1.0 bpdu-protection
Why this is correct
Enabling bpdu-protection on edge ports shuts down the port if a BPDU is received, protecting against rogue devices.
- ✗
set protocols rstp interface ge-0/0/1.0 root-protection
Why it's wrong here
Root protection protects the root port from losing its role, not edge ports from end devices.
- ✗
set protocols rstp interface ge-0/0/1.0 no-root-port
Why it's wrong here
no-root-port is not a valid Junos CLI syntax for RSTP.
Visual reference
About these practice questions
One of 519 original JNCIS-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 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.