JNCIS-ENT Spanning Tree Practice Question
You need to ensure that a core switch retains its position as the root bridge even if a new switch with a manually lowered bridge priority is added to the network. Which feature should you configure on the core switch's ports facing the downstream switches?
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
✓
Root protection
Root protection prevents a designated port from becoming a root port, ensuring that if a superior BPDU arrives on that port, the port transitions to a root-inconsistent (discarding) state rather than yielding the root role.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Loop protection
Why it's wrong here
Loop protection checks for missing BPDUs, not superior BPDUs.
- ✗
BPDU guard
Why it's wrong here
BPDU guard shuts down the port when any BPDU is received, which would break valid core uplinks.
- ✓
Root protection
Why this is correct
Root protection enforces that the designated root port stays designated, rejecting superior BPDUs.
- ✗
Edge port configuration
Why it's wrong here
Edge port configuration is meant for end-device access ports.
Visual reference
About these practice questions
Courseiva writes every JNCIS-ENT question from scratch — 506 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 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.