JNCIS-ENT Spanning Tree Practice Question
An administrator is configuring MSTP on a Junos device and needs to map VLANs 10 through 20 to MST instance 2. Which configuration hierarchy is required to achieve 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 configuration region-name Corp revision 1 instance 2 vlan 10-20
In Junos, MSTP region configuration parameters including VLAN mappings are defined under protocols mstp configuration.
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 vlans vlan-range 10-20 mst-instance 2
Why it's wrong here
MST mapping is performed under the protocols mstp hierarchy, not under the vlans configuration.
- ✗
set protocols msti instance-id 2 vlan-list 10-20
Why it's wrong here
msti is not the correct top-level configuration hierarchy for MSTP in Junos.
- ✗
set protocols rstp instance 2 vlan 10-20
Why it's wrong here
RSTP does not support multi-instance VLAN mappings; MSTP is required.
- ✓
set protocols mstp configuration region-name Corp revision 1 instance 2 vlan 10-20
Why this is correct
This command correctly maps VLANs 10 through 20 to instance 2 within the specified MST configuration block.
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 →
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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.