JNCIP-ENT Ethernet Switching And Spanning Tree Practice Question
An enterprise network engineer needs to configure a trunk port on a Juniper EX Series switch running Junos OS to allow multiple VLANs while explicitly blocking VLAN 99. Which configuration statement under 'interfaces ge-0/0/1 unit 0 family ethernet-switching' correctly 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
✓
vlan-members except 99;
The 'vlan-members none' or explicitly listing allowed VLANs excludes unspecified ones, but to explicitly prune a VLAN while allowing others, the 'vlan-members except' option 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.
- ✗
exclude-vlan-members 99;
Why it's wrong here
The correct Junos keyword is 'except'.
- ✗
block-vlan 99;
Why it's wrong here
The block-vlan statement does not exist under family ethernet-switching.
- ✓
vlan-members except 99;
Why this is correct
Using 'vlan-members except' allows all other VLANs except the one specified.
- ✗
vlan-members [ vlan-members except 99 ];
Why it's wrong here
This syntax is invalid in Junos OS.
Visual reference
About these practice questions
One of 332 original JNCIP-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 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.