JNCIS-ENT Layer 2 Switching And VLANs Practice Question
An engineer is deploying Selective QinQ where customer inner VLAN tags must be preserved while the outer tag is swapped or added based on ingress port rules. Which Junos statement enables tag preservation?
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 interfaces ge-0/0/0 unit 0 family ethernet-switching input-vlan-map push
When configuring QinQ or VLAN translation, the 'pop' or 'swap' actions with tag preservation are managed via vlan-map configurations using stacking.
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 interfaces ge-0/0/0 unit 0 family ethernet-switching input-vlan-map pop
Why it's wrong here
Simply popping tags removes them rather than performing selective Q-in-Q mapping with preservation.
- ✓
set interfaces ge-0/0/0 unit 0 family ethernet-switching input-vlan-map push
Why this is correct
Correct. The push mapping action adds an outer tag while preserving the inner customer VLAN tag.
- ✗
set interfaces ge-0/0/0 unit 0 family ethernet-switching encapsulation qinq-transparent
Why it's wrong here
QinQ transparent mode passes all tagged traffic without outer tag manipulation.
- ✗
set interfaces ge-0/0/0 unit 0 family ethernet-switching vlan-translation preserve-inner
Why it's wrong here
VLAN translation syntax uses input-vlan-map and output-vlan-map rules.
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.