JNCIS-ENT Layer 2 Switching And VLANs Practice Question
An administrator is configuring Selective QinQ on an EX Series switch using VLAN translation. Which THREE components are required to successfully rewrite inner and outer VLAN tags? (Choose three.)
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
✓
Ensuring upstream transit ports are configured as trunks carrying the outer service VLAN.
Selective QinQ translation requires flexible VLAN tagging, input/output vlan mapping profiles, and trunk connectivity for the provider backbone.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disabling all Layer 2 learning on the translation interface.
Why it's wrong here
MAC learning remains functional for bridging translated frames.
- ✗
Enabling OSPFv3 routing directly on the customer edge interface unit 0.
Why it's wrong here
Q-in-Q translation is Layer 2 bridging and does not require OSPFv3.
- ✓
Ensuring upstream transit ports are configured as trunks carrying the outer service VLAN.
Why this is correct
Correct. Upstream transit requires trunking the mapped outer VLAN.
- ✓
Configuring input-vlan-map and output-vlan-map rules to push/pop or swap tags.
Why this is correct
Correct. VLAN maps define the translation behavior.
- ✓
Enabling flexible-vlan-tagging on the edge interface.
Why this is correct
Correct. Flexible tagging is mandatory for tag manipulation.
Visual reference
About these practice questions
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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.