JNCIS-ENT Layer 2 Switching And VLANs Practice Question
You are configuring a trunk port on an EX Series switch and need to specify that untagged frames received on this port should be placed into VLAN 10. Which command accomplishes 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 interfaces ge-0/0/10 unit 0 family ethernet-switching interface-mode trunk native-vlan-id 10
The native VLAN on an EX switch trunk port is configured using the 'native-vlan-id' statement under the interface ethernet-switching hierarchy.
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-id 10 native-port ge-0/0/10
Why it's wrong here
Native port mapping is configured under the interface hierarchy, not the global VLAN configuration.
- ✗
set interfaces ge-0/0/10 unit 0 family ethernet-switching untagged-vlan 10
Why it's wrong here
The correct keyword for untagged frames on a trunk is native-vlan-id.
- ✓
set interfaces ge-0/0/10 unit 0 family ethernet-switching interface-mode trunk native-vlan-id 10
Why this is correct
Correct. The native-vlan-id parameter handles untagged frames on trunk interfaces.
- ✗
set interfaces ge-0/0/10 unit 0 family ethernet-switching default-vlan 10
Why it's wrong here
The 'default-vlan' statement does not exist in Junos Ethernet switching.
Visual reference
About these practice questions
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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.