- A
Create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then commit, then verify
This is the correct order because you must first define the VLAN before assigning interfaces to it, then commit to apply changes, and finally verify the configuration.
- B
Configure interface as access port and assign VLAN, then create VLAN under 'vlans' hierarchy, then commit, then verify
Why wrong: This is incorrect because you cannot assign an interface to a VLAN that hasn't been created yet; Junos will reject the configuration.
- C
Create VLAN under 'vlans' hierarchy, then commit, then configure interface as access port and assign VLAN, then verify
Why wrong: This is incorrect because committing before assigning the interface leaves the VLAN unused and incomplete; the interface must be assigned before commit.
- D
Commit, then create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then verify
Why wrong: This is incorrect because committing with an empty configuration does nothing; changes must be staged before commit.
Junos VLAN Configuration on EX Series — Steps | JNCIA-Junos Explained
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Order the steps to configure a VLAN on an EX Series switch running Junos.
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
Create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then commit, then verify
VLANs are created under 'vlans' hierarchy, then interfaces are assigned as access ports. Commit and verify.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then commit, then verify
- ✗
Configure interface as access port and assign VLAN, then create VLAN under 'vlans' hierarchy, then commit, then verify
Why it's wrong here
This is incorrect because you cannot assign an interface to a VLAN that hasn't been created yet; Junos will reject the configuration.
- ✗
Create VLAN under 'vlans' hierarchy, then commit, then configure interface as access port and assign VLAN, then verify
Why it's wrong here
This is incorrect because committing before assigning the interface leaves the VLAN unused and incomplete; the interface must be assigned before commit.
- ✗
Commit, then create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then verify
Why it's wrong here
This is incorrect because committing with an empty configuration does nothing; changes must be staged before commit.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related JNCIA-JUNOS questions on switching, trunking, and access-port configuration.
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
Junos Configuration Basics — This question tests Junos Configuration Basics — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Create VLAN under 'vlans' hierarchy, then configure interface as access port and assign VLAN, then commit, then verify — VLANs are created under 'vlans' hierarchy, then interfaces are assigned as access ports. Commit and verify.
What should I do if I get this JNCIA-JUNOS question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related JNCIA-JUNOS questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 11, 2026
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