The correct answer is that the AP will use VLAN 10 for management traffic and VLANs 20 and 30 for client traffic. This configuration on the AP’s Ethernet port defines a trunk link where the native VLAN carries untagged management frames, while the allowed VLANs carry tagged client data. In the Cisco 9800 WLC context, the AP’s wired interface behaves like a switchport, separating control-plane traffic (management) from data-plane traffic (client SSIDs). On the ENCOR 350-401 exam, this tests your understanding of AP-to-switch connectivity and VLAN segmentation, often appearing in a multiple-choice scenario where a common trap is confusing the native VLAN with a client VLAN or assuming all VLANs carry management traffic. Remember the key distinction: the native VLAN is always for management, and the allowed VLAN list is for client traffic—think “native for admin, allowed for access.”
350-401 Wireless Infrastructure Practice Question
This 350-401 practice question tests your understanding of wireless infrastructure. 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.
Given the following snippet from a Cisco 9800 WLC:
ap ethernet-port default-ethernet-port
description "Default Ethernet Port"
mode trunk
allowed vlan 10,20,30
native vlan 10
What is the effect of this configuration on the AP?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The AP will use VLAN 10 for management traffic and VLANs 20 and 30 for client traffic.
The Ethernet port configuration on an AP defines how the AP's wired interface handles VLANs, typically for management and client traffic.
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.
✗
The AP's Ethernet port will tag all traffic with VLAN 10.
Why it's wrong here
The native VLAN is untagged; only allowed VLANs are tagged.
✓
The AP will use VLAN 10 for management traffic and VLANs 20 and 30 for client traffic.
Why this is correct
Native VLAN is typically for management; other VLANs are for client data.
Related concept
Access ports place end devices into a single VLAN.
✗
The AP will only allow VLAN 10 traffic.
Why it's wrong here
The 'allowed vlan' command permits multiple VLANs.
✗
The AP's Ethernet port is configured as an access port.
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.
Trap categories for this question
Command / output trap
The 'allowed vlan' command permits multiple VLANs.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
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 350-401 questions on switching, trunking, and access-port configuration.
Wireless Infrastructure — This question tests Wireless Infrastructure — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: The AP will use VLAN 10 for management traffic and VLANs 20 and 30 for client traffic. — The Ethernet port configuration on an AP defines how the AP's wired interface handles VLANs, typically for management and client traffic.
What should I do if I get this 350-401 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 350-401 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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