Quick Answer
The answer is that WLAN 3 (IoT) is not operational because its status is listed as Disabled. This conclusion is drawn directly from the show wlan summary output, where the Status column indicates whether a WLAN is actively broadcasting and accepting client associations; a Disabled status means the WLAN profile exists on the controller but is not serving any wireless traffic, effectively making it non-operational. On the ENCOR 350-401 exam, interpreting this command tests your ability to quickly assess WLAN health and configuration from a single table, often as part of a broader troubleshooting scenario where a disabled WLAN is the root cause of missing SSIDs. A common trap is assuming a WLAN is working simply because it appears in the list, so always verify the Status column before checking Security or Interface details. Remember the mnemonic: “If it’s Disabled, it’s disabled—no clients, no broadcast.”
This 350-401 practice question tests your understanding of wireless infrastructure. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer runs the following command on a Cisco WLC:
WLC# show wlan summary
WLAN ID SSID Status Security Interface 1 Guest Enabled Open guest-vlan 2 Corporate Enabled WPA2 corp-vlan 3 IoT Disabled WPA2 iot-vlan 4 Management Enabled WPA2 mgmt-vlan
Based on this output, what can be concluded?
All WLANs are currently active and serving clients.
Why wrong: WLAN 3 is disabled.
WLAN 3 is not operational because it is disabled.
The Status column shows Disabled for WLAN 3.
The Guest WLAN uses WPA2 security.
Why wrong: The Guest WLAN uses Open security.
The Management WLAN is on the guest-vlan interface.
Why wrong: Management WLAN is on mgmt-vlan, not guest-vlan.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
WLAN 3 is not operational because it is disabled.
The output shows WLANs and their status. WLAN 3 (IoT) is disabled, meaning it is not broadcasting or accepting clients. The other WLANs are enabled.
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
For each option: why learners choose it and why it is or isn't the right answer here.
All WLANs are currently active and serving clients.
Why it's wrong here
WLAN 3 is disabled.
WLAN 3 is not operational because it is disabled.
Why this is correct
The Status column shows Disabled for WLAN 3.
Related concept
Access ports place end devices into a single VLAN.
The Guest WLAN uses WPA2 security.
Why it's wrong here
The Guest WLAN uses Open security.
The Management WLAN is on the guest-vlan interface.
Why it's wrong here
Management WLAN is on mgmt-vlan, not guest-vlan.
Common exam traps
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
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.
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
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.
What to study next
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.
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FAQ
Wireless Infrastructure — This question tests Wireless Infrastructure — Access ports place end devices into a single VLAN..
The correct answer is: WLAN 3 is not operational because it is disabled. — The output shows WLANs and their status. WLAN 3 (IoT) is disabled, meaning it is not broadcasting or accepting clients. The other WLANs are enabled.
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.
Access ports place end devices into a single VLAN.
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Last reviewed: Jun 18, 2026
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