350-401 Security Practice Question
A network administrator is deploying a Cisco Wireless LAN Controller (WLC) running AireOS in a branch office. The security policy requires that guest wireless clients be isolated from internal corporate clients and that guest traffic be tunneled back to a DMZ interface on the WLC. Which WLAN configuration element should the administrator use to meet these requirements?
⚠ Common exam trap
The trap here is assuming that creating a separate SSID or enabling Web Auth automatically isolates guest traffic, when the actual isolation comes from mapping the WLAN to a dedicated dynamic interface on a DMZ VLAN.
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
✓
Configure a dynamic interface mapped to the guest VLAN and assign it to the guest WLAN.
Guest wireless traffic on an AireOS WLC is isolated and tunneled by mapping the guest WLAN to a dynamic interface whose VLAN resides in a DMZ. The dynamic interface defines the VLAN and IP subnet for that WLAN, and the WLC forwards guest client traffic through that interface rather than the management interface. This design keeps guest clients off corporate VLANs and allows a firewall to enforce policy in the DMZ.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure the guest WLAN with AP group VLAN tagging and enable FlexConnect local switching.
Why it's wrong here
FlexConnect local switching terminates guest traffic at the branch access point rather than tunneling it to a DMZ interface on the WLC. This scenario explicitly requires guest traffic to be tunneled to a DMZ interface, so local switching at the AP would defeat the design. AP group VLAN tagging alone does not create a DMZ tunnel to the controller.
- ✗
Configure the guest WLAN to use the management interface with a separate SSID.
Why it's wrong here
The management interface on an AireOS WLC is used for in-band management and for terminating CAPWAP tunnels. Placing guest traffic on the management interface exposes the controller to guest clients and does not provide isolation from corporate traffic. A separate SSID alone does not separate the traffic path or provide DMZ termination.
- ✗
Configure the guest WLAN to use the virtual interface and enable Web Auth.
Why it's wrong here
The virtual interface on an AireOS WLC is an unconfigured, unroutable address used only to support web authentication redirects and DHCP relay for guest clients. It does not carry guest data traffic or provide a DMZ path. Enabling Web Auth alone does not isolate guest clients from internal corporate clients.
- ✓
Configure a dynamic interface mapped to the guest VLAN and assign it to the guest WLAN.
Why this is correct
A dynamic interface on the AireOS WLC is a user-defined VLAN interface that maps a WLAN to a specific VLAN and is commonly placed on a DMZ segment for guest traffic. Assigning the guest WLAN to a dynamic interface isolates guest clients from corporate clients on the management interface and allows traffic to be tunneled to a firewall in the DMZ.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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