An engineer must update the local web authentication details on a Cisco 5520 WLC. The engineer has one active SSID configured for web authentication and plans to update the virtual interface with a…

`config wlan create wlan_idname` is used to create a new WLAN (SSID) and is not related to configuring the virtual interface's IP address.

`config interface address virtual 1.1.1.1` uses a routable public IP address which is generally not recommended for the virtual interface; the `192.0.2.1` range is specifically reserved for documentation and examples and is commonly used for this non-routable purpose.

`config interface address dynamic-interface virtual 192.0.2.1` incorrectly includes `dynamic-interface`. The virtual interface is a distinct, static interface, not a dynamic one, and the correct command does not include `dynamic-interface`.

The `config interface address virtual <ip-address>` command is the correct syntax on a Cisco WLC to set the IP address for the virtual interface. This interface is specifically used for web authentication and VPN passthrough, typically assigned a non-routable IP like `192.0.2.1` as it doesn't participate in network routing but acts as a source for redirects.