On a Cisco 5520 WLC with one web-auth SSID, which command sets the virtual interface to the nonroutable IP 192.0.2.1?
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Correct answer: config interface address virtual 192.0.2.1.
Why this is the answer
The command config interface address virtual 192.0.2.1 correctly sets the virtual interface IP address on a Cisco WLC. The virtual interface is a mandatory logical interface used for web authentication, guest access, and VPN passthrough, and it requires a non-routable IP address like 192.0.2.1. The option config interface address dynamic-interface virtual 192.0.2.1 is incorrect because dynamic-interface is used for dynamic interfaces, not the global virtual interface. The option config wlan create wlanidname creates a WLAN, but does not configure the virtual interface IP. The option config interface address virtual 1.1.1.1 uses a routable IP address, which is not recommended for the virtual interface.
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