The purpose of the virtual interface in a network context, particularly when discussing Wireless LAN Controllers (WLC) and Access Points (APs), is primarily associated with Management.
Here's a breakdown of the options:
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Routing: Not typically the primary function of a virtual interface; instead, routing is handled by routing protocols and devices.
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Redirecting clients to the WLC: While the virtual interface may assist with services that support client connections, its primary function isn't to redirect clients directly.
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Management: This is the correct answer, as the virtual interface allows for management communication between the WLC and APs, facilitating configuration and monitoring.
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Registering APs: While the virtual interface may be part of the process, registering access points is not its primary purpose but rather a function of the overall system.
So, the correct answer is Management.