What type of devices typically connect to a WAN through a port on AirPort Extremes?

The correct answer is that DSL modems and cable modems typically connect to a WAN through a port on AirPort Extremes. This is because AirPort Extremes are designed to function as wireless routers that manage network traffic in conjunction with a WAN connection. These routers typically have ports for connecting external devices such as DSL or cable modems, which provide the actual internet connection.

Other connected devices, such as computers, wireless devices, and smartphones, do not connect directly to the WAN through these ports; instead, they connect wirelessly or through other means to the AirPort Extreme itself, which then manages communication with the WAN via the connected modem. Therefore, understanding the function of the AirPort Extreme as a network hub highlights the importance of DSL and cable modems as the direct interface for WAN access.