What are wireless controllers and why are they important in WLANs?
What will be an ideal response?
Wireless controllers are devices that incorporate most of the functions of an AP but do not have any radios. They connect to multiple, less-complex APs either via direct cable connection or, for remote locations, via a logical network connection. These simpler APs consist of PHY-layer devices (radios) with some MAC-layer functionality. The wireless controller handles the interface and communications with the wired LAN and most of the MAC-layer functionality. This way, the management of a WLAN is effectively centralized. The network administrator configures the WLAN on the wireless controller, including the parameters of the radios, and the configuration is then pushed to the APs. If an AP fails, the controller is able to adjust the transmit power on two nearby APs to restore signal coverage to the area previously served by the failed AP.
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