Which two functions does a WLC perform in a lightweight AP architecture that an autonomous AP performs itself?

In a lightweight AP architecture, the Wireless LAN Controller (WLC) centralizes many functions that an autonomous AP performs independently. The WLC manages RF channels, including transmit power, to optimize wireless coverage and minimize interference across multiple APs. It also handles client association, authentication (e.g., 802.1X), and seamless roaming between APs, offloading these resource-intensive tasks from individual APs. Autonomous APs, conversely, manage these functions locally. Sending and processing beacon frames is a fundamental function of both autonomous and lightweight APs. Encrypting/decrypting traffic for the WAP protocol family is a client-side function, not an AP or WLC function. Preventing collisions between wireless clients on the same RF channel is primarily handled by the CSMA/CA mechanism at the MAC layer, which is inherent to the wireless standard and performed by the AP, not exclusively the WLC.