CCNA Objective 1.1.e covers wireless controllers, the brains that manage all your access points from one place. Instead of logging into every AP by hand, a WLC lets you configure once and push settings everywhere. It handles authentication, power, channels, and even client roaming, so you can walk from one side of a building to another without dropping your connection. On the CCNA exam, if you see a question about simplifying Wi-Fi management or seamless roaming, think controller-based design. #