Cisco Systems AIR-CT3504-K9 Wireless LAN Controller

The Cisco AIR-CT3504-K9 Wireless LAN Controller is a scalable 802.11ac centralized controller that manages wireless access points across enterprise networks, such as offices, campuses, and distributed environments. It ships with a 3-AP license and supports up to 150 APs (with additional licenses) and up to 3,000 clients, providing centralized control, policy enforcement, and visibility. The device offers 4x Gigabit Ethernet ports for wired connections and a 1x Multigigabit Ethernet uplink, plus management via Web GUI, CLI, Cisco Mobility Express, and Cisco Prime Infrastructure. Security features include WPA2/WPA3, 802.1X, and rogue AP detection, while mobility and RF management enable seamless roaming and centralized spectrum control. Its form factor is desktop or rack-mountable, and it uses an external AC adapter for power. Common replacements include Cisco C9800-L-C-K9 and AIR-CT2504-K9, reflecting its role in mid-to-large scale WLAN deployments where scalable licensing can be expanded as needed.