How an AP connects to a switch

An Access Point (AP) connects to a switch using an Ethernet cable, which provides both data and often power, and the switch port can be configured as an access or trunk port depending on VLAN requirements.Physical ConnectionAn AP physically connects to a switch via an Ethernet cable. In enterprise setups, this connection often uses Power over Ethernet (PoE), allowing the AP to receive both power and network connectivity through a single cable. Alternatively, APs can use a separate power adapter, though this is less common in professional deployments .Switch Port ConfigurationAccess Port: Carries traffic for a single VLAN. This is typically used when the AP serves clients from one VLAN, such as a corporate employee network .Trunk Port: Carries traffic for multiple VLANs simultaneously using 802.1Q tagging. This is used when an AP broadcasts multiple SSIDs mapped to different VLANs, such as separating guest and employee networks . For most controller-based APs in local mode, connecting to an access port is sufficient, while autonomous APs that handle multiple VLANs may require a trunk port .Interaction with Wireless LAN Controllers (WLC)In lightweight AP deployments, the AP does not manage itself. Instead, it connects to a Wireless LAN Controller (WLC) via the switch. The AP establishes a CAPWAP tunnel to the WLC, which includes:Control Tunnel: For management and configurationData Tunnel: For user traffic The WLC can be connected to the network backbone or core switch, while the AP forwards traffic through the switch to the WLC .VLAN and SSID MappingEach AP can broadcast multiple SSIDs, which are mapped to VLANs. The switch port configuration ensures that traffic from each SSID is correctly tagged and forwarded to the appropriate VLAN. For single-SSID APs, a simple access port is sufficient, while multi-SSID APs may require trunk ports to carry multiple VLANs .VerificationAfter connecting the AP to the switch and configuring VLANs and SSIDs, verify connectivity by connecting a wireless client to the AP and ensuring it receives an IP address from the correct VLAN and can access network resources . This setup allows seamless integration of wireless clients into the wired LAN, providing both network access and centralized management through the WLC.