Extensible Authentication Protocol. A protocol that provides an authentication framework for both wireless and wired Ethernet enterprise networks. It is typically used with a RADIUS server to authenticate users on large networks. EAP protocol types are used in the 802.1X-based authentication in WPA-Enterprise and WPA2-Enterprise. (See 802.1X, EAP, LEAP, RADIUS, TLS, WPA-Enterprise, WPA2-Enterprise).