CompTIA Security+ All-in-One Exam Guide (Exam SY0-301), 3rd Edition, 3rd Edition

IEEE 802.1X

IEEE 802.1X is an authentication standard that supports communications between a user and an authorization device, such as an edge router. IEEE 802.1X is used by all types of networks, including Ethernet, token ring, and wireless. This standard describes methods used to authenticate a user prior to granting access to an authentication server, such as a RADIUS server. 802.1X acts through an intermediate device, such as an edge switch, enabling ports to carry normal traffic if the connection is properly authenticated. This prevents unauthorized clients from accessing the publicly available ports on a switch, keeping unauthorized users out of a LAN. Until a client has successfully authenticated itself to the device, only Extensible Authentication ...