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An IEEE standard for network access control. Used predominantly in Wi-Fi wireless networks, 802.1X keeps the network port disconnected until authentication is completed. Depending on the results, the port is either made available to the user, or the user is denied access to the network.

Supplicant - Authenticator - Server
The client desiring access to a network is called the "supplicant." The device that provides the network port to the client is the "authenticator." In a wireless network, the authenticator is in the access point (AP). In a dial-up network, the authenticator is in the network access server (NAS). The device that contains usernames and passwords and authorizes the user is the "authentication server." In small networks, the authentication server can be located in the same unit as the authenticator.

802.1X uses the Extensible Authentication Protocol (EAP) for passing authentication messages. EAP comes from the dial-up environment, but "EAP Over LAN" (EAPOL) was created for packet networks such as Ethernet. 802.1X uses EAPOL to start and end the authentication session and pass EAP messages between the supplicant and authenticator and from the supplicant to the authentication server (via the authenticator). EAP messages from the authenticator to the authentication server typically use the RADIUS protocol. See EAP.

An 802.1X Network
The 802.1X protocol resides in the access point (the "authenticator"). The protocol keeps the port open until it receives authorization from an authentication server.
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References in periodicals archive ?
The joint solution, named Alice WLAN, will provide unmatched security functionality by supporting the latest security standard 802.1x and SIM-based authentication.
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It also features 802.1x authentication and (WPA-PSK/WPA2-PSK) wireless security mechanisms for network protection and has a standard antenna which can be replaced with a reverse SMA connector type by the user.
It provides 802.1x security, Wi-Fi Protected Access and is 802.l li ready.--Intermec Technologies
Also included is port-based network access control based on the IEEE 802.1x network login standard which reportedly ensures that only authorised users gain access to network resources.
The switch provides a full 15.4 watts on all 24 ports, and offers 802.1X and RADIUS network login to control port-based access for authentication and accountability.
Network administration and communications tools supplier Network Utilities has launched version 1.3 of its Odyssey Client for Pocket PC, an 802.1X access client for secure wireless connections.
Advanced authentication and encryption security features include WPA, 802.1x authentication, support for FUNK Odyssey and Microsoft RADIUS Server, and RADIUS MAC address authentication.--SMC Networks
Standard security features include IEEE 802.1x user authentication and Wi-Fi protected access.
They are based on the IEEE security standard 802.1x and offer data privacy and security over a wireless link as well as secure authentication, according to the company.
For enhanced, interoperable wireless network security, IEEE 802.1x user-based authentication and Wi-Fi protected access and dynamic 108-Mbps mode will be available via a free firmware upgrade.--Netgear