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IEEE 802.1X
IEEE standard for port-based network access control
IEEE 802.1X
IEEE 802.1X is an IEEE Standard for port-based network access control. It is part of the IEEE 802.1 group of networking protocols. It provides an authentication mechanism to devices wishing to attach to a LAN or Wireless LAN. The standard directly addresses an attack technique called Hardware Addition where an attacker posing as a guest, customer or staff smuggles a hacking device into the building that they then plug into the network giving them full access. A notable example of the issue occurred in 2005 when a machine attached to Walmart's network hacked thousands of their servers. IEEE 802.1X defines the encapsulation of the Extensible Authentication Protocol (EAP) over wired IEEE 802 networks and over 802.11 wireless networks, which is known as "EAP over LAN" or EAPOL. EAPOL was originally specified for IEEE 802.3 Ethernet, IEEE 802.5 Token Ring, and FDDI (ANSI X3T9.5/X3T12 and ISO 9314) in 802.1X-2001, but was extended to suit other IEEE 802 LAN technologies such as IEEE 802.11...
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