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802.1x

Not to be confused with 802.11x, which is the term used to describe the family of 802.11 standards for wireless LAN technology, 802.1X is the IEEE standard for port-based Network Access Control for enabling restricted use of IEEE 802 LAN service access points (ports) to secure communication between authenticated and authorized devices. 

See 802.11 for a complete overview of the 802.11x family of specifications.
Also see the "Wireless LAN Standards chart" in the Quick Reference section of Webopedia.
See also "How Wireless Networks Work" in the Did You Know... section of Webopedia.







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