802.1x

network standard for medium access (does not refer to 802.11 only)

Port-based access control, a client is authenticated to an AP using authentication server (RADIUS, TACACS+)

At the beginning, clients are authenticated to AP, their communication depends on the authentication to EAP server

For achieving a complex security there is inevitable to combine 802.1x with:

1. Dynamic (per-session) WEP keys

2. (Per Packet Keying, TKIP, MIC, Broadcast key rotation) = 802.11i

3. Securing on higher layers (SSH, SSL protocols)