Currently, the Wireless Network Security standards and protocols are fall into 3 categories:
It use to ensures privacy of data transmitted through the air
It can be done at Layer 2 (WPA2, WPA, WEP, TKIP, AES) or Layer 3 (VPN)
It can ensures that only authorized users with proper credentials are allowed to use the network such as security certificate or LDAP matching attribute (login and password).
Authentication methods include EAP, captive portal, VPN
Provides a policy enforcement structure to control the traffic of authorized users, including networks, bandwidth, time of day, and protocols. Some solutions preferred to integrate with Network Access Control (NAC) supported appliance for managing the access control.