WPA/WPA2 Enterprise

WPA has an incomplete pre-standard implementation of the enterprise profile so WPA2 enterprise really should be the only serious consideration if pre-shared key is inadequate.
- Cisco didn't help the situation any by implementing an early incomplete and not very secure variant in Cisco CCX (Cisco certified extensions) based on mschap called Cisco LEAP.
WPA2 uses the IETF EAP (Extensible Authentication Protocol) for which there are an number of plugin authentication modules.

WPA has an incomplete pre-standard implementation of the enterprise profile so WPA2 enterprise really should be the only serious consideration if pre-shared key is inadequate.