What are the relationships among 802.11i, WPA, WPA2, PSK, 802.1X, TKIP, CCMP, and AES?

What are the relationships among 802.11i, WPA, WPA2, PSK, 802.1X, TKIP, CCMP, and AES?

 The 802.11i standard specifies security mechanisms for wireless networks.

·     WPA and WPA2 are two standards developed by the WiFi Alliance based on the draft of 802.11i before 802.11i was released.

·     PSK and 802.1X are two authentication methods for wireless networks. PSK is simple and is intended for personal use. 802.1X is complex, more secure, and is intended for enterprise use.

·     TKIP and CCMP are two encryption algorithms. AES is the core algorithm of CCMP and also the most secure encryption algorithm.