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The EAP: MD5,TLS,TTLS,PEAP uses the TKIP in WPA? ..and LEAP?

EAP-MD5 specifies only authentication, not data encryption.

EAP-TLS, -TTLS, -PEAP, and -LEAP may all use 802.1X/EAP (pre-WPA), WPA (TKIP), or WPA2 (AES-CCMP) as the enryption mechanism.

Devinator

Which is the difference: 802.1X/EAP(pre-WPA) vs WPA(TKIP)?

The difference is in when, where, and how the encryption keys are generated and distributed among the supplicant, authenticator, and authentication server.

It is an obligation to utilize the TKIP(and not WEP) in WPA?

http://www.wi-fi.com/OpenSection/pdf/WFA_02_27_05_WPA_WPA2_White_Paper.pdf