多項(xiàng)選擇題

Which two statements about using the CHAP authentication mechanism in a PPP link are true?()

A.CHAP uses a two-way handshake
B.CHAP authentication periodically occurs after link establishment
C.CHAP has no protection from playback attacks
D.CHAP authentication is performed only upon link establishment
E.CHAP uses a three-way handshake
F.CHAP authentication passwords are sent in plaintext

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