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多项选择题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

  • B,E

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