Which two statements about using the CHAP authentication mechanism in a PPP link are true?（）A、CHAP uses a two-way handshakeB、CHAP authentication periodically occurs after link establishmentC、CHAP has no protection from playback attacksD、CHAP authentication is performed only upon link establishmentE、CHAP uses a three-way handshakeF、CHAP authentication passwords are sent in plaintext
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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