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