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
A.阻塞
B.學(xué)習(xí)
C.丟棄
D.轉(zhuǎn)發(fā)
E.偵聽