2. 计算机
  3. Which two statements about using the CHAP authentication mechanism in a PPP link are true?

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

admin2019-04-08  13
问题 Which two statements about using the CHAP authentication mechanism in a PPP link are true?
选项 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
答案B,E
解析 PAP是两次握手机制；CHAP通过3次握手，CHAP定期发出挑战，以确保远程节点有有效的密码，CHAP采用MD5加密算法，而PAP采用明文。
A．CHAP认证采用的是两次握手机制
B．CHAP的认证是链路建立之后周期性发生的
C．CHAP认证没有重放攻击的保护
D．执行CHAP认证只是在链路建立的时候
E．CHAP认证采用的三次握手机制
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