PPP中的安全认证协议是（ ） ，它使用三次握手的会话过程传送密文。
- A.MDS
- B.PAP
- C.CHAP
- D.NCP
正确答案及解析
正确答案
解析
①安全认证介绍 1)PPP的NCP可以承截多种协议的三层数据包。2)PPP使用LCP控制多种链路的参数 ( 建立、认证、压缩、回拨 ) 。 ② PPP的认证类型 1)PPP的pap认证是通过二次握手建立认证 ( 明文不加密 ) 。 2)PPP的chap挑战握手认证协议，通过三次握手建立认证( 密文采用 MEDS 加密 ) 。 3)PPP的双向验证，采用的是chap的主验证风格。4)PPP的加固验证，采用的是两种 (pap 、 chap) 验证同时使用。
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