CCNA FAQ: Point-to-Point WANs (Wide Area Network Connections) Question: Which of the following PPP authentication protocols authenticates a device on the other end of a link without sending any password information in clear text? a. MD5 b. PAP c. CHAP d. DES Answer: C. Of the possible answers, only PAP and CHAP are PPP authentication protocols. PAP sends the password as … [Read more...]