Which of the following PPP authentication protocols never sends a password in the clear? 06/14/2017 – by Mod_GuideK 0 Which of the following PPP authentication protocols never sends a password in the clear? A. PAM B. PAP C. PGP D. CHAP SHOW ANSWERSCorrect Answer: D Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.