Cisco Certification: Configuring CHAP on ISDN

Introduction To ISDN, Part IV: Configuring PPP CHAP Authentication

In part III of this ISDN tutorial, we learned that PPP has two main methods of authentication that Cisco certification candidates need to know how to configure: PAP and CHAP.

PAP has very few advantages over CHAP. PAP passwords are carried over the line in clear text, which in today