Cisco Certification Introduction To ISDN Part III
Configuring PPP PAP Authentication
Now we know how the ISDN link comes up (interesting traffic), and some scenarios that might cause the link to stay up, we need to look at ISDN authentication schemes. The two methods Cisco certification candidates must be familiar with are PAP and CHAP.
Password Authentication Protocol (PAP) sends the username and password over the ISDN link in clear-text. Sending any passwords over any WAN link in clear-text is generally a bad idea, but it's important to know you have this option.
Regarding both PAP and CHAP, it's a common misunderstanding that each side must authenticate the other. PAP and CHAP both support bidirectional and unidirectional auth...
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