Know what PPP is and what its features are

PPP is the most commonly used authentication protocol for dial-up Internet access. Its features include address notification, authentication using PAP or CHAP, support of many protocols, and link monitoring.
Key Terms and Concepts

Challenge Authentication Protocol (CHAP)

Supported on lines using PPP. This security feature uses encrypted passwords that identify the remote end of a connection, helping to keep out unauthor- ized users.
Link Control Protocol (LCP)

Used to provide session setup, authentication, dynamic addressing, compression, and multilink.
Network Control Protocol (NCP)

Used to provide multiple Network- layer protocols to run over the same PPP link.
Password Authentication Protocol (PAP)

Unlike CHAP, PAP uses unencrypted passwords in PPP to identify a user for authentication. PAP is much less secure than CHAP.
Point-to-Point Protocol (PPP)

A data encapsulation method that uses the Physical-, Data Link¨C, and Network-layer specifications of the OSI model. PPP provides synchronous and asynchronous circuits.

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