PPP overview

Point-to-Point Protocol (PPP) is a point-to-point link layer protocol. It provides user authentication, supports synchronous/asynchronous communication, and allows for easy extension.

PPP includes the following protocols:

• Link control protocol (LCP)—Establishes, tears down, and monitors data links.

• Network control protocol (NCP)—Negotiates the packet format and type for data links.

• Authentication protocols—Authenticate users. Protocols include the following:

  • Password Authentication Protocol (PAP).

  • Challenge Handshake Authentication Protocol (CHAP).

  • Microsoft CHAP (MS-CHAP).

  • Microsoft CHAP Version 2 (MS-CHAP-V2).