Page 921 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

designed to support the transmission of IP traffic over dial-up or

point-to-point links. PPP allows for multivendor interoperability of
WAN devices supporting serial links. All dial-up and most point-to-
point connections are serial in nature (as opposed to parallel). PPP
includes a wide range of communication services, including the
assignment and management of IP addresses, management of
synchronous communications, standardized encapsulation,
multiplexing, link configuration, link quality testing, error detection,

and feature or option negotiation (such as compression).

PPP was originally designed to support CHAP and PAP for
authentication. However, recent versions of PPP also support MS-
CHAP, EAP, and SPAP. PPP can also be used to support Internetwork
Packet Exchange (IPX) and DECnet protocols. PPP is an internet
standard documented in RFC 1661. It replaced the Serial Line Internet
Protocol (SLIP). SLIP offered no authentication, supported only half-
duplex communications, had no error-detection capabilities, and

required manual link establishment and teardown.