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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 3: PPP (Point-to-Point Protocol)

Exam Objectives

Understanding PPP

Seeing the operational flow of PPP

Examining the Link Control Protocol and Network Control Protocol

Revealing PAP and CHAP authentication methods

Understanding PPP configuration using the CLI

Examining the Cisco SDM GUI configuration with PPP

Setting up PAP and CHAP authentication

Monitoring and troubleshooting PPP

What Is PPP?

The Point-to-Point Protocol (PPP) is a standard WAN encapsulation method that transports multiprotocol frames between peer connections across full-duplex, bidirectional links. PPP may be used over dedicated serial point-to-point links, Integrated Services Digital Network (ISDN), or asynchronous dialup connections and has superseded the Serial Line Internet Protocol (SLIP) for synchronous and asynchronous communications

As shown in Figure 3-1, PPP operates at the physical and data link layers of the OSI model to provide data connectivity between endpoints using encapsulation, multiplexing, load balancing, error detection, data compression, and authentication features. Based on the original HDLC specification, PPP adds features such as the Link Control Protocol (LCP) and the Network Control Protocol (NCP). NCP and LCP are key components of PPP and are responsible for proper setup and operation of the Point-to-Point Protocol link between DCE and DTE devices.

Figure 3-1: The OSI model and PPP stack.

Key features of PPP are as follows:

May be used on all DCE and DTE interfaces. ...

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