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Point-to-Point Protocol (PPP)

Accessing the WAN – Chapter 2

Objectives Describe the fundamental concepts of point-to-point serial

communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting.

Describe PPP concepts including PPP layered architecture, PPP frame structure, PPP session establishment, multiprotocol encapsulation support, link control protocol (LCP), network control protocol (NCP), and Internet Protocol Control Protocol (IPCP).

Configure PPP on a serial interface including enabling PPP encapsulation, verifying the PPP connection and troubleshooting encapsulation problems.

Configure PPP authentication including explaining PAP and CHAP authentication protocols, configuring PPP authentication using PAP and CHAP, and troubleshooting PPP authentication problems.

Describe the Fundamental Concepts of Point-to-Point Serial Communication

Describe the concept of serial communication as the basis of WAN technologies

Explain how two or more data streams are transported across a single physical connection using TDM

Define the location of the demarcation point relative to customer and service provider networks

Explain the terms DTE and DCE with relative to the location of devices in a network

Describe how high-level data link control (HDLC) uses one of three frame types to encapsulate data

Explain when and how to configure HDLC encapsulation on a router

Describe the procedure to follow when troubleshooting a serial connection

Describe Point-to-Point Concepts

Describe PPP in terms of its use in WAN links

Describe the general function of each layer of PPP architecture

Describe the purpose and format of each of the fields in a PPP frame

Define the three phases of PPP session establishment

Explain the role of the LCP in PPP

Describe the characteristics of NCP

Configure PPP on a Serial Interface

Describe how configuration options are communicated in the LCP frame

Explain the purpose of the commands used to configure and verify PPP connections

Explain the output of the show interfaces serial command

Explain the output of the debug ppp command

Configuring PPP with Authentication

Differentiate between PAP and CHAP

Describe how to use PAP to authenticate a PPP connection

Describe how to use CHAP to authenticate a PPP connection

Outline the PPP encapsulation and authentication process on a flow chart

Explain how to configure a PPP connection with authentication

Explain the output of the debug ppp authentication command

Summary

PPP is a widely used WAN protocol

PPP provides multi-protocol LAN to WAN connections

PPP session establishment – 4 phases

Link establishment

Link quality determination

Network layer protocol configuration negotiation

Link termination

WAN Encapsulation

–HDLC default encapsulation

–PPP

Summary

PPP authentication

–PAP

•2 way handshake

–CHAP

•3 way handshake

–Use debug ppp authentication to confirm authentication configuration

PPP configuration

–Done on a serial interface

After PPP configuration, use show interfaces command to display:

–LCP state

–NCP state

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