CCNA 4 v3.0 Module 3 PPP

1© 2003, Cisco Systems, Inc. All rights reserved.

CCNA 4 v3.0 Module 3 PPP

222© 2003, Cisco Systems, Inc. All rights reserved.

Purpose of This PowerPoint

• This PowerPoint primarily consists of the Target Indicators (TIs) of this module in CCNA version 3.0.

• It was created to give instructors a PowerPoint to take and modify as their own.

• This PowerPoint is:NOT a study guide for the module final assessment.NOT a study guide for the CCNA certification exam.

• Please report any mistakes you find in this PowerPoint by using the Academy Connection Help link.

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To Locate Instructional Resource Materials on Academy Connection:

• Go to the Community FTP Center to locate materials created by the instructor community

• Go to the Tools section• Go to the Alpha Preview section• Go to the Community link under Resources• See the resources available on the Class home page for

classes you are offering• Search http://www.cisco.com • Contact your parent academy!

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Objectives

• Serial point-to-point links• PPP authentication• Configuring PPP

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Introduction to Serial Communication

Some of the many serial communications standards include the following:

RS-232-E V.35 High-Speed Serial Interface (HSSI)

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Time-Division Multiplexing

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Demarcation Point

The point in the network where the responsibility of the service provider or "telco" ends.

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DTE-DCE

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Serial Connection Options

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HDLC Encapsulation

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Configuring HDLC Encapsulation

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Troubleshooting a Serial Interface

• Five possible problem states can be identified in the interface status line of the show interface serial display: Serial x is down, line protocol is down. Serial x is up, line protocol is down. Serial x is up, line protocol is up (looped). Serial x is up, line protocol is down

(disabled). Serial x is administratively down, line

protocol is down.

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PPP Layered Architecture

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PPP and the Data Link Layer

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PPP and the Network Layer

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Establishing a PPP Session

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PPP Operation

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LCP Options

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PPP Configuration Options

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NCP

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PPP Authentication Protocols

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PPP Authentication

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Password Authentication Protocol (PAP)

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Challenge Handshake Authentication Protocol (CHAP)

CHAP provides protection against playback attack through the use of a variable challenge value that is unique and unpredictable.

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PPP Encapsulation and Authentication Process

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CHAP Authentication Process

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Configuring PPP

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Configuring PPP Authentication

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PAP Configuration

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CHAP Configuration

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Verifying PPP

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PPP Configuration Commands

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Debug PPP Authentication