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.

333© 2003, Cisco Systems, Inc. All rights reserved.

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!

444© 2003, Cisco Systems, Inc. All rights reserved.

Objectives

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

555© 2003, Cisco Systems, Inc. All rights reserved.

Introduction to Serial Communication

Some of the many serial communications standards include the following:

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

666© 2003, Cisco Systems, Inc. All rights reserved.

Time-Division Multiplexing

777© 2003, Cisco Systems, Inc. All rights reserved.

Demarcation Point

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

888© 2003, Cisco Systems, Inc. All rights reserved.

DTE-DCE

999© 2003, Cisco Systems, Inc. All rights reserved.

Serial Connection Options

101010© 2003, Cisco Systems, Inc. All rights reserved.

HDLC Encapsulation

111111© 2003, Cisco Systems, Inc. All rights reserved.

Configuring HDLC Encapsulation

121212© 2003, Cisco Systems, Inc. All rights reserved.

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.

131313© 2003, Cisco Systems, Inc. All rights reserved.

PPP Layered Architecture

141414© 2003, Cisco Systems, Inc. All rights reserved.

PPP and the Data Link Layer

151515© 2003, Cisco Systems, Inc. All rights reserved.

PPP and the Network Layer

161616© 2003, Cisco Systems, Inc. All rights reserved.

Establishing a PPP Session

171717© 2003, Cisco Systems, Inc. All rights reserved.

PPP Operation

181818© 2003, Cisco Systems, Inc. All rights reserved.

LCP Options

191919© 2003, Cisco Systems, Inc. All rights reserved.

PPP Configuration Options

202020© 2003, Cisco Systems, Inc. All rights reserved.

NCP

212121© 2003, Cisco Systems, Inc. All rights reserved.

PPP Authentication Protocols

222222© 2003, Cisco Systems, Inc. All rights reserved.

PPP Authentication

232323© 2003, Cisco Systems, Inc. All rights reserved.

Password Authentication Protocol (PAP)

242424© 2003, Cisco Systems, Inc. All rights reserved.

Challenge Handshake Authentication Protocol (CHAP)

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

252525© 2003, Cisco Systems, Inc. All rights reserved.

PPP Encapsulation and Authentication Process

262626© 2003, Cisco Systems, Inc. All rights reserved.

CHAP Authentication Process

272727© 2003, Cisco Systems, Inc. All rights reserved.

Configuring PPP

282828© 2003, Cisco Systems, Inc. All rights reserved.

Configuring PPP Authentication

292929© 2003, Cisco Systems, Inc. All rights reserved.

PAP Configuration

303030© 2003, Cisco Systems, Inc. All rights reserved.

CHAP Configuration

313131© 2003, Cisco Systems, Inc. All rights reserved.

Verifying PPP

323232© 2003, Cisco Systems, Inc. All rights reserved.

PPP Configuration Commands

333333© 2003, Cisco Systems, Inc. All rights reserved.

Debug PPP Authentication