Cisco TCP-IP Routing Professional Reference.pdf

Cisco TCP/IP Routing Professional Reference

by Chris Lewis

ISBN: 0070411301

Acknowledgments

First, I have to thank my wife Claudia, whose love and support were my greatest resources when

writing this book. Next I have to thank Thomas Astuto and Deborah Curtis for doing a fine job of

creating all the figures and for making all the changes I regularly requested. I also thank Mike

Barnow and the rest of the Westchester Track Club for giving me something to do that was

completely unrelated to TCP/IP during the last six months. I must also acknowledge four of the

best network engineers in the business for their insight and timely criticisms, namely Derek

Hannan, Dan DiNatale, Joe Rinato, and Ken Stemmler.

Throughout the text, I have referred to the Cisco published documentation to check the syntax of

commands used. References to the Cisco documentation are used with the permission of Cisco

permission to use the materials "as is," with no expressed or implied warranties from Cisco, who

disclaims all liability arising out of the authorized use of such material.

Introduction

Overview

This book differs from most other books on TCP/IP because it focuses on how to implement the

TCP/IP protocols using the most prevalent TCP/IP routing device in use today, the Cisco router.

The book provides detailed descriptions, examples, and configurations that can be used for

building real-world internetworks. The text begins at a level appropriate for the TCP/IP and router

novice, but advances to cover topics such as routing protocol optimization, security, implementing

multiprotocol networks, and troubleshooting techniques that experienced router engineers will find

useful.

The TCP/IP set of networking protocols rapidly is becoming the de facto standard for local and

wide area networking. Its prominence is due in part to its openness. It is considered an open

standard because no one commercial organization controls the standard. This allows all vendors

an equal footing when developing TCP/IP products and gives devices from different vendors a

better-than-even chance of working together properly.

In addition to being an open standard, the TCP/IP protocols have proved themselves durable in

Fueling the current growth of the Internet are World Wide Web services, which make it easy for

anyone who can operate a computer mouse to retrieve information from anywhere in the world.

This technology is so attractive to organizations that most forward-thinking companies are building

much of their information storage and retrieval systems around it on their own internal intranets.

Intranets use the same TCP/IP network protocols as the public Internet but are implemented on

the company's own private network.

To support this new computing paradigm, a TCP/IP network is required. To implement a TCP/IP

network, you need routers. If you are involved in any way with network administration, design, or

management, router technology either is or will become important to you.

This book is clearly not a novel, and I don't expect it to be read as one. Of course, you can start at

Chapter 1 and read all chapters in sequence, but this is not how I use my technical books. I suspect

that most people will read the chapters that are of particular interest to them at different times. To

support this type of use, there is some duplication of information across chapters when necessary.

the largest network in the world, the Internet.

Terminology

Throughout the book, I have used some terms that should be defined. First, let's discuss how we

identify, in networking terms, computers that are grouped together. An internetwork is a collection

of networks connected together. A network refers to all devices that belong to one network

number. A subnetwork, or subnet, is a section of a network configured to act as if it were a

separate network as far as other computers configured on the same network number are

concerned.

Another potentially confusing term is that of gateway. In general networking terms, a gateway is an

Application layer device, something that converts from one type of communications protocol to

another. In TCP/IP language, a gateway is synonymous with a router.

Conventions

Outputs from Cisco router screen displays are presented in many figures and parts of the text. Any

text or commands that are to be entered into the terminal attached to the router are in boldface

type; the nonbold text represents what is displayed by the router. In these screen displays, I have

had to indicate that at times, a shifting key and letter key must be depressed simultaneously to get

the desired response. An example is <Ctrl-Z>, which means that you hold down the key labeled

"Ctrl" while pressing the "Z" key.

Chapter 1: Router Basics

Objectives

The objectives of this chapter are as follows:

•Explain the role of a router in an internetwork.

•Discuss how a router is both similar to and different from other network computing devices.

•Introduce the Cisco router user interface.

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