ly flip to the page you need. Try it today for free. Network Warrior Gary A. Donahue O'REILLY Beijing Cambridge Farnham . Köln Paris . Sebastopol Taipei . Tokyo Network Warrior by Gary A. Donahue Copyright © 2007 O'Reilly Media, Inc. All rights reserved. Printed in the United States of America. Published by O'Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O'Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (safari.oreilly.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or corporate@oreilly.com. Editor: Mike Loukides Indexer: Ellen Troutman Production Editor: Sumita Mukherji Cover Designer: Karen Montgomery Copyeditor: Rachel Head Interior Designer: David Futato Proofreader: Sumita Mukherji Illustrators: Robert Romano and Jessamyn Read Printing History: June 2007: First Edition. Nutshell Handbook, the Nutshell Handbook logo, and the O'Reilly logo are registered trademarks of O'Reilly Media, Inc. The Cookbook series designations, Network Warrior, the image of a German boarhound, and related trade dress are trademarks of O'Reilly Media, Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O'Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. RepKover™ This book uses RepKover™, a durable and flexible lay-flat binding. ISBN-10: 0-596-10151-1 ISBN-13: 978-0-596-10151-0 For my girls: Lauren, Meghan, and Colleen, and Cozy and Daisy. -Gary A. Donahue Table of Contents Preface Part I. Hubs, Switches, and Switching 1. What Is a Network? 2. Hubs and Switches Switches 3. Auto-Ne