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CCDA Official Exam Certification Guide
Third Edition

Anthony Bruno, CCIE No. 2738 Steve Jordan, CCIE No. 11293

Cisco Press
800 East 96th Street Indianapolis, IN 46240 USA

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CCDA Official Exam Certification Guide, Third Edition
Anthony Bruno, CCIE No. 2738 Steve Jordan, CCIE No. 11293 Copyright © 2007 Cisco Systems, Inc. Published by: Cisco Press 800 East 96th Street Indianapolis, IN46240 USA All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without written permission from the publisher, except for the inclusion of brief quotations in a review. Printed in the United States of America 1 2 3 4 5 6 7 8 9 0 FirstPrinting June 2007 Library of Congress Cataloging-in-Publication Data Bruno, A. Anthony. CCDA official exam certification guide / Anthony Bruno, Steve Jordan. —3rd ed. p. cm. ISBN-13: 978-1-58720-177-6 (hardcover w/dvd) 1. Electronic data processing personnel—Certification. 2. Computer networks— Examinations—Study guides. I. Jordan, Steve. II. Title. QA76.3.B7847 2007 004.6076--dc22 2007015940 ISBN-10:1-58720-177-1 ISBN-13: 978-1-58720-177-6

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This book is designed to provide information about the CCDA exam. Every effort has been made to make this book as complete and accurate as possible, but no warranty or fitness is implied. The information is provided on an “as is” basis. The authors, Cisco Press, and Cisco Systems, Inc. shall have neither liability norresponsibility to any person or entity with respect to any loss or damages arising from the information contained in this book or from the use of the discs or programs that may accompany it. The opinions expressed in this book belong to the authors and are not necessarily those of Cisco Systems, Inc.

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Trademark Acknowledgments
All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Cisco Press or Cisco Systems, Inc. cannot attest to the accuracy of this information. Use of a term in this book should not beregarded as affecting the validity of any trademark or service mark. Publisher: Paul Boger Executive Editor: Brett Bartow Managing Editor: Patrick Kanouse Development Editor: Andrew Cupp Senior Project Editor: Tonya Simpson Copy Editor: Gayle Johnson Publishing Coordinator: Vanessa Evans Designer: Louisa Adair Composition: Mark Shirar Indexer: Tim Wright Associate Publisher: David Dusthimer CiscoRepresentative: Anthony Wolfenden Cisco Press Program Manager: Jeff Brady Technical Editors: Mark Gallo, Steve Jordan, and Anthony Sequeira

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About the Authors
Anthony Bruno, CCIE No. 2738, is a senior principal consultant with British Telecom with more than 17 years of experience in the internetworking field. Previously, he worked for International Network Services. His other network...