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iiIT Essentials: PC Hardware and Software Companion GuideIT Essentials: PC Hardware and SoftwareCompanion GuideThird EditionDavid Anfinson • Ken QuammeCopyright© 2008 Cisco Systems, Inc.Cisco Press logo is a trademark of Cisco Systems, Inc.Published by:Cisco Press800 East 96th StreetIndianapolis, IN 46240 USAAll rights reserved. No part of this book may be reproduced or transmitted in anyform or by any means, electronic or mechanical, including photocopying, recording,or by any information storage and retrieval system, without written permission fromthe publisher, except for the inclusion of brief quotations in a review.Printed in the United States of AmericaFirst Printing January 2008Library of Congress Cataloging-in-Publication Data:ISBN-13: 978-1-58713-199-8ISBN-10: 1-58713-199-4Warning and DisclaimerThis book is designed to provide information about PC hardware and software fromthe Cisco Networking Academy IT Essentials: PC Hardware and Software course.Every effort has been made to make this book as complete and as accurate as possible,but no warranty or fitness is implied.The information is provided on an “as is” basis. The authors, Cisco Press, and CiscoSystems, Inc., shall have neither liability nor responsibility to any person or entitywith respect to any loss or damages arising from the information contained in thisbook 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 necessarilythose of Cisco Systems, Inc.PublisherPaul BogerAssociate PublisherDave DusthimerCisco RepresentativeAnthony WolfendenCisco Press ProgramManagerJeff BradyExecutive EditorMary Beth RayManaging EditorPatrick KanouseDevelopment EditorAndrew CuppCopy EditorGayle JohnsonWritten Elegance, Inc.Technical EditorsDavid E. JohnsonScott StephensonEditorial AssistantVanessa EvansDesignerLouisa AdairIndexerTim WrightProofreader[PE to insert]