Welcome to CCNA! Recently Cisco Press came to me and told me, albeit very quietly, that there was going to be some changes made to the CCNA certification exam, and asked whether I would be interested in updating my CCNA Portable Command Guide for release around the time of the announcement of the new exam. I was already working on the various command guides for the new CCNP certification exams, but I felt that a revision wouldn’t take a lot of time, as hopefully there would still be a lot of concepts that hadn’t changed | 111111B CISCO. CCNA Portable Command Guide Second Edition All the CCNA 640-802 commands in one compact portable resource Scott Empson CCNA Portable Command Guide Second Edition Scott Empson Cisco Press 800 East 96th Street Indianapolis Indiana 46240 USA ii CCNA Portable Command Guide Second Edition Scott Empson Copyright 2008 Cisco Systems Inc. Published by Cisco Press 800 East 96th Street Indianapolis IN 46240 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 First Printing July 2007 Library of Congress Cataloging-in-Publication Data Empson Scott. Portable command reference Scott Empson. -- 2nd ed. p. cm. ISBN 978-1-58720-193-6 pbk. 1. Computer networks--Examinations--Study guides. 2. Internetworking Telecommunication --Examinations--Study guides. 3. Electronic data processing personnel--Certification. I. Title. 2007 2007023863 ISBN-13 978-1-5872-0193-6 ISBN-10 1-58720-193-3 Warning and Disclaimer This book is designed to provide information about the Certified Cisco Networking Associate CCNA exam and the commands needed at this level of network administration. 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 author Cisco Press and Cisco Systems Inc. shall have neither liability nor responsibility 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 author and are not necessarily those of Cisco Systems Inc. Trademark .