Packet™ magazine is published quarterly and distributed free of charge to users of Cisco Systems products. Direct address corrections and other correspondence to packet@cisco.com, or to Packet, in care of: Cisco Systems, Inc. 170 West Tasman Drive San Jose, California, 95134-1706 USA Phone: 408 526-4000 Editor-in-Chief: Joanna Holmes Staff Editor: Susan Borton Art Direction: Donna Helliwell Design: Jeff Brand Production: Nanci Mason, Laurie Stapleton, Randy Jennings Circulation: Jennifer Biondi Online Production: Sarah Beaver, Nanci Mason Advertising Contact: Jennifer Biondi, 408 527-6399 (California), jbiondi@cisco.com Cover image by Jeff Brand Published by the Cisco Systems News Publications Group Special thanks to the following contributors: Debi Amdahl, David Baum, Barbara Dallenbach, Mark Davis, Donna Deuell, Kenis Dunne, Michael Hakkert, Mary Hecht-Kissell, Liz Horwitt, Janice King, Gene Knauer, Patrice Steiner, Sarah Stokes, Martha Strizich, Everett Tackett, Eric Ward, Joanie Wexler, and the Cisco Graphics Group. Fast Step, IOS, JumpStart, NetRanger, Packet, and PIX are trademarks; Empowering the Internet Generation is a service mark; and BPX, Catalyst, Cisco, Cisco IOS, Cisco Systems, the Cisco Systems Logo, EtherChannel, LightStream, and MICA are registered trademarks of Cisco Systems, Inc. in the USA and certain other countries. All other trademarks mentioned in this document are the property of their respective owners. Packet, copyright (c) 1998 by Cisco Systems, Inc. All rights reserved. Printed in the USA. No part of this publication may be reproduced in any form, or by any means, without prior written permission from Cisco Systems, Inc. This publication is distributed on an "as-is" basis, without warranty of any kind either express or implied, including but not limited to the implied warranties of merchantability, fitness for a particular purpose, or noninfringement. This publication could contain technical inaccuracies or typographical errors. Later issues may modify or update information provided in this issue. Neither the publisher nor any contributor shall have any liability to any person for any loss or damage caused directly or indirectly by the information contained herein. Table of Contents Posted: Tue Dec 29 12:56:26 PST 1998 Copyright © 1998 Cisco Systems, Inc.