Seguridad En Redes

THIRD EDITION

COMPUTER NETWORKS
A Systems Approach

The Morgan Kaufmann Series in Networking

Series Editor, David Clark, M.I.T.
Computer Networks: A Systems Approach, 3e Larry L. Peterson and Bruce S. Davie Network Architecture, Analysis, and Design, 2e James D. McCabe MPLS Network Management: MIBs, Tools, and Techniques Thomas D. Nadeau Developing IP-Based Services: Solutions forService Providers and Vendors Monique Morrow and Kateel Vijayananda Telecommunications Law in the Internet Age Sharon K. Black Optical Networks: A Practical Perspective, 2e Rajiv Ramaswami and Kumar N. Sivarajan Internet QoS: Architectures and Mechanisms Zheng Wang TCP/IP Sockets in Java: Practical Guide for Programmers Michael J. Donahoo and Kenneth L. Calvert TCP/IP Sockets in C: Practical Guidefor Programmers Kenneth L. Calvert and Michael J. Donahoo Multicast Communication: Protocols, Programming, and Applications Ralph Wittmann and Martina Zitterbart MPLS: Technology and Applications Bruce Davie and Yakov Rekhter High-Performance Communication Networks, 2e Jean Walrand and Pravin Varaiya Internetworking Multimedia Jon Crowcroft, Mark Handley, and Ian Wakeman Understanding NetworkedApplications: A First Course David G. Messerschmitt Integrated Management of Networked Systems: Concepts, Architectures, and their Operational Application Heinz-Gerd Hegering, Sebastian Abeck, and Bernhard Neumair Virtual Private Networks: Making the Right Connection Dennis Fowler Networked Applications: A Guide to the New Computing Infrastructure David G. Messerschmitt Modern Cable TelevisionTechnology: Video, Voice, and Data Communications Walter Ciciora, James Farmer, and David Large Switching in IP Networks: IP Switching, Tag Switching, and Related Technologies Bruce S. Davie, Paul Doolan, and Yakov Rekhter Wide Area Network Design: Concepts and Tools for Optimization Robert S. Cahn Frame Relay Applications: Business and Technology Case Studies James P. Cavanagh

For further informationon these books and for a list of forthcoming titles, please visit our website at http://www.mkp.com

THIRD EDITION

Larry L. Peterson & Bruce S. Davie

COMPUTER NETWORKS
A Systems Approach

Senior Editor Rick Adams Publishing Services Manager Simon Crump Developmental Editor Karyn Johnson Cover Design Ross Carron Design Cover Image Vasco de Gama Bridge, Lisbon, PortugalComposition/Illustration International Typesetting and Composition Copyeditor Ken DellaPenta Proofreader Jennifer McClain Indexer Steve Rath Printer Courier Corporation Designations used by companies to distinguish their products are often claimed as trademarks or registered trademarks. In all instances in which Morgan Kaufmann Publishers is aware of a claim, the product names appear in initial capital or allcapital letters. Readers, however, should contact the appropriate companies for more complete information regarding trademarks and registration. Morgan Kaufmann Publishers An Imprint of Elsevier Science 340 Pine Street, Sixth Floor San Francisco, CA 94104-3205 www.mkp.com
© 2003 by Elsevier Science (USA) All rights reserved Printed in the United States of America

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5 4 3 2 1No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means—electronic, mechanical, photocopying, or otherwise—without the prior written permission of the publisher. Library of Congress Control Number: xxxxxxxxxx ISBN: 1-55860-832-X (Casebound) ISBN: 1-55860-833-8 (Paperback)

This book is printed on acid-free paper.

To Lee Petersonand Robert Davie

This Page Intentionally Left Blank

F O R E W O R D

David Clark
Massachusetts Institute of Technology

T

his third edition represents another major upgrade to this classic networking book. The field continues to change fast, and new concepts emerge with amazing speed. This version expands its discussion of a lot of important new topics, including peer-to-peer...