DATA COMMUNICATIONS AND NETWORKING

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DATA COMMUNICATIONS AND

NETWORKING

Second Edition

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DATA COMMUNICATIONS AND

NETWORKING

Second Edition

Behrouz A. Forouzan

DeAnza College

with

Catherine Coombs and Sophia Chung Fegan

Boston Burr Ridge, IL Dubuque, IA Madisoornk, WISan NFerwanYcisco St Bangkok Bogot? Caracas Lisbon London Madrid

Mexico City Milan New Delhi Seoeul SySdinnegyaapioprTei oroTnto

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DATA COMMUNICATIONS AND NETWORKING Published by McGraw-Hill, an imprint of the McGraw-Hill Companies, Inc. 1221 Avenue of the Americas, New York, NY, 10020. Copyright ? 2001, 1998 by The McGraw-Hill Companies, Inc. All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written consent of The McGraw-Hill Companies, Inc., including, but not limited to, in any network or other electronic storage or transmission, or broadcast for distance learning. This book is printed on acid-free paper.

1 2 3 4 5 6 7 8 9 0 DOC/DOC 0 9 8 7 6 5 4 3 2 1 0 ISBN 0-07-232204-7 Publisher: Thomas Casson Executive editor: Elizabeth A. Jones Developmental editor: Emily J. Gray Senior marketing manager: John T. Wannemacher Senior project manager: Amy Hill Senior production supervisor: Heather D. Burbridge Freelance design coordinator: Gino Cieslik Supplement coordinator: Susan Lombardi New media: Christopher Styles Cover design: Joanne Schopler Cover illustration: Tony Stone Compositor: Interactive Composition Corporation Typeface: 10/12 Times Roman Printer: R. R. Donnelley & Sons Company

[CIP to come]



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To Faezeh with love.

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