Computer Networking A Top-Down Approach 6th Edition
James F. Kurose
University of Massachusetts, Amherst
Keith W. Ross
Polytechnic Institute of NYU
COMPUTER
NETWORKING
A Top-Down Approach
SIXTH EDITION
BostonColumbusIndianapolisNew YorkSan FranciscoUpper Saddle River
Amsterdam Cape TownDubaiLondonMadridMilanMunichParisMontréalToronto
DelhiMexico CitySão PauloSydneyHong KongSeoulSingaporeTaipeiTokyo
Vice President and Editorial Director, ECS:
Marcia Horton
Editor in Chief: Michael Hirsch
Editorial Assistant: Emma Snider
Vice President Marketing: Patrice Jones
Marketing Manager: Yez Alayan
Marketing Coordinator: Kathryn Ferranti
Vice President and Director of Production:
Vince O’Brien
Managing Editor: Jeff Holcomb
Senior Production Project Manager:
Marilyn Lloyd
Manufacturing Manager: Nick Sklitsis
Operations Specialist: Lisa McDowell
Art Director, Cover: Anthony Gemmellaro
Art Coordinator: Janet Theurer/
Theurer Briggs Design
Art Studio: Patrice Rossi Calkin/
Rossi Illustration and Design
Cover Designer: Liz Harasymcuk
Text Designer: Joyce Cosentino Wells
Cover Image: ©Fancy/Alamy
Media Editor: Dan Sandin
Full-Service Vendor: PreMediaGlobal
Senior Project Manager: Andrea Stefanowicz
Printer/Binder: Edwards Brothers
Cover Printer: Lehigh-Phoenix Color
Copyright © 2013, 2010, 2008, 2005, 2003 by Pearson Education, Inc., publishing as
Addison-Wesley. All rights reserved. Manufactured in the United States of America. This
publication is protected by Copyright, and permission should be obtained from the pub-
lisher prior to any prohibited reproduction, storage in a retrieval system, or transmission
in any form or by any means, electronic, mechanical, photocopying, recording, or like-
wise. To obtain permission(s) to use material from this work, please submit a written
request to Pearson Education, Inc., Permissions Department, One Lake Street, Upper
Saddle River, New Jersey 07458, or you may fax your request to 201-236-3290.
Many of the designations by manufacturers and sellers to distinguish their products are
claimed as trademarks. Where those designations appear in this book, and the publisher was
aware of a trademark claim, the designations have been printed in initial caps or all caps.
Library of Congress Cataloging-in-Publication Data
Kurose, James F.
Computer networking : a top-down approach / James F. Kurose, Keith W. Ross.—6th ed.
p. cm.
Includes bibliographical references and index.
ISBN-13: 978-0-13-285620-1
ISBN-10: 0-13-285620-4
1. Internet. 2. Computer networks. I. Ross, Keith W., 1956- II. Title.
TK5105.875.I57K88 2012
004.6—dc23
2011048215
10987654321
ISBN-13: 978-0-13-285620-1
ISBN-10: 0-13-285620-4
This book was composed in Quark. Basal font is Times. Display font is Berkeley.
iii
About the Authors
Jim Kurose
Jim Kurose is a Distinguished University Professor of Computer Science at the
University of Massachusetts, Amherst.
Dr. Kurose has received a number of recognitions for his educational
activities including Outstanding Teacher Awards from the National
Technological University (eight times), the University of Massachusetts, and
the Northeast Association of Graduate Schools. He received the IEEE Taylor
Booth Education Medal and was recognized for his leadership of
Massachusetts’ Commonwealth Information Technology Initiative. He has
been the recipient of a GE Fellowship, an IBM Faculty Development Award,
and a Lilly Teaching Fellowship.
Dr. Kurose is a former Editor-in-Chief of IEEE Transactions on
Communications and of IEEE/ACM Transactions on Networking. He has
been active in the program committees for IEEE Infocom, ACM SIGCOMM,
ACM Internet Measurement Conference, and ACM SIGMETRICS for a
number of years and has served as Technical Program Co-Chair for those
conferences. He is a Fellow of the IEEE and the ACM. His research interests
include network protocols and architecture, network measurement, sensor
networks, multimedia communication, and modeling and performance
evaluation. He holds a PhD in Computer Science from Columbia University.
Keith Ross
Keith Ross is the Leonard J. Shustek Chair Professor and Head of the Computer
Science Department at Polytechnic Institute of NYU. Before joining NYU-Poly in
2003, he was a professor at the University of Pennsylvania (13 years) and a
professor at Eurecom Institute (5 years). He received a B.S.E.E from Tufts
University, a M.S.E.E. from Columbia University, and a Ph.D. in Computer and
Control Engineering from The University of Michigan. Keith Ross is also the
founder and original CEO of Wimba, which develops online multimedia
applications for e-learning and was acquired by Blackboard in 2010.
Professor Ross’s research interests are in security and privacy, social networks,
peer-to-peer networking, Internet measurement, video streaming, content distribution
networks, and stochastic modeling. He is an IEEE Fellow, recipient of the Infocom
2009 Best Paper Award, and recipient of 2011 and 2008 Best Paper Awards
for Multimedia Communications (awarded by IEEE Communications Society). He
has served on numerous journal editorial boards and conference program commit-
tees, including IEEE/ACM Transactions on Networking, ACM SIGCOMM, ACM
CoNext, and ACM Internet Measurement Conference. He also has served as an
advisor to the Federal Trade Commission on P2P file sharing.
This page intentionally left blank
To Julie and our three precious
ones—Chris, Charlie, and Nina
JFK
A big THANKS to my professors, colleagues,
and students all over the world.
KWR
This page intentionally left blank
Preface
Welcome to the sixth edition of Computer Networking: A Top-Down Approach. Since
the publication of the first edition 12 years ago, our book has been adopted for use at
many hundreds of colleges and universities, translated into 14 languages, and used
by over one hundred thousand students and practitioners worldwide. We’ve heard
from many of these readers and have been overwhelmed by the positive response.
What’s New in the Sixth Edition?
We think one important reason for this success has been that our book continues to offer
a fresh and timely approach to computer networking instruction. We’ve made changes
in this sixth edition, but we’ve also kept unchanged what we believe (and the instruc-
tors and students who have used our book have confirmed) to be the most important
aspects of this book: its top-down approach, its focus on the Internet and a modern
treatment of computer networking, its attention to both principles and practice, and its
accessible style and approach toward learning about computer networking. Neverthe-
less, the sixth edition has been revised and updated substantially:
• The Companion Web site has been significantly expanded and enriched to
include VideoNotes and interactive exercises, as discussed later in this Preface.
• In Chapter 1, the treatment of access networks has been modernized, and the
description of the Internet ISP ecosystem has been substantially revised, account-
ing for the recent emergence of content provider networks, such as Google’s. The
presentation of packet switching and circuit switching has also been reorganized,
providing a more topical rather than historical orientation.
• In Chapter 2, Python has replaced Java for the presentation of socket program-
ming. While still explicitly exposing the key ideas behind the socket API, Python
code is easier to understand for the novice programmer. Moreover, unlike Java,
Python provides access to raw sockets, enabling students to build a larger variety
of network applications. Java-based socket programming labs have been
replaced with corresponding Python labs, and a new Python-based ICMP Ping
lab has been added. As always, when material is retired from the book, such as
Java-based socket programming material, it remains available on the book’s
Companion Web site (see following text).
• In Chapter 3, the presentation of one of the reliable data transfer protocols has
been simplified and a new sidebar on TCP splitting, commonly used to optimize
the performance of cloud services, has been added.
• In Chapter 4, the section on router architectures has been significantly updated,
reflecting recent developments and practices in the field. Several new integrative
sidebars involving DNS, BGP, and OSPF are included.
• Chapter 5 has been reorganized and streamlined, accounting for the ubiquity of
switched Ethernet in local area networks and the consequent increased use of
Ethernet in point-to-point scenarios. Also, a new section on data center network-
ing has been added.
• Chapter 6 has been updated to reflect recent advances in wireless networks, par-
ticularly cellular data networks and 4G services and architecture.
• Chapter 7, which focuses on multimedia networking, has gone through a major
revision. The chapter now includes an in-depth discussion of streaming video,
including adaptive streaming, and an entirely new and modernized discussion of
CDNs. A newly added section describes the Netflix, YouTube, and Kankan video
streaming systems. The material that has been removed to make way for these
new topics is still available on the Companion Web site.
• Chapter 8 now contains an expanded discussion on endpoint authentication.
• Significant new material involving end-of-chapter problems has been added. As
with all previous editions, homework problems have been revised, added, and
removed.
Audience
This textbook is for a first course on computer networking. It can be used in both
computer science and electrical engineering departments. In terms of programming
languages, the book assumes only that the student has experience with C, C++, Java,
or Python (and even then only in a few places). Although this book is more precise
and analytical than many other introductory computer networking texts, it rarely
uses any mathematical concepts that are not taught in high school. We have
Reviews
There are no reviews yet.