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Table of Contents Table of Contents Computer Networking A Top-Down Approach Featuring the Internet James F. Kurose and Keith W. Ross Preface Link to the Addison-Wesley WWW site for this book Link to overheads for this book Online Forum Discussion About This Book - with Voice! 1. Computer Networks and the Internet 1. What is the Internet? 2. What is a Protocol? 3. The Network Edge 4. The Network Core ■ Interactive Programs for Tracing Routes in the Internet ■ Java Applet: Message Switching and Packet Switching 5. Access Networks and Physical Media 6. Delay and Loss in Packet-Switched Networks 7. Protocol Layers and Their Service Models 8. Internet Backbones, NAPs and ISPs 9. A Brief History of Computer Networking and the Internet 10. ATM 11. Summary 12. Homework Problems and Discussion Questions 2. Application Layer 1. Principles of Application-Layer Protocols 2. The World Wide Web: HTTP 3. File Transfer: FTP 4. Electronic Mail in the Internet file:///D|/Downloads/Livros/computação/Computer%20Netw...20Approach%20Featuring%20the%20Internet/Contents-1.htm (1 of 4)20/11/2004 15:51:32 Table of Contents 5. The Internet's Directory Service: DNS ■ Interactive Programs for Exploring DNS 6. Socket Programming with TCP 7. Socket Programming with UDP 8. Building a Simple Web Server 9. Summary 10. Homework Problems and Discussion Questions 3. Transport Layer 1. Transport-Layer Services and Principles 2. Multiplexing and Demultiplexing Applications 3. Connectionless Transport: UDP 4. Principles of Reliable of Data Transfer ■ Java Applet: Flow Control in Action 5. Connection-Oriented Transport: TCP 6. Principles of Congestion Control 7. TCP Congestion Control 8. Summary 9. Homework Problems and Discussion Questions 4. Network Layer and Routing 1. Introduction and Network Service Model 2. Routing Principles 3. Hierarchical Routing 4. Internet Protocol ■ Java Applet: IP Fragmentation 5. Routing in the Internet 6. What is Inside a Router? 7. IPv6 8. Multicast Routing 9. Summary 10. Homework Problems and Discussion Questions 5. Link Layer and Local Area Networks 1. The Data Link Layer: Introduction, Services 2. Error Detection and Correction 3. Multiple Acces Protocols and LANs 4. LAN Addresses and ARP 5. Ethernet ■ CSMA/CD Applet 6. Hubs, Bridges and Switches 7. Wireless LANs: IEEE 802.11 8. The Point-to-Point Protocol 9. ATM 10. X.25 and Frame Relay 11. Summary 12. Homework Problems and Discussion Questions file:///D|/Downloads/Livros/computação/Computer%20Netw...20Approach%20Featuring%20the%20Internet/Contents-1.htm (2 of 4)20/11/2004 15:51:32 Table of Contents 6. Multimedia Networking 1. Multimedia Networking Applications 2. Streaming Stored Audio and Video 3. Making the Best of the Best-Effort Service: An Internet Phone Example 4. RTP 5. Beyond Best Effort 6. Scheduling and Policing Mechanisms for Providing QoS Guarantees 7. Integrated Services 8. RSVP 9. Differentiated Services 10. Summary 11. Homework Problems and Discussion Questions 7. Security in Computer Networks 1. What is Network Security? 2. Principles of Cryptography 3. Authentication: Who are You? 4. Integrity 5. Key Distribution and Certification 6. Secure E-Mail 7. Internet Commerce 8. Network-Layer Security: IPsec ■ 1999 Panel Discussion on Internet Security 9. Summary 10. Homework Problems and Discussion Questions 8. Network Management 1. What is Network Managmenet? 2. The Infrastructure for Network Management 3. The Internet Network Management Framework 4. ASN.1 5. Firewalls 6. Summary 7. Homework Problems and Discussion Questions Appendix ● Lab: Building a multi-threaded Web server in Java ● Lab: Building a mail user agent in Java ● Lab: Implementing a reliable transport protocol ● Lab: Implementing a distributed, asynchronous distance vector routing algorithm file:///D|/Downloads/Livros/computação/Computer%20Netw...20Approach%20Featuring%20the%20Internet/Contents-1.htm (3 of 4)20/11/2004 15:51:32 Table of Contents Some relevant online audio material: Unix Network Programming, Jim Kurose Introduction to Computer Networks, Jim Kurose Internet Protocols, Keith Ross Distribution of Stored Information in the Web, Keith Ross Asynchronous learning links: The Web of Asynchronous Learning Networks Copyright 1996-2000 James F. Kurose and Keith W. Ross file:///D|/Downloads/Livros/computação/Computer%20Netw...20Approach%20Featuring%20the%20Internet/Contents-1.htm (4 of 4)20/11/2004 15:51:32 preface Preface and Acknowledgments Welcome to our online textbook, Computer Networking: A Top-Down Approach. We ( Jim Kurose, Keith Ross, and Addison-Wesley-Longman) think you will find this textbook to be very different than the other computer networking books that are currently available. Perhaps the most unique and innovative feature of this textbook is that it is online and accessible through a Web browser. We believe that our online format has several things going for it. First, an online text can be accessed from any browser in the world, so a student (or any other reader) can gain access to the book at anytime from anyplace. Second, as all of us Internet enthusiasts know, much of the best material describing the intricacies of the Internet is in the Internet itself. Our hyperlinks, embedded in a coherent context, provide the reader direct access to some of the best sites relating to computer networks and Internet protocols. The links do not only point to RFCs but also to sites that are more pedagogic in nature, including home-brewed pages on particular aspects of Internet technology and articles appearing in online trade magazines. Being online also allows us to include many interactive features, including direct access to the Traceroute program, direct access to search engines for Internet Drafts, Java applets that animate difficult concepts, and (in the near future) direct access to streaming audio. Being online enables us to use more fonts and colors (both within the text and in diagrams), making the text both perky and cheerful. Finally, an online format will allow us to frequently release new editions (say, every year), which will enable the text to keep pace with this rapidly changing field. Another unusual feature of the text is its Internet focus. Most of the existing textbooks begin with a broader perspective and address the Internet as just as one of many computer network technologies. We instead put Internet protocols in the spotlight, and use the Internet protocols as motivation for studying some of the more fundamental computer networking concepts. But why put the Internet in the spotlight, why not some other networking technology such as ATM? Most computer networking students have had already significant "hands on" experience with the Internet (e.g., surfing the Web and sending e-mail at the very least) before taking a course on computer networks. We have found that modern-day students in computer science and electrical engineering, being intensive users of the Internet, are enormously curious about what is under the hood of the Internet. Thus, it is easy to get students excited about computer networking when using the Internet as your guiding vehicle. A second reason for the Internet focus is that in recent years computer networking has become synonymous with the Internet. This wasn't the case five-to-ten years ago, when there was a lot of talk about ATM LANs and applications direclty interfacing with ATM (without passing through TCP/IP). But we have now reached the point where just about all data traffic is carried over the Internet or intranets. Furthermore, streaming audio and video have recently become commonplace in the Internet, and someday telephony may be too. Because our book has an Internet focus, it is organized around a five-layer Internet architecture rather than around the more traditional seven-layer OSI architecture. Another unique feature of this book is that it is also top-down in how the content is organized. As we mentioned above, this text, as almost all computer networks textbooks, uses a layered architectural model to organize the content. However, unlike other texts, this text begins at the application-layer and file:///D|/Downloads/Livros/computação/Computer%20Net...n%20Approach%20Featuring%20the%20Internet/preface.htm (1 of 4)20/11/2004 15:51:35 Computer Networking Computer Networking: A Top-Down Approach Featuring the Internet Instructor and student resources for this book are available at http://www.awlonline.com/kurose-ross! file:///D|/Downloads/Livros/computação/Computer%20Network...op-Down%20Approach%20Featuring%20the%20Internet/index.htm20/11/2004 15:51:33 kurose Jim Kurose Department of Computer Science University of Massachusetts Amherst MA 01003 USA [email protected] ph: 413-545-2742, FAX: 413-545-1249 Jim Kurose received a B.A. degree in physics from Wesleyan University in 1978 and his M.S. and Ph.D. degrees in computer science from Columbia University in 1980 and 1984, respectively. He is currently a Professor of Computer Science at the University of Massachusetts, where he is also co-director of the Networking Research Laboratory of the Multimedia Systems Laboratory. He is currently serving a term as Chairman of the Department of Computer Science. Professor Kurose was a Visiting Scientist at IBM Research during the 1990/91 academic year, and at INRIA and at EURECOM, both in Sophia Antipolis, France, during the 1997/98 academic year. His research interests include real-time and multimedia communication, network and operating system support for servers, and modeling and performance evaluation. Dr. Kurose is the past Editor-in-Chief of the IEEE Transactions on Communications and of the IEEE/ACM Transactions on Networking. He has been active in the program committees for IEEE Infocom, ACM SIGCOMM, and ACM SIGMETRICS conferences for a number of years. He is the six-time recipient of the Outstanding Teacher Award from the National Technological University (NTU), the recipient of the Outstanding Teacher Award from the College of Science and Natural Mathematics at the University of Massachusetts, and the recipient of the 1996 Outstanding Teaching Award of the Northeast Association of Graduate Schools.
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