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II. HIGH-SPEED NETWORKS.
III. PERFORMANCEMODELING AND ESTIMATION.
IV. CONGESTION AND TRAFFIC MANAGEMENT.
V. INTERNET ROUTING.
VI. QUALITY OF SERVICE IN IP NETWORKS.
This book aims at helping to disentangle from an immense mass of material the crucial issues and cardinal decisions. Throughout I have set myself to explain faithfully and to the best of my ability what happened and why.
—The World Crisis, Winston Churchill
High-speed networks now dominate both the wide-area network (WAN) and local area network (LAN) markets. In the WAN market, two related trench have appeared. Public and private data networks have evolved from packet switching networks in the 10s and 100s of kbps, to frame relay networks operating at up to 2 Mbps, and now to asynchronous transfer mode (ATM networks operating at 155 Mbps or more. For the Internet and private corporate internets, data rates have also soared, with one noteworthy milestone being the construction of a 155-Mbps backbone in 1996.
For many years, the most common LAN was the 10-Mbps shared Ethernet. Then came the switched Ethernet, which offers a dedicated 10 Mbps to each end system. This was followed by Fast Ethernet at 100 Mbp a and now Gigabit Ethernet and 10-Gbps Ethernet. Recent years have also seen the introduction of Fibre Channel LANs with speeds up to 3.2 Gbps and wireless LANs with speeds up to 54 Mbps.
This rapid introduction of high-speed networks has spurred the development of new applications and has in turn been driven by the popularity o. those applications. Key driving forces have been the increasing use of stir image and video data in applications and the popularity of the World Wide Web.
High-speed networks, including gigabit networks, form the focus of the book. Designissues related to two types of networks occupy our attention: internets based on the Internet Protocol (IP) and the entire TCP/IP protocol suite, and ATM (asynchronous transfer mode) networks. These two networking technologies dominate the high-speed scene and share many common design approaches.
The objective of this book is to provide an up-to-date survey of developments in this area. Central problems that confront the network designer are the need to support multimedia and real-time traffic, the need to control congestion, and the need to provide different levels of quality of service (QoS) to different applications.
This book is intended for both a professional and an academic audience. For the professional interested in this field, the book serves as a basic reference volume and is suitable for self-study.
As a textbook, it is suitable for an advanced undergraduate or graduate course. The book treats a number of advanced topics and provides a brief survey of the required elementary topics. After Parts One and Two, the parts are relatively independent. Fewer parts could be covered for a shorter course, and the parts can be covered in any order.
The book is divided into seven parts:
In addition, the book includes an extensive glossary, a list of frequently used acronyms, and a bibliography. Each chapter includes problems, suggestions for further reading, and pointers to relevant Web sites.
There is a Web page for this book that provides support for students and instructors. The page includes links to relevant sites, transparency masters of figures and tables in the book in PDF (Adobe Acrobat) format, PowerPoint slides, and signup information for the book's internet mailing list. The Web page is at WilliamStallings.com/HsNet2e.html; see Chapter 1 for more details. An Internet mailing list has been set up so that instructors using this book can exchange information, suggestions, and questions with each other and with the author. As soon as typos or other errors are discovered, an errata list for this book will be available at WilliamStallings.com. Finally, I maintain the Computer Science Student Resource Site.
The book includes a description of Sockets (Appendix B), and the instructor's manual includes a set of programming projects. The appendix includes a concise overview of Sockets, a discussion of the importance of this facility and a short primer on how to use Sockets, as well as pointers for getting more information on the Web. Sockets programming is an "easy" topic and one that can result in very satisfying hands-on projects for students.
In the four years since the first edition of this book was published, the field has seen continued innovations and improvements. In this edition, I try to capture these changes while maintaining a broad and comprehensive coverage of the entire field. To begin the process of revision, the first edition of this book was extensively reviewed by a number of professors who teach the subject and by professionals working in the field. The result is that, in many places, the narrative has been clarified and tightened, and illustrations have been improved. Also, a number of new "field-tested" problems have been added.
Beyond these refinements to improve pedagogy and user friendliness, the technical content of the book has been updated throughout, to reflect the ongoing changes in this exciting field. In addition, the book has been reorganized to provide a better grouping of topics. Some of the most noteworthy changes are the following: