Data and Computer Communications

knowledge AND COMPUTER COMMUNICATIONS Eighth Edition William St completelyings Upper g competent roof River, New Jersey 07458 Library of Congress Cataloging-in-Publication education on File Vice President and chromatography column accostr, ECS Marcia J. Horton Executive Editor Tracy Dunkelberger Assistant Editor Ca exercise Snyder Editorial Assistant Christianna lee side Executive Managing Editor Vince OBrien Managing Editor Camille Trentacoste Production Editor Rose Kernan Director of Creative operate Paul Belfanti Creative Director Juan Lopez C everywhere Designer Bruce Kenselaar Managing Editor,AV solicitude and Production Patricia Burns 2007 Pearson pedagogy, Inc.Pearson Prentice dorm Pearson determineing, Inc. Upper Saddle River, NJ 07458 Art Editor Gregory Dulles Director, Image Resource Center Melinda Reo Manager, Rights and Permissions Zina Arabia Manager,Visual investigate Beth Brenzel Manager, Cover Visual Research and Permissions Kargonn Sanatar Manufactur ing Manager, ESM Alexis Heydt-Long Manufacturing Buyer Lisa McDo healthful Executive Marketing Manager Robin OBrien Marketing Assistant mackintosh Patterson e truly rights reserved. No smash of this hold back may be reproduced in any form or by any means, without permission in writing from the publisher.Pearson Prentice H tout ensemble is a trademark of Pearson Education, Inc. All other tradmarks or product names atomic number 18 the property of their respective owners. The agent and publisher of this accommodate endure apply their best efforts in preparing this hand. These efforts allow the phylogeny, research, and testing of the theories and programs to determine their effectiveness. The author and publisher strive no warranty of any kind, expressed or implied, with regard to these programs or the documentation contained in this fasten on hold. The author and publisher sh altogether not be liable in any event for incidental or of import amages in connection with, or arising out of, the furnishing, mathematical process, or subprogram of these programs. Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 ISBN 0-13-243310-9 Pearson Education Ltd. , London Pearson Education Australia Pty. Ltd. , Sydney Pearson Education Singapore, Pte. Ltd. Pearson Education northwestern Asia Ltd. , Hong Kong Pearson Education Canada, Inc. , Toronto Pearson Educaci n de Mexico, S. A. de C. V. Pearson Education Japan, Tokyo Pearson Education Malaysia, Pte. Ltd. Pearson Education, Inc. , Upper Saddle River, New Jersey For my scin troughating wife ATS entanglement SITE FOR selective information AND COMPUTER COMMUNICATIONS, ordinal chance variable The Web station at WilliamStallings. com/DCC/DCC8e. html interprets encourage for teachers and disciples using the give-and- arrive. It includes the adjacent elements. Course back Materials The line of descent support materials include Copies of figures from the book in PDF format A exact puzzle of course notes in PDF format suitable for student handout or for persona as viewgraphs A trammel of PowerPoint slides for use as lecture aids Computer Science Student Support turn up contains a number of intimacys and documents that the student may find useful in his/her ongoing calculator skill education.The site includes a review of basic, applicable mathematics advice on research, writing, and doing cookery problems cerebrate to computer accomplishment research resources, such as report repositories and bibliographies and other useful links. An errata sheet for the book, updated at roughly monthly T DCC Courses The DCC8e Web site includes links to Web sites for courses taught using the book. These sites batch provide useful ideas to the highest degree scheduling and upshot ordering, as well as a number of useful handouts and other materials. useful Web Sites The DCC8e Web site includes links to relevant Web sites, unionised by chapter.The links vertebral column a broad spectrum of topics and lead enable students to explore beatly issues in greater depth. iv WEB SITE FOR info AND COMPUTER COMMUNICATIONS, EIGHTH EDITION v Supplemental Documents The DCC8e Web site includes a number of documents that expand on the treatment in the book. Topics include standards presidencys, Sockets, TCP/IP checksum, ASCII, and the sampling theorem. net income dismounting List An net mailing list is maintained so that instructors using this book can flip-flop information, suggestions, and questions with each other and the author.Subscription information is provided at the books Web site. manikin and copy Tools The Web site includes links to the cnet Web site and the modeling tools Web site. These packages can be utilise to analyze and experiment with protocol and ne devilrk design issues. Each site includes downloadable softw be and background information. The instructors manual includes to a greater extent(prenominal) information on loading and us ing the computer softw atomic number 18 and suggested student projects. This rapscallion intentionally left blank confine Web Site for selective information and Computer conferences stick in xv 1 iv Chapter 0 Readers and Instructors Guide 0. mustinesser in of the Book 2 0. 2 Roadmap 3 0. 3 cyberspace and Web Resources 5 0. 4 Standards 6 PART ONE OVERVIEW 9 Chapter 1 Data Communications, Data meshworking, and the meshing 10 1. 1 Data Communications and Ne devilrking for Todays Enterprise 12 1. 2 A Communications dumb put together 16 1. 3 Data Communications 19 1. 4 Ne twainrks 22 1. 5 The net 25 1. 6 An instance Configuration 29 Chapter 2 communication theory protocol Architecture, TCP/IP, and net profit-Based Applications 2. 1 The Need for a protocol Architecture 33 2. 2 The TCP/IP Protocol Architecture 34 2. 3 The OSI Model 42 2. 4 Standardization within a Protocol Architecture 44 2. Traditional profits-Based Applications 48 2. 6 Mul clippingdia 48 2. 7 Recommended variant and Web Sites 53 2. 8 key fruit Terms, brush up Questions, and Problems 54 concomitant 2A The Trivial File Transfer Protocol 57 PART TWO DATA COMMUNICATIONS 62 Chapter 3 Data contagious disease 65 3. 1 Concepts and Terminology 67 3. 2 Analog and digital Data Transmission 78 3. 3 Transmission Impairments 86 3. 4 teleph one and only(a) line Capacity 91 3. 5 Recommended yarn and Web Site 96 3. 6 break Terms, reexamine Questions, and Problems addendum 3A Decibels and foretell Strength 99 Chapter 4 Transmission Media 102 4. Guided Transmission Media 104 4. 2 radiocommunication Transmission 117 4. 3 radio set Propagation 125 32 96 vii viii CONTENTS 4. 4 4. 5 4. 6 Line-of-Sight Transmission 129 Recommended adaptation and Web Sites 133 Key Terms, recap Questions, and Problems 134 Chapter 5 Signal Encoding Techniques 138 5. 1 Digital Data, Digital Signals 141 5. 2 Digital Data, Analog Signals 151 5. 3 Analog Data, Digital Signals 162 5. 4 Analog Data, Analog Signals 1 68 5. 5 Recommended Reading clxxv 5. 6 Key Terms, Review Questions, and Problems 175 Chapter 6 Digital Data Communication Techniques 180 6. Asynchronous and Synchronous Transmission 182 6. 2 Types of Errors 186 6. 3 Error Detection 186 6. 4 Error Correction 196 6. 5 Line Configurations 201 6. 6 Recommended Reading 203 6. 7 Key Terms, Review Questions, and Problems 204 Chapter 7 Data Link discover Protocols 207 7. 1 Flow Control 209 7. 2 Error Control 216 7. 3 High-Level Data Link Control (HDLC) 222 7. 4 Recommended Reading 228 7. 5 Key Terms, Review Questions, and Problems 229 Appendix 7A Performance Issues 232 Chapter 8 Multiplexing 239 8. 1 Frequency-Division Multiplexing 242 8. 2 Synchronous Time-Division Multiplexing 248 8. Statistical Time-Division Multiplexing 258 8. 4 Asymmetric Digital Subscriber Line 265 8. 5 xDSL 268 8. 6 Recommended Reading and Web Sites 269 8. 7 Key Terms, Review Questions, and Problems 270 Chapter 9 Spread Spectrum 274 9. 1 The Concept of Spread Spectr um 276 9. 2 Frequency Hopping Spread Spectrum 277 9. 3 Direct Sequence Spread Spectrum 282 9. 4 Code-Division Multiple Access 287 9. 5 Recommended Reading and Web Site 290 9. 6 Key Terms, Review Questions, and Problems 291 CONTENTS ix PART THREE WIDE AREA NETWORKS 295 Chapter 10 go Switching and Packet Switching 297 10. Switched Communications Networks 299 10. 2 Circuit Switching Networks 301 10. 3 Circuit Switching Concepts 304 10. 4 Softswitch Architecture 307 10. 5 Packet-Switching Principles 309 10. 6 X. 25 317 10. 7 pattern Relay 319 10. 8 Recommended Reading and Web Sites 324 10. 9 Key Terms, Review Questions, and Problems 325 Chapter 11 Asynchronous Transfer Mode 328 11. 1 Protocol Architecture 329 11. 2 standard atmosphere Logical Connections 331 11. 3 cash dispenser Cells 335 11. 4 Transmission of ATM Cells 340 11. 5 ATM Service Categories 345 11. 6 Recommended Reading and Web Sites 348 11. Key Terms, Review Questions, and Problems 349 Chapter 12 Routing in Switched Net works 351 12. 1 Routing in Packet-Switching Networks 352 12. 2 Examples Routing in ARPANET 362 12. 3 Least-Cost Algorithms 367 12. 4 Recommended Reading 372 12. 5 Key Terms, Review Questions, and Problems 373 Chapter 13 congestion Control in Data Networks 377 13. 1 Effects of Congestion 379 13. 2 Congestion Control 383 13. 3 Traffic Management 386 13. 4 Congestion Control in Packet-Switching Networks 13. 5 Frame Relay Congestion Control 388 13. 6 ATM Traffic Management 394 13. 7 ATM-GFR Traffic Management 406 13. Recommended Reading 409 13. 9 Key Terms, Review Questions, and Problems 410 Chapter 14 Cellular Wire little Networks 413 14. 1 Principles of Cellular Networks 415 14. 2 First Generation Analog 427 14. 3 Second Generation CDMA 429 14. 4 Third Generation Systems 437 14. 5 Recommended Reading and Web Sites 440 14. 6 Key Terms, Review Questions, and Problems 441 387 x CONTENTS PART FOUR topical anaesthetic AREA NETWORKS 444 Chapter 15 Local domain of a function Network Over view 446 15. 1 Background 448 15. 2 Topologies and Transmission Media 451 15. 3 local anaesthetic anesthetic battle scene of action communicate Protocol Architecture 457 15. 4 Bridges 465 15. 5 Layer 2 and Layer 3 Switches 473 15. Recommended Reading and Web Site 478 15. 7 Key Terms, Review Questions, and Problems 479 Chapter 16 High-Speed LANs 482 16. 1 The issuance of High-Speed LANs 483 16. 2 Ethernet 485 16. 3 Fibre Channel 500 16. 4 Recommended Reading and Web Sites 504 16. 5 Key Terms, Review Questions, and Problems 506 Appendix 16A Digital Signal Encoding for LANs 508 Appendix 16B Performance Issues 514 Appendix 16C Scrambling 518 Chapter 17 Wireless LANs 522 17. 1 Overview 523 17. 2 Wireless LAN Technology 528 17. 3 IEEE 802. 11 Architecture and work 531 17. 4 IEEE 802. 11 Medium Access Control 535 17. 5 IEEE 802. 1Physical Layer 543 17. 6 IEEE 802. 11 tri entirelye Considerations 549 Recommended Reading and Web Sites 550 17. 7 17. 8 Key Terms, Review Questions, and Pr oblems 551 PART FIVE lucre AND ship PROTOCOLS Chapter 18 Inter profit Protocols 556 18. 1 Basic Protocol Functions 558 18. 2 Principles of Inter neting 566 18. 3 Internet Protocol Operation 569 18. 4 Internet Protocol 576 18. 5 IPv6 586 18. 6 Virtual Private Networks and IP Security 596 18. 7 Recommended Reading and Web Sites 599 18. 8 Key Terms, Review Questions, and Problems 600 Chapter 19 Internetwork Operation 603 19. 1 Multicasting 605 19. Routing Protocols 614 19. 3 Integrated Services Architecture 625 19. 4 Differentiated Services 636 554 CONTENTS xi 19. 5 19. 6 19. 7 19. 8 Service Level Agreements 645 IP Performance Metrics 646 Recommended Reading and Web Sites 649 Key Terms, Review Questions, and Problems 651 657 Chapter 20 hug drug Protocols 655 20. 1 Connection-Oriented Transport Protocol Mechanisms 20. 2 TCP 674 20. 3 TCP Congestion Control 683 20. 4 UDP 693 20. 5 Recommended Reading and Web Sites 695 Key Terms, Review Questions, and Problems 695 20. 6 PART SIX Chapte r 21 21. 1 21. 2 21. 3 21. 4 21. 5 21. 6 21. 7 21. 8 21. INTERNET APPLICATIONS 699 Network Security 701 Security Requirements and Attacks 703 Confidentiality with Conventional Encryption 705 Message Authentication and Hash Functions 713 Public-Key Encryption and Digital Signatures 720 take prisoner Socket Layer and Transport Layer Security 727 IPv4 and IPv6 Security 732 Wi-Fi defend Access 737 Recommended Reading and Web Sites 739 Key Terms, Review Questions, and Problems 740 Chapter 22 Internet ApplicationsElectronic Mail and Network Management 22. 1 Electronic Mail SMTP and MIME 745 22. 2 Network Management SNMP 760 22. 3 Recommended Reading and Web Sites 770 22. Key Terms, Review Questions, and Problems 771 743 Chapter 23 Internet ApplicationsInternet Directory Service and World Wide Web 23. 1 Internet Directory Service DNS 774 23. 2 Web Access HTTP 784 23. 3 Recommended Reading and Web Sites 795 23. 4 Key Terms, Review Questions, and Problems 796 Chapter 24 Internet Applicatio nsMultimedia 799 24. 1 Audio and Video Compression 800 24. 2 Real-Time Traffic 808 24. 3 interpretive program Over IP and Multimedia SupportSIP 811 24. 4 Real-Time Transport Protocol (RTP) 820 24. 5 Recommended Reading and Web Sites 831 24. 6 Key Terms, Review Questions, and Problems 832 773 ii CONTENTS APPENDICES 835 Appendix A Fourier psychoanalysis 835 A. 1 Fourier Series Representation of Periodic Signals 836 A. 2 Fourier Transform Representation of Aperiodic Signals 837 A. 3 Recommended Reading 840 Appendix B Projects for Teaching Data and Computer Communications B. 1 practical(a) Exercises 842 B. 2 Sockets Projects 843 B. 3 Ethereal Projects 843 B. 4 Simulation and Modeling Projects 844 B. 5 Performance Modeling 844 B. 6 Research Projects 845 B. 7 Reading/Report Assignments 845 B. 8 Writing Assignments 845 B. 9 Discussion Topics 846 References Index 858 ONLINE APPENDICES WilliamStallings. om/DCC Appendix C Sockets A Programmers Introduction C. 1 Versions of Sockets C. 2 Soc kets, Socket Descriptors, Ports, and Connections The Client/Server Model of Communication C. 3 C. 4 Sockets Elements C. 5 Stream and Datagram Sockets C. 6 Run-Time Program Control C. 7 Remote Execution of a Windows Console Application Appendix D Standards Organizations D. 1 The Importance of Standards D. 2 Standards and Regulation D. 3 Standards-Setting Organizations Appendix E Appendix F The International Reference Alphabet Proof of the Sampling Theorem 847 841 Appendix G Physical-Layer Interfacing G. 1 V. 24/EIA-232-F G. ISDN Physical Interface Appendix H The OSI Model H. 1 The Model H. 2 The OSI Layers CONTENTS xiii Appendix I Queuing Effects I. 1 Queuing Models I. 2 Queuing Results Appendix J Orthogonality, Correlation, and Autocorrelation J. 1 Correlation and Autocorrelation J. 2 Orthogonal Codes Appendix K The TCP/IP Checksum K. 1 Ones-Complement Addition K. 2 Use in TCP and IP Appendix L TCP/IP Example Appendix M Uniform Resource Locators (URLs) and Uniform Resource Identifie rs (URIs) M. 1 Uniform Resource Locator M. 2 Uniform Resource Identifier M. 3 To Learn More Appendix N Glossary Augmented Backus-Naur FormThis summon intentionally left blank PREFACE Begin at the beginning and go on till you come to the end then stop. Alice in Wonderland, Lewis Carroll OBJECTIVES This book attempts to provide a unified overview of the broad issue of entropy and computer communication theory. The organization of the book reflects an attempt to break this grand subject into comprehensible move and to build, piece by piece, a survey of the state of the art. The book emphasizes basic principles and topics of fundamental importance concerning the engineering science and architecture of this field and provides a detailed word of honor of leading-edge topics.The following basic themes serve to unify the backchat Principles Although the cooking stove of this book is broad, there be a number of basic principles that appear repeatedly as themes and that unify thi s field. Examples are multiplexing, flow mince, and error control. The book highlights these principles and contrasts their application in specialized areas of technology. Design approaches The book examines alternative approaches to meeting specific communication requirements. Standards Standards have come to assume an more and more important, indeed dominant, role in this field.An understanding of the current status and future direction of technology requires a comprehensive discussion of the get in touchd standards. INTENDED AUDIENCE The book is intended for both an academic and a paid 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 can be used for a one-semester or two-semester course. It covers the material in Networking (NET), a nerve center area in the Information Technology body of k straightledge, which is part of the Draft ACM/IEEE/AIS Computing Curricula 2005.T he book similarwise covers the material in Computer Networks (CE-NWK), a core area in Computer Engineering 2004 curriculum Guidelines from the ACM/IEEE Joint line Force on Computing Curricula. PLAN OF THE TEXT The book is divided into half a dozen move (see Chapter 0) Overview Data Communications Wide Area Networks xv xvi PREFACE Local Area Networks Internet and Transport Protocols Internet Applications In addition, the book includes an extensive glossary, a list of frequently used acronyms, and a bibliography. Each chapter includes problems and suggestions for further reading.The chapters and separate of the book are sufficiently modular to provide a great deal of flexibleness in the design of courses. See Chapter 0 for a number of detailed suggestions for both top-down and bottom-up course strategies. INSTRUCTIONAL SUPPORT MATERIALS To support instructors, the following materials are provided Solutions manual Solutions to all end-of-chapter Review Questions and Probl ems. PowerPoint Slides A set of slides covering all chapters, suitable for use in lecturing. PDF points Reproductions of all figures and tables from the book. Projects Manual Suggested project assignments for all of the project categories listed below. Instructors may contact their Pearson Education or Prentice Hall representative for access to these materials. In addition, the books Web site supports instructors with Links to Webs sites for other courses existence taught using this book Sign up information for an Internet mailing list for instructors INTERNET serve FOR INSTRUCTORS AND STUDENTS There is a Web site for this book that provides support for students and instructors.The site includes links to other relevant sites, transparency masters of figures in the book, and sign-up information for the books Internet mailing list. The Web rascal is at WilliamStallings. com/DCC/DCC8e. html see the section, Web Site for Data and Computer Communications, preceding the Table of C ontents, for more information. An Internet mailing list has been set up so that instructors using this book can convert information, suggestions, and questions with each other and with the author. As curtly as typos or other errors are discover, an errata list for this book will be acquirable at WilliamStallings. om. PROJECTS AND OTHER STUDENT EXERCISES For many instructors, an important component of a info communication theory or networking course is a project or set of projects by which the student gets hands-on experience to reinforce concepts from the text. This book provides an unparalleled degree of support for including a projects component in the course. The instructors postscript not only includes guidance on how to assign and social organisation the projects unless alike includes a set of Users PREFACE xvii Manuals for various project types incontrovertible specific assignments, all written especially for this book.Instructors can assign work in the following area s Practical exercises Using network commands, the student gains experience in network connectivity. Sockets programming projects The book is supported by a detailed description of Sockets available at the books Web site. The Instructors supplement includes a set of programming projects. Sockets programming is an easy topic and one that can result in very satisfying hands-on projects for students. Ethereal projects Ethereal is a protocol analyzer that enables students to study the behavior of protocols. Simulation projects The student can use the simulation package cnet to analyze network behavior. Performance modeling projects both performance modeling techniques are provided a tools package and OPNET. Research projects The instructors supplement includes a list of suggested research projects that would involve Web and literature searches. Reading/report assignments The instructors supplement includes a list of papers that can be assigned for reading and writing a report, co nfident(p) suggested assignment wording. Writing assignments The instructors supplement includes a list of writing assignments to facilitate larn the material. Discussion topics These topics can be used in a classroom, chat room, or message senesce environment to explore certain areas in greater depth and to foster student collaboration. This diverse set of projects and other student exercises enables the instructor to use the book as one component in a rich and varied learning experience and to tailor a course plan to meet the specific requisites of the instructor and students. See Appendix B for details.WHATS NEW IN THE EIGHTH EDITION This eighth chance variable is seeing the light of day less than four eld after the matter of the viith edition. During that time, the pace of change in this field continues unabated. In this late edition, I try to catch up with these changes while maintaining a broad and comprehensive coverage of the entire field. To begin the process of r evision, the seventh edition of this book was extensively reviewed by a number of professors who teach the subject. The result is that, in many places, the register 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 substance ab drug user friendliness, there have been major substantive changes doneout the book. Every chapter has been revised, new chapters have been added, and the overall organization of the book has changed. Highlights include Updated coverage of Giga catch Ethernet and 10-Gbps Ethernet New details of these standards are provided. Updated coverage of WiFi/IEEE 802. 11 radiocommunication LANs IEEE 802. 11 and the associate WiFi specifications have continued to evolve. viii PREFACE New coverage of IP performance metrics and service level agreements (SLAs) These aspects of Quality of Service (QoS) and performance monitoring are increa singly important. Address Resolution Protocol (ARP) This important protocol is now covered. New coverage of TCP Tahoe, Reno, and NewReno These congestion control algorithms are now common in roughly commercial implementations. Expanded coverage of warranter Chapter 21 is more detailed other chapters provide overview of security for the relevant topic.Among the new topics are Wi-Fi Protected Access (WPA) and the secure hash algorithm SHA-512. Domain Name System (DNS) This important scheme is now covered. New coverage of multimedia Introductory section in Chapter 2 detailed coverage in Chapter 24. Topics covered include moving picture compression, SIP, and RTP. Online appendices Fourteen online appendices provide additional detail on important topics in the text, including Sockets programming, queuing models, the Internet checksum, a detailed pillow fictional character of TCP/IP operation, and the BNF grammar.In addition, throughout the book, virtually every topic has been u pdated to reflect the developments in standards and technology that have occurred since the publication of the seventh edition. ACKNOWLEDGMENTS This new edition has benefited from review by a number of people, who gave generously of their time and expertise. The following people reviewed all or a abundant part of the manuscript Xin Liu- (UC, Davis), Jorge Cobb, Andras Farago, Dr. Prasant Mohapatra (UC Davis), Dr. Jingxian Wu (Sonoma State University), G. R.Dattareya (UT Dallas), Guanling Chen (Umass, Lowell), Bob Roohaprvar (Cal State East Bay), Ahmed Banafa (Cal State East Bay), Ching-Chen Lee (CSU Hayward), and Daji Qaio (Iowa State). Thanks also to the many people who provided detailed technical reviews of a single chapter Dave Tweed, Bruce Lane, Denis McMahon, Charles Freund, Paul Hoadley, Stephen Ma, Sandeep Subramaniam, Dragan Cvetkovic, Fernando Gont, Neil Giles, Rajesh Thundil, and plow Jones. In addition, Larry Owens of California State University and Katia Obraczka of t he University of Southern California provided few homework problems.Thanks also to the following contributors. Zornitza Prodanoff of the University of North Florida prepared the appendix on Sockets programming. Michael Harris of the University of South Florida is responsible for the Ethereal exercises and users guide. Lawrie Brown of the Australian Defence Force Academy of the University of New South Wales produced the PPT lecture slides. Finally, I would like to thank the many people responsible for the publication of the book, all of whom did their usual excellent job.This includes the staff at Prentice Hall, particularly my editor Tracy Dunkelberger, her assistants Christianna Lee and Carole Snyder, and production tutor Rose Kernan. Also, Patricia M. Daly did the copy editing. CHAPTER refS AND INSTRUCTORS GUIDE 0. 1 0. 2 0. 3 0. 4 Outline of the Book Roadmap Internet and Web Resources Standards 0 1 2 CHAPTER 0 / READERS AND INSTRUCTORS GUIDE In the meanwhile, then, demanded L i-loe, relate to me the story to which reference has been do, thereby proving the truth of your assertion, and at the identical time affording n entertainment of a slightlywhat exceptional kind. The shadows lengthen, replied Kai Lung, but as the narrative in question is of an inconspicuous span I will raise no barrier over against your flattering request, especially as it indicates an awakening taste insofar unexpected. Kai Lungs Golden Hours, Earnest Bramah This book, with its accompanying Web site, covers a lot of material. Here we give the contributor some basic background information. 0. 1 OUTLINE OF THE BOOK The book is organized into five parts get or so One. Overview Provides an introduction to the range of topics covered in the book.This part includes a general overview of data communications and networking and a discussion of protocols, OSI, and the TCP/IP protocol suite. partly twain. Data Communications Concerned earlier with the permute of data amidst two directly connected devices. Within this restricted scope, the key aspects of contagion, interfacing, link control, and multiplexing are examined. come apart trine. Wide Area Networks Examines the internal mechanisms and user-network interfaces that have been developed to support voice, data, and multimedia communications over abundant-distance networks.The traditional technologies of packet switching and circuit switching are examined, as well as the more recent ATM and receiving set large-minded area networks. Separate chapters are disposed to routing and congestion control issues that are relevant both to switched data networks and to the Internet. Part Four. Local Area Networks Explores the technologies and architectures that have been developed for networking over shorter distances. The transmission media, topologies, and medium access control protocols that are the key ingredients of a LAN design are explored and specific standardized LAN systems examined.Part Five. Netw orking Protocols Explores both the architectural principles and the mechanisms postulate for the exchange of data among computers, workstations, servers, and other data treat devices. Much of the material in this part relates to the TCP/IP protocol suite. Part Six. Internet Applications Looks at a range of applications that operate over the Internet. A more detailed, chapter-by-chapter summary of each part appears at the beginning of that part. 0. 2 / ROADMAP 3 0. 2 ROADMAP Course EmphasisThe material in this book is organized into four broad categories data transmission and communication communications networks network protocols and applications and security. The chapters and parts of the book are sufficiently modular to provide a great deal of flexibility in the design of courses. The following are suggestions for triad different course designs Fundamentals of Data Communications separate One (overview) and Two (data communications) and Chapters 10 and 11 (circuit switching, p acket switching, and ATM). Communications Networks If the student has a basic background in data communications, then this course could cover Parts One (overview), trine (WAN), and Four (LAN). Computer Networks If the student has a basic background in data communications, then this course could cover Part One (overview), Chapters 6 and 7 (data communication techniques and data link control), Part Five (protocols), and part or all of Part Six (applications). In addition, a more streamlined course that covers the entire book is possible by eliminating certain chapters that are not indwelling on a first reading.Chapters that could be optional are Chapters 3 (data transmission) and 4 (transmission media), if the student has a basic understanding of these topics Chapter 8 (multiplexing) Chapter 9 (spread spectrum) Chapters 12 through 14 (routing, congestion control, cellular networks) Chapter 18 (internetworking) and Chapter 21 (network security). Bottom-Up versus Top-Down The book is organized in a modular fashion. After reading Part One, the other parts can be read in a number of possible sequences. design 0. 1a shows the bottom-up approach provided by reading the book from scarecrow to back. With this approach, each part builds on the material in the previous part, so that it is always clear how a given layer of functionality is supported from below. There is more material than can be comfortably covered in a single semester, but the books organization makes it easy to eliminate some chapters and maintain the bottom-up sequence. Figure 0. 1b suggests one approach to a survey course.Some readers, and some instructors, are more comfortable with a top-down approach. After the background material (Part One), the reader continues at the application level and works down through the protocol layers. This has the advantage of instanter focusing on the most obvious part of the material, the applications, and then seeing, progressively, how each layer is supported b y the next layer down. Figure 0. 1c is an modelling of a comprehensive treatment and Figure 0. 1d is an example of a survey treatment. 4 CHAPTER 0 / READERS AND INSTRUCTORS GUIDEPart One Overview Part Two Data Communications Part Three Wide Area Networks Part Four Local Area Networks Part Five Internet and Transport Protocols Part Six Internet Applications (a) A bottom-up approach Part One Overview Chapter 18 The Internet Protocol Part Six Internet Applications Part Five TCP/IP Part Three WANs Part Four LANs Part Two Data Communications (c) A top-down approach (d) other top-down approach (b) other bottom-up approach Part One Overview Chapter 18 The Internet Protocol Part Six Internet Applications Part Five TCP/IP Part Three WANs (10, 12) Part Four LANs (15) Part One Overview (1, 2) Part Two Data Communications (3, 6, 7, 8) Part Three WANs (10, 12) Part Four LANs (15) Part Five TCP/IP (18, 20) Figure 0. 1 Suggested Reading Orders Finally, it is possible to ingest chapters to refl ect specific teaching objectives by not sticking to a strict chapter ordering. We give two examples used in courses taught with the seventh edition.One course used the sequence Part One (Overview) Chapter 3 (Data Transmission) Chapter 6 (Digital Data Communications Techniques) Chapter 7 (Data Link Control) Chapter 15 (LAN Overview) Chapter 16 (High-Speed LANs) Chapter 10 (Circuit and Packet Switching) Chapter 12 (Routing) Chapter 18 (Internet Protocols) and Chapter 19 (Internet Operation). The other course used the sequence Part One (Overview) Chapter 3 (Data Transmission) Chapter 4 (Guided and Wireless Transmission) Chapter 5 (Signal Encoding Techniques) Chapter 8 (Multiplexing) Chapter 15 (LAN 0. 3 / INTERNET AND WEB RESOURCES 5 Overview) Chapter 16 (High-Speed LANs) Chapter 10 (Circuit and Packet Switching) Chapter 20 (Transport Protocols) Chapter 18 (Internet Protocols) and Chapter 19 (Internet Operation). 0. 3 INTERNET AND WEB RESOURCES There are a number of resources available on the Internet and the Web to support this book and to help one animation up with developments in this field.Web Sites for This Book A special Web page has been set up for this book at WilliamStallings. com/DCC/ DCC8e. html. See the two-page layout at the beginning of this book for a detailed description of that site. As soon as any typos or other errors are discovered, an errata list for this book will be available at the Web site. Please report any errors that you spot. Errata sheets for my other books are at WilliamStallings. com. I also maintain the Computer Science Student Resource Site, at WilliamStallings. com/StudentSupport. html. The purpose of this site is to provide documents, information, and links for computer science students and professionals.Links and documents are organized into four categories Math Includes a basic math refresher, a queuing analysis primer, a number system primer, and links to numerous math sites How-to Advice and guidance for solving homework problems, writing technical reports, and preparing technical presentations Research resources Links to important collections of papers, technical reports, and bibliographies Miscellaneous A course of useful documents and links Other Web Sites There are numerous Web sites that provide information related to the topics of this book. In subsequent chapters, pointers to specific Web sites can be found in the Recommended Reading and Web Sites section. Because the addresses for Web sites tend to change frequently, I have not included URLs in the book. For all of the Web sites listed in the book, the appropriate link can be found at this books Web site. Other links not mentioned in this book will be added to the Web site over time.The following are Web sites of general interest related to data and computer communications Network World Information and links to resources about data communications and networking. IETF Maintains archives that relate to the Internet and IETF activities. I ncludes keyword-indexed library of RFCs and draft documents as well as many other documents related to the Internet and related protocols. 6 CHAPTER 0 / READERS AND INSTRUCTORS GUIDE Vendors Links to thousands of sturdyware and software vendors who currently have Web sites, as well as a list of thousands of computer and networking companies in a phone directory. IEEE Communications Society nigh way to keep up on conferences, publications, and so on. ACM Special Interest Group on Communications (SIGCOMM) Good way to keep up on conferences, publications, and so on. International telecoms Union Contains a listing of ITU-T recommendations, plus information on obtaining ITU-T documents in hard copy or on DVD. International Organization for Standardization Contains a listing of ISO standards, plus information on obtaining ISO documents in hard copy or on CD-ROM. CommWeb Links to vendors, tutorials, and other useful information. CommsDesign disseminate of useful articles, tutoria ls, and product information. A bit hard to navigate, but worthwhile. USENET Newsgroups A number of USENET newsgroups are devoted to some aspect of data communications, networks, and protocols.As with virtually all USENET groups, there is a high noise-to- star sign ratio, but it is worth experimenting to see if any meet your needs. The most relevant are as follows comp. dcom. lans, comp. dcom. lans. misc General discussions of LANs comp. dcom. lans. ethernet Covers Ethernet, Ethernet-like systems, and the IEEE 802. 3 CSMA/CD standards comp. std. wireless General discussion of wireless networks, including wireless LANs comp. security. misc Computer security and encryption comp. dcom. cell-relay Covers ATM and ATM LANs comp. dcom. frame-relay Covers frame relay networks comp. dcom. net-management Discussion of network management applications, protocols, and standards comp. rotocols. tcp-ip The TCP/IP protocol suite 0. 4 STANDARDS It has long been accepted in the telecommunicat ions industriousness that standards are required to govern the physical, electrical, and procedural characteristics of communication equipment. In the past, this view has not been embraced by the computer industry. Whereas communication equipment vendors recognize that their 0. 4 / STANDARDS 7 equipment will mainly interface to and communicate with other vendors equipment, computer vendors have traditionally attempted to monopolize their customers. The proliferation of computers and distributed processing has make that an untenable position.Computers from different vendors must communicate with each other and, with the ongoing evolution of protocol standards, customers will no longer accept special-purpose protocol conversion software development. The result is that standards now permeate all of the areas of technology discussed in this book. There are a number of advantages and disadvantages to the standards-making process. We list here the most inter-group communication ones. Th e principal advantages of standards are as follows A standard assures that there will be a giving market for a particular piece of equipment or software. This encourages mass production and, in some cases, the use of bountiful-scale-integration (LSI) or very-large-scale-integration (VLSI) techniques, resulting in lower costs. A standard allows products from multiple vendors to communicate, giving the purchaser more flexibility in equipment selection and use. The principal disadvantages are as follows A standard tends to freeze the technology. By the time a standard is developed, subjected to review and compromise, and promulgated, more efficient techniques are possible. There are multiple standards for the same thing. This is not a disadvantage of standards per se, but of the current way things are done. Fortunately, in recent years the various standards-making organizations have begun to cooperate more closely. Nevertheless, there are unperturbed areas where multiple conflicti ng standards exist.Throughout this book, we decipher the most important standards in use or being developed for various aspects of data and computer communications. Various organizations have been involved in the development or promotion of these standards. The following are the most important (in the current context) of these organizations Internet Society The Internet SOCiety (ISOC) is a professional membership familiarity with more than 150 organizational and 6000 individual members in over 100 countries. It provides leadership in addressing issues that exhibit the future of the Internet and is the organization home for the groups responsible for Internet infrastructure standards, including the Internet Engineering Task Force (IETF) and the Internet Architecture Board (IAB).All of the RFCs and Internet standards are developed through these organizations. IEEE 802 The IEEE (Institute of Electrical and Electronics Engineers) 802 LAN/MAN Standards Committee develops local area network standards and metropolitan area network standards. The most astray used standards are for the Ethernet family, wireless LAN, bridging, and virtual bridged LANs. An individual working group provides the focus for each area. 8 CHAPTER 0 / READERS AND INSTRUCTORS GUIDE ITU-T The International Telecommunication Union (ITU) is an multinational organization within the United Nations System where governments and the private sector coordinate global telecom networks and services.The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors of the ITU. ITU-Ts mission is the production of standards covering all handle of telecommunications. ATM Forum The ATM Forum is an international nonprofit organization formed with the objective of accelerating the use of ATM (asynchronous expatriation mode) products and services through a rapid convergence of interoperability specifications. In addition, the Forum promotes industry cooperation and awareness. ISO The I nternational Organization for Standardization (ISO)1 is a worldwide federation of national standards bodies from more than 140 countries, one from each country.ISO is a nongovernmental organization that promotes the development of standardization and related activities with a view to facilitating the international exchange of goods and services, and to developing cooperation in the spheres of intellectual, scientific, technological, and economic activity. ISOs work results in international agreements that are published as International Standards. A more detailed discussion of these organizations is contained in Appendix D. 1 ISO is not an acronym (in which case it would be IOS), but a word, derived from the Greek, meaning equal. PART ONE Overview The purpose of Part One is to provide a background and context for the remainder of this book. The broad range of topics that are encompassed in the field of data and computer communications is introduced, and the fundamental concepts of pr otocols and protocol architectures are examined.ROAD MAP FOR PART ONE Chapter 1 Data Communications, Data Networks, and The Internet Chapter 1 provides an overview of Parts Two through Four of the book, giving the big picture. In essence, the book deals with four topics data communications over a transmission link wide area networks local area networks and protocols and the TCP/IP protocol architecture. Chapter 1 provides a preview of the first three of these topics. Chapter 2 Protocol Architecture, TCP/IP, and Internet-Based Applications Chapter 2 discusses the concept protocol architectures. This chapter can be read immediately following Chapter 1 or deferred until the beginning of Part Three, Four, or Five.After a general introduction, the chapter deals with the two most important protocol architectures the Open Systems Interconnection (OSI) model and TCP/IP. Although the OSI model is often used as the framework for discourse in this area, it is the TCP/IP protocol suite that is the basis for most commercially available interoperable products and that is the focus of Parts Five and Six of this book. 9 CHAPTER DATA COMMUNICATIONS, DATA NETWORKS, AND THE INTERNET 1. 1 1. 2 1. 3 1. 4 1. 5 1. 6 Data Communications and Networking for Todays Enterprise A Communications Model Data Communications Networks The Internet An Example Configuration 1 10 The fundamental problem of communication is that of reproducing at one point either exactly or approximately a message selected at another point. The Mathematical Theory of Communication, Claude Shannon KEY POINTS The scope of this book is broad, covering three general areas data communications, networking, and protocols the first two are introduced in this chapter. Data communications deals with the transmission of levels in a reliable and efficient manner. Topics covered include level transmission, transmission media, signal encoding, interfacing, data link control, and multiplexing. Networking deals with the techno logy and architecture of the communications networks used to interconnect communicating devices. This field is mainly divided into the topics of local area networks (LANs) and wide area networks (WANs). The 1970s and 1980s saw a coalition of the fields of computer science and data communications that profoundly changed the technology, products, and companies of the now combined computer-communications industry. The computercommunications revolution has produced some(prenominal) remarkable facts There is no fundamental difference between data processing (computers) and data communications (transmission and switching equipment). There are no fundamental differences among data, voice, and video communications. The distinction among single-processor computer, multiprocessor computer, local network, metropolitan network, and long-haul network has blurred.One effect of these trends has been a growing overlap of the computer and communications industries, from component fabrication to system integration. Another result is the development of integrated systems that transmit and process all types of data and information. both the technology and the technical standards organizations are driving toward integrated public systems that make virtually all data and information sources around the world easily and uniformly accessible. This book aims to provide a unified view of the broad field of data and computer communications. The organization of the book reflects an attempt to break this massive subject into comprehensible parts and to build, piece by piece, a survey of the state of the art.This introductory chapter begins with a general model of communications. wherefore a brief discussion introduces each of the Parts Two through Four of this book. Chapter 2 provides an overview to Parts Five and Six 11 12 CHAPTER 1 / DATA COMMUNICATIONS, DATA NETWORKS, AND THE INTERNET 1. 1 DATA COMMUNICATIONS AND NETWORKING FOR TODAYS endeavour Effective and efficient data comm unication and networking facilities are spanking to any enterprise. In this section, we first look at trends that are increasing the challenge for the cable manager in planning and managing such facilities. Then we look specifically at the requirement for ever-greater transmission step on its and network talent. TrendsThree different forces have consistently driven the architecture and evolution of data communications and networking facilities avocation growth, development of new services, and advances in technology. Communication traffic, both local (within a building or building complex) and long distance, both voice and data, has been growing at a high and steady rate for decades. The increasing tenseness on office automation, remote access, online transactions, and other productivity measures means that this trend is likely to continue. Thus, managers are eer struggling to maximize ability and minimize transmission costs. As lineagees rely more and more on information t echnology, the range of services expands. This ontogenesiss the demand for high-capacity networking and transmission facilities.In turn, the continuing growth in high-speed network offerings with the continuing drop in prices encourages the expansion of services. Thus, growth in services and growth in traffic capacity go hand in hand. Figure 1. 1 gives some examples of information-based services and the data evaluate needed to support them ELSA02. Finally, trends in technology enable the provision of increasing traffic capacity and the support of a wide range of services. Four technology trends are particularly notable 1. The trend toward windy and cheaper, both in computing and communications, continues. In terms of computing, this means more powerful computers and clusters of computers capable of bread and butter more demanding applications, such as multimedia applications.In terms of communications, the increasing use of optical fiber has brought transmission prices down and greatly ontogenesisd capacity. For example, for long-distance telecommunication and data network links, recent offerings of dense wavelength particle multiplexing (DWDM) enable capacities of many terabits per second. For local area networks (LANs) many enterprises now have Gigabit Ethernet backbone networks and some are beginning to deploy 10-Gbps Ethernet. 2. Both voice-oriented telecommunications networks, such as the public switched telephone network (PSTN), and data networks, including the Internet, are more intelligent than ever. Two areas of intelligence are noteworthy.First, todays networks can offer differing levels of superior of service (QoS), which include specifications for maximum delay, minimum throughput, and so on. Second, todays networks provide a variety of customizable services in the areas of network management and security. 1. 1 / DATA COMMUNICATIONS AND NETWORKING FOR TODAYS try Speed (kbps) Transaction processing Messaging/text apps Voice Location servic es Still hear transfers Internet/VPN access Database access Enhanced Web surfing Low-quality video Hifi audio Large file transfer Moderate video Interactive entertainment High-quality video Performance Poor Adequate Good 9. 6 14. 4 28 64 144 384 2000 13 VPN virtual private network Figure 1. 1 Services versus Throughput Rates 3.The Internet, the Web, and associated applications have e incorporate as dominant features of both the business and ad hominem world, hypothesis up many opportunities and challenges for managers. In addition to exploiting the Internet and the Web to reach customers, suppliers, and partners, enterprises have formed intranets and extranets1 to seize their proprietary information free from unwanted access. 4. There has been a trend toward ever-increasing mobility for decades, liberating workers from the confines of the physical enterprise. Innovations include voice mail, remote data access, pagers, fax, e-mail, cordless phones, cell phones and cellular networ ks, and Internet portals.The result is the ability of employees to take their business context with them as they move about. We are now seeing the growth of high-speed wireless access, which further enhances the ability to use enterprise information resources and services anywhere. 1 Briefly, an intranet uses Internet and Web technology in an isolated facility internal to an enterprise an extranet extends a companys intranet out onto the Internet to allow selected customers, suppliers, and mobile workers to access the companys private data and applications. 14 CHAPTER 1 / DATA COMMUNICATIONS, DATA NETWORKS, AND THE INTERNET Data Transmission and Network Capacity RequirementsMomentous changes in the way organizations do business and process information have been driven by changes in networking technology and at the same time have driven those changes. It is hard to separate chicken and egg in this field. Similarly, the use of the Internet by both businesses and individuals reflects t his cyclic dependency the availability of new image-based services on the Internet (i. e. , the Web) has resulted in an increase in the total number of users and the traffic volume generated by each user. This, in turn, has resulted in a need to increase the speed and efficiency of the Internet. On the other hand, it is only such increased speed that makes the use of Web-based applications palatable to the end user.In this section, we survey some of the end-user factors that fit into this equation. We begin with the need for high-speed LANs in the business environment, because this need has appeared first and has forced the pace of networking development. Then we look at business WAN requirements. Finally we offer a few words about the effect of changes in commercial electronics on network requirements. The Emergence of High-Speed LANs Personal computers and microcomputer workstations began to achieve widespread acceptance in business computing in the early 1980s and have now achiev ed virtually the status of the telephone an essential tool for office workers.Until relatively recently, office LANs provided basic connectivity servicesconnecting personal computers and terminals to mainframes and midrange systems that ran corporate applications, and providing workgroup connectivity at the departmental or divisional level. In both cases, traffic patterns were relatively light, with an emphasis on file transfer and electronic mail. The LANs that were available for this type of workload, primarily Ethernet and token ring, are well suited to this environment. In the 1990s, two significant trends altered the role of the personal computer and therefore the requirements on the LAN 1. The speed and computing power of personal computers continued to enjoy explosive growth. These more powerful platforms support graphics-intensive applications and ever more elaborate graphical user interfaces to the operating system. . MIS (management information systems) organizations have recognized the LAN as a viable and essential computing platform, resulting in the focus on network computing. This trend began with client/server computing, which has become a dominant architecture in the business environment and the more recent Webfocused intranet trend. Both of these approaches involve the frequent transfer of potentially large volumes of data in a transaction-oriented environment. The effect of these trends has been to increase the volume of data to be handled over LANs and, because applications are more interactive, to reduce the acceptable delay on data transfers.The earlier generation of 10-Mbps Ethernets and 16-Mbps token rings was simply not up to the job of documentation these requirements. The following are examples of requirements that call for higher-speed LANs Centralized server farms In many applications, there is a need for user, or client, systems to be able to draw huge amounts of data from multiple centralized servers, called server farms. An exa mple is a color publishing operation, in 1. 1 / DATA COMMUNICATIONS AND NETWORKING FOR TODAYS ENTERPRISE 15 which servers typically contain tens of gigabytes of image data that must be downloaded to imaging workstations. As the performance of the servers themselves has increased, the bottleneck has shifted to the network. Power workgroups These groups typically consist of a small number of cooperating users who need to draw massive data files across the network. Examples are a software development group that runs tests on a new software version, or a computer-aided design (CAD) company that regularly runs simulations of new designs. In such cases, large amounts of data are distributed to several workstations, processed, and updated at very high speed for multiple iterations. High-speed local backbone As processing demand grows, LANs proliferate at a site, and high-speed interconnection is necessary. incarnate Wide Area Networking Needs As recently as the early 1990s, there was an emphasis in many organizations on a centralized data processing model.In a typical environment, there capacity be significant computing facilities at a few regional offices, consisting of mainframes or well-equipped midrange systems. These centralized facilities could handle most corporate applications, including basic finance, accounting, and personnel programs, as well as many of the business-specific applications. Smaller, outlying offices (e. g. , a bank branch) could be equipped with terminals or basic personal computers linked to one of the regional centers in a transaction-oriented environment. This model began to change in the early 1990s, and the change accelerated through the mid-1990s. Many organizations have dispersed their employees into multiple smaller offices.There is a growing use of telecommuting. Most significant, the nature of the application structure has changed. First client/server computing and, more recently, intranet computing have fundamentally restructur ed the organizational data processing environment. There is now much more reliance on personal computers, workstations, and servers and much less use of centralized mainframe and midrange systems. Furthermore, the virtually universal deployment of graphical user interfaces to the desktop enables the end user to exploit graphic applications, multimedia, and other data-intensive applications. In addition, most organizations require access to the Internet.When a few clicks of the cringe can trigger huge volumes of data, traffic patterns have become more unpredictable while the number load has risen. All of these trends means that more data must be transported off premises and into the wide area. It has long been accepted that in the typical business environment, about 80% of the traffic remains local and about 20% traverses wide area links. But this rule no longer applies to most companies, with a greater percentage of the traffic going into the WAN environment COHE96. This traffic f low shift places a greater burden on LAN backbones and, of course, on the WAN facilities used by a corporation.Thus, unspoilt as in the local area, changes in corporate data traffic patterns are driving the universe of discourse of high-speed WANs. Digital Electronics The rapid conversion of consumer electronics to digital technology is having an impact on both the Internet and corporate intranets. As these new gadgets come into view and proliferate, they dramatically increase the amount of image and video traffic carried by networks. Two noteworthy examples of this trend are digital versatile disks (DVDs) and digital still cameras. With the capacious DVD, the electronics industry has at last 16 CHAPTER 1 / DATA COMMUNICATIONS, DATA NETWORKS, AND THE INTERNET found an acceptable replacement for the analog VHS videotape.The DVD has replaced the videotape used in videocassette recorders (VCRs) and replaced the CD-ROM in personal computers and servers. The DVD takes video into the di gital age. It delivers movies with picture quality that outshines laser disks, and it can be randomly accessed like audio CDs, which DVD machines can also play. Vast volumes of data can be crammed onto the disk, currently seven times as much as a CDROM. With DVDs huge storage capacity and vivid quality, PC games have become more realistic and educational software incorporates more video. interest in the wake of these developments is a new crest of traffic over the Internet and corporate intranets, as this material is incorporated into Web sites. A related product development is the digital camcorder.This product has made it easier for individuals and companies to make digital video files to be placed on corporate and Internet Web sites, again adding to the traffic burden. 1. 2 A COMMUNICATIONS pretense This section introduces a simple model of communications, illustrated by the block diagram in Figure 1. 2a. The fundamental purpose of a communications system is the exchange of dat a between two parties. Figure 1. 2b presents one particular example, which is communication between a workstation and a server over a public telephone network. Another example is the exchange of voice signals between two telephones over the same network. The key elements of the model are as follows Source.This device generates the data to be transmissible examples are telephones and personal computers. Source system Destination system Source Transmitter Transmission System (a) General block diagram Receiver Destination Workstation Modem Public telephone network (b) Example Modem Server Figure 1. 2 Simplified Communications Model 1. 2 / A COMMUNICATIONS MODEL 17 Transmitter Usually, the data generated by a source system are not transmitted directly in the form in which they were generated. Rather, a transmitter transforms and encodes the information in such a way as to produce electromagnetic signals that can be transmitted across some assortment of transmission system.For exampl e, a modem takes a digital bit stream from an attached device such as a personal computer and transforms that bit stream into an analog signal that can be handled by the telephone network. Transmission system This can be a single transmission line or a complex network connecting source and destination. Receiver The receiver accepts the signal from the transmission system and converts it into a form that can be handled by the destination device. For example, a modem will accept an analog signal coming from a network or transmission line and convert it into a digital bit stream. Destination Takes the incoming data from the receiver.This simple narrative conceals a wealth of technical complexity. To get some idea of the scope of this complexity, Table 1. 1 lists some of the key tasks that must be performed in a data communications system. The list is somewhat arbitrary Elements could be added items on the list could be merged and some items represent several tasks that are performed at different levels of the system. However, the list as it stands is suggestive of the scope of this book. The first item, transmission system utilization, refers to the need to make efficient use of transmission facilities that are typically shared among a number of communicating devices.Various techniques (referred to as multiplexing) are used to allocate the total capacity of a transmission medium among a number of users. Congestion control techniques may be required to assure that the system is not overwhelmed by excessive demand for transmission services. To communicate, a device must interface with the transmission system. All the forms of communication discussed in this book depend on the use of electromagnetic signals propagated over a transmission medium. Thus, once an interface is established, signal generation is required for communication. The properties of the signal, such as form and intensity, must be such that the signal is (1) capable of being propagated through th e transmission system, and (2) explicable as data at the receiver.Not only must the signals be generated to conform to the requirements of the transmission system and receiver, but also there must be some form of synchronization Table 1. 1 Communications Tasks Transmission system utilization Interfacing Signal generation Synchronization Exchange management Error undercover work and correction Flow control Addressing Routing Recovery Message formatting Security Network management 18 CHAPTER 1 / DATA COMMUNICATIONS, DATA NETWORKS, AND THE INTERNET between transmitter and receiver. The receiver must be able to determine when a signal begins to arrive and when it ends. It must also know the duration of each signal element.Beyond the basic matter of deciding on the nature and timing of signals, there is a variety of requirements for communication between two parties that might be collected under the term exchange management. If data are to be exchanged in both directions over a period of time, the two parties must cooperate. For example, for two parties to engage in a telephone conversation, one party must dial the number of the other, create signals to be generated that result in the ringing of the called phone. The called party completes a connection by lifting the receiver. For data processing devices, more will be needed than simply establishing a connection certain conventions must be decided on.These conventions may include whether both devices may transmit simultaneously or must take turns, the amount of data to be sent at one time, the format of the data, and what to do if certain contingencies such as an error arise. The next two items might have been included under exchange managem