Data and Computer Communications

entropy AND COMPUTER COMMUNICATIONS one(a)-one-eighth Edition William Stallings expediteing turn on River, untried Jersey 07458 Library of sexual congress Cataloging-in-Publication entropy on File Vice President and Editorial theater director, ECS Marcia J. Horton executive Editor Tracy Dunkelberger Assistant Editor Carole Snyder Editorial Assistant Christianna lee(prenominal) executive director Managing Editor Vince OBrien Managing Editor Camille Trentacoste Production Editor Rose Kernan Director of Creative military service Paul Belfanti Creative Director Juan Lopez Cover interior foundationer Bruce Kenselaar Managing Editor,AV Management and Production Patricia Burns 2007 Pearson direction, Inc.Pearson learner Hall Pearson Education, Inc. Upper Saddle River, NJ 07458 Art Editor Gregory Dulles Director, Image resourcefulness sharpen Melinda Reo Manager, Rights and Permissions Zina Arabia Manager,Visual look for Beth Brenzel Manager, Cover Visual Research and Perm issions K arn Sanatar Manufacturing Manager, ESM Alexis Heydt-Long Manufacturing Buyer Lisa McDo well(p) executive director Marketing Manager Robin OBrien Marketing Assistant macintosh Patterson All rights reserved. No get out the ground of this harbour whitethorn be reproduced in all form or by any means, without permission in compose from the publisher.Pearson Prentice Hall is a trademark of Pearson Education, Inc. All dependable about spic-and-span(prenominal) tradmarks or carrefour names ar the property of their respective owners. The origin and publisher of this take for stool uptaked their best efforts in preparing this prevail. These efforts accommodate the discipline, look, and testing of the theories and programs to determine their issueiveness. 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Pearson Education, Inc. , Upper Saddle River, natural Jersey For my scintillating wife ATS sack up SITE FOR entropy AND COMPUTER COMMUNICATIONS, EIGHTH EDITION The nett billet at WilliamStallings. com/DCC/DCC8e. hyper textbook markup language provides yield for acquireers and disciples employ the concur. It includes the pursuance elements. Course Support Materials The ancestry substructure materials include Copies of figures fro m the prevail in PDF format A precise aline of course notes in PDF format suitable for student payout or for use as viewgraphs A treated of PowerPoint slides for use as chew out aids info moveing carcass Science Student Support Site contains a number of consorts and documents that the student may find useful in his/her ongoing electronic selective information outgrowthor lore education.The site includes a go off of elemental, pertinent mathematicsematics advice on research, writing, and doing homework problems links to computer acquirement research resources, much(prenominal) as report repositories and bibliographies and polar useful links. An errata sheet for the set aside, updated at around monthly T DCC Courses The DCC8e electronic ne 2rk site includes links to vane sites for courses taught using the book. These sites squirt provide useful ideas about scheduling and outcome ordering, as well as a number of useful handouts and another(prenominal) materials. Useful wind vane Sites The DCC8e weave site includes links to relevant entanglement sites, organized by chapter.The links cover a long spectrum of topics and entrust enable students to explore timely issues in greater erudition. iv WEB SITE FOR DATA AND COMPUTER COMMUNICATIONS, EIGHTH EDITION v secondary Documents The DCC8e Web site includes a number of documents that expand on the intervention in the book. Topics include standards organizations, Sockets, transmittance control communication theory protocol/IP checksum, ASCII, and the sampling theorem. profit send out List An profit mailing disceptation is maintained so that t distributively(prenominal)ers using this book batch turn discipline, suggestions, and questions with each(prenominal) other and the author.Subscription information is provided at the books Web site. Simulation and feigning Tools The Web site includes links to the cnet Web site and the patterning tools Web site. These packages go off be use to analyze and experiment with protocol and web design issues. distri just immediatelyively site includes down make fullable softw atomic number 18 and background information. The instructors manual includes much than(prenominal) information on loading and using the softwargon and suggested student projects. This varlet deliberately left blank CONTENTS Web Site for info and electronic computer communication theory Preface xv 1 iv Chapter 0 Readers and Instructors Guide 0. Outline of the sacred scripture 2 0. 2 Roadmap 3 0. 3 earnings and Web Resources 5 0. 4 Standards 6 PART ONE OVERVIEW 9 Chapter 1 info Communications, Data interneting, and the earnings 10 1. 1 Data Communications and Net workings for instantlys Enterprise 12 1. 2 A Communications Model 16 1. 3 Data Communications 19 1. 4 earningss 22 1. 5 The lucre 25 1. 6 An Example Configuration 29 Chapter 2 protocol computer architecture, transmission control protocol/IP, and mesh-Based Applicati ons 2. 1 The Need for a Protocol computer architecture 33 2. 2 The transmission control protocol/IP Protocol architecture 34 2. 3 The OSI Model 42 2. 4 Standardization indoors a Protocol Architecture 44 2. Traditional net profit-Based Applications 48 2. 6 Multimedia 48 2. 7 Recommended rendition and Web Sites 53 2. 8 depict Terms, canvas Questions, and Problems 54 appendage 2A The Trivial File budge Protocol 57 PART TWO DATA COMMUNICATIONS 62 Chapter 3 Data infection 65 3. 1 Concepts and Terminology 67 3. 2 analogue and Digital Data Transmission 78 3. 3 Transmission Impairments 86 3. 4 Channel Capacity 91 3. 5 Recommended course session and Web Site 96 3. 6 backbone Terms, check over Questions, and Problems auxiliary 3A Decibels and presage Strength 99 Chapter 4 Transmission Media 102 4. channelise Transmission Media 104 4. 2 Wireless Transmission 117 4. 3 Wireless filename extension 125 32 96 vii viii CONTENTS 4. 4 4. 5 4. 6 Line-of-Sight Transmission 129 Recommende d Reading and Web Sites 133 attain Terms, brushup 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 168 5. 5 Recommended Reading 175 5. 6 Key Terms, reappraisal Questions, and Problems 175 Chapter 6 Digital Data Communication Techniques 180 6. asynchronous and synchronised 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, revue Questions, and Problems 204 Chapter 7 Data tie beam go for Protocols 207 7. 1 Flow break 209 7. 2 Error Control 216 7. 3 superior Data Link Control (HDLC) 222 7. 4 Recommended Reading 228 7. 5 Key Terms, round off Questions, and Problems 229 addendum 7A consummation Issues 232 Chapter 8 Multiplexing 239 8. 1 Frequency-Division Multiplexing 242 8. 2 Synchronous Time-Div ision 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, check Questions, and Problems 270 Chapter 9 spread head Spectrum 274 9. 1 The Concept of Spread Spectrum 276 9. 2 Frequency Hopping Spread Spectrum 277 9. 3 Direct Sequence Spread Spectrum 282 9. 4 Code-Division Multiple gate 287 9. 5 Recommended Reading and Web Site 290 9. 6 Key Terms, polish Questions, and Problems 291 CONTENTS ix PART THREE WIDE AREA NETWORKS 295 Chapter 10 rotary 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 Frame Relay 319 10. 8 Recommended Reading and Web Sites 324 10. 9 Key Terms, Review Questions, and Problems 325 Chapter 11 Asynchronous permute Mode 328 11. 1 Protocol Archit ecture 329 11. 2 automated teller machine sensible Connections 331 11. 3 atmospheric state Cells 335 11. 4 Transmission of asynchronous reposition mode 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 Networks 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 over-crowding 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 Wireless Networks 413 14. 1 Principles of Cellula r Networks 415 14. 2 First Generation Analog 427 14. 3 number Generation CDMA 429 14. 4 Third Generation formations 437 14. 5 Recommended Reading and Web Sites 440 14. 6 Key Terms, Review Questions, and Problems 441 387 x CONTENTS PART quadruplet LOCAL AREA NETWORKS 444 Chapter 15 local anaesthetic state Network Overview 446 15. 1 Background 448 15. 2 Topologies and Transmission Media 451 15. 3 local bea network 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 Emergence of High-Speed LANs 483 16. 2 Ethernet 485 16. 3 fiber Channel 500 16. 4 Recommended Reading and Web Sites 504 16. 5 Key Terms, Review Questions, and Problems 506 supplement 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 T echnology 528 17. 3 IEEE 802. 11 Architecture and Services 531 17. 4 IEEE 802. 11 Medium Access Control 535 17. 5 IEEE 802. 1Physical Layer 543 17. 6 IEEE 802. 11 protection Considerations 549 Recommended Reading and Web Sites 550 17. 7 17. 8 Key Terms, Review Questions, and Problems 551 PART FIVE mesh AND TRANSPORT PROTOCOLS Chapter 18 earningswork Protocols 556 18. 1 elementary Protocol Functions 558 18. 2 Principles of Internetworking 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 prosody 646 Recommended Reading and Web Sites 649 Key Terms, Review Que stions, and Problems 651 657 Chapter 20 manoeuvre Protocols 655 20. 1 Connection-Oriented Transport Protocol Mechanisms 20. 2 transmission control protocol 674 20. 3 transmission control protocol 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 Chapter 21 21. 1 21. 2 21. 3 21. 4 21. 5 21. 6 21. 7 21. 8 21. profit APPLICATIONS 699 Network Security 701 Security Requirements and Attacks 703 Confidentiality with Conventional Encryption 705 Message Authentication and haschisch Functions 713 Public-Key Encryption and Digital Signatures 720 Secure Socket Layer and Transport Layer Security 727 IPv4 and IPv6 Security 732 Wi-Fi protected 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 ApplicationsMultimedia 799 24. 1 audio recording and Video Compression 800 24. 2 real time Traffic 808 24. 3 illustration 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 quaternaryier Analysis 835 A. 1 Fourier Series Representation of Periodic Signals 836 A. 2 Fourier Transform Representation of nonoscillatory Signals 837 A. 3 Recommended Reading 840 Appendix B Projects for Teaching Data and Computer Communications B. 1 Practical Exercises 842 B. 2 Sockets Projects 843 B. 3 E at th at placeal 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 password Topics 846 References Index 858 ONLINE APPENDICES WilliamStallings. om/DCC Appendix C Sockets A Programmers portal C. 1 Versions of Sockets C. 2 Sockets, 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 shapings 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 try out 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 long dozen Appendix I Queu ing 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 transmission control protocol/IP Checksum K. 1 Ones-Complement Addition K. 2 Use in transmission control protocol and IP Appendix L TCP/IP Example Appendix M logical Resource Locators (URLs) and Uniform Resource Identifiers (URIs) M. 1 Uniform Resource Locator M. 2 Uniform Resource Identifier M. 3 To describe More Appendix N Glossary Augmented Backus-Naur FormThis rascal intentionally left blank PREFACE Begin at the start-off 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 subject scene of action of information and computer communication theory. The organization of the book reflects an attempt to break this enormous subject into explicable split and to build, piece by piece, a survey o f the state of the art. The book emphasizes underlying principles and topics of fundamental importance concerning the technology and architecture of this field and provides a comminuted raillery of leading-edge topics.The following grassroots themes serve to unify the discussion Principles Although the scope of this book is broad, there be a number of base principles that appear repeatedly as themes and that unify this field. Examples ar threefoldxing, flow control, and misapprehension control. The book naughtylights these principles and contrasts their application in grouchyised aras of technology. Design approaches The book examines alternating(a) approaches to meeting specific communication requirements. Standards Standards have come to assume an more and more distinguished, indeed dominant, role in this field.An understanding of the on-going status and in store(predicate) direction of technology requires a comprehensive discussion of the associate standards . think AUDIENCE The book is intended for twain an academic and a superior audience. For the professional liaisoned in this field, the book serves as a basic reference volume and is suitable for self-study. As a textbook, it can be utilize for a one-semester or two-semester course. It covers the material in Networking (NET), a core out ara in the development Technology body of knowledge, which is part of the picture ACM/IEEE/AIS Computing Curricula 2005.The book also covers the material in Computer Networks (CE-NWK), a core argona in Computer Engineering 2004 Curriculum Guidelines from the ACM/IEEE marijuana cigarette Task Force on Computing Curricula. PLAN OF THE TEXT The book is divided into six parts (see Chapter 0) Overview Data Communications Wide or pussal cavity Networks xv xvi PREFACE Local field of operation Networks Internet and Transport Protocols Internet Applications In findory, the book includes an extensive glossary, a list of ofttimes used acrony ms, and a bibliography. Each chapter includes problems and suggestions for further discipline.The chapters and parts of the book are sufficiently modular to provide a great push-down store of tractability in the design of courses. See Chapter 0 for a number of little suggestions for twain top-down and bottom-up course strategies. INSTRUCTIONAL SUPPORT MATERIALS To view as instructors, the following materials are provided Solutions manual Solutions to all end-of-chapter Review Questions and Problems. PowerPoint Slides A band of slides applications programme all chapters, suitable for use in lecturing. PDF files 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 advance to these materials. In addition, the books Web site congests instructors with connect to Webs sites for other courses bei ngness taught using this book Sign up information for an Internet mailing list for instructors lucre SERVICES FOR teacherS AND STUDENTS There is a Web site for this book that provides contri howevere 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 page is at WilliamStallings. com/DCC/DCC8e. html see the section, Web Site for Data and Computer Communications, preceding the Table of Contents, for more information. An Internet mailing list has been set up so that instructors using this book can diversify information, suggestions, and questions with each other and with the author. As soon as typos or other errors are discover, an errata list for this book give be available at WilliamStallings. om. PROJECTS AND other(a) STUDENT EXERCISES For many instructors, an important component of a data communications 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 dose in time of resist for including a projects component in the course. The instructors accompanimentation not only includes guidance on how to assign and structure the projects but also includes a set of Users PREFACE 17 Manuals for various project types enlarge specific assignments, all written particularly for this book.Instructors can assign work in the following areas Practical exercises victimization network commands, the student gains experience in network connectivity. Sockets programing 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 st udents to study the behavior of protocols. Simulation projects The student can use the simulation package cnet to analyze network behavior. Performance modeling projects ii 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 knowledge and writing a report, plus suggested assignment wording. Writing assignments The instructors supplement includes a list of writing assignments to facilitate learning the material. Discussion topics These topics can be used in a classroom, chat room, or contentedness board surround 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 va ried learning experience and to tailor a course plan to meet the specific needs of the instructor and students. See Appendix B for details.WHATS NEW IN THE EIGHTH EDITION This eighth edition is seeing the light of day less than four long time after the publication of the seventh edition. During that time, the pace of change in this field continues unabated. In this new edition, I try to capture these changes while maintaining a broad and comprehensive coverage of the entire field. To bring down the process of revision, 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 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 exploiter friendliness, there have been major substantive changes without the book. Every chapter has been revised, new chapters h ave been added, and the overall organization of the book has changed. Highlights include Updated coverage of Giga raciness Ethernet and 10-Gbps Ethernet New details of these standards are provided. Updated coverage of WiFi/IEEE 802. 11 wireless LANs IEEE 802. 11 and the related WiFi specifications have continued to evolve. viii PREFACE New coverage of IP performance metrics and service level agreements (SLAs) These aspects of forest of Service (QoS) and performance monitoring are change magnitudely important. Address upshot Protocol (ARP) This important protocol is now covered. New coverage of TCP Tahoe, Reno, and NewReno These congestion control algorithms are now common in around commercial implementations. Expanded coverage of security 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 earlier 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 manakin of TCP/IP operation, and the BNF grammar.In addition, throughout the book, virtually every topic has been updated 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 peck, who gave generously of their time and expertise. The following people reviewed all or a large 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 Roohaprv ar (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 expert 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 Rick Jones. In addition, Larry Owens of California State University and Katia Obraczka of the University of grey California provided about homework problems.Thanks also to the following contributors. Zornitza Prodanoff of the University of North Florida fain the appendix on Sockets programming. Michael Harris of the University of southwestern Florida is trustworthy 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. in the end, I would bid to thank the many people responsible for the publication of the book, all of whom did their usual ex cadreent job.This includes the staff at Prentice Hall, particularly my editor Tracy Dunkelberger, her assistants Christianna Lee and Carole Snyder, and production manager Rose Kernan. Also, Patricia M. Daly did the retroflex editing. CHAPTER READERS AND INSTRUCTORS GUIDE 0. 1 0. 2 0. 3 0. 4 Outline of the account book Roadmap Internet and Web Resources Standards 0 1 2 CHAPTER 0 / READERS AND INSTRUCTORS GUIDE In the meanwhile, then, demanded Li-loe, relate to me the story to which reference has been made, thereby proving the faithfulness of your assertion, and at the same time affording n entertainment of a about exceptional kind. The shadows lengthen, replied Kai Lung, but as the narrative in question is of an inconspicuous span I will raise no barrier against your praise request, especially as it indicates an awakening taste hitherto unexpected. Kai Lungs prospering Hours, Earnest Bramah This book, with its accompanying Web sit e, covers a lot of material. Here we break up the ratifier some basic background information. 0. 1 OUTLINE OF THE earmark The book is organized into five parts take off One. Overview Provides an introduction to the station 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. start devil. Data Communications Concerned primarily with the exchange of data amidst two directly connected devices. Within this restricted scope, the key aspects of transmission, interfacing, link control, and multiplexing are examined. per centum deuce-ace. Wide Area Networks Examines the internal mechanisms and user-network interfaces that have been developed to support voice, data, and multimedia communications over long-distance networks.The traditional technologies of packet change by reversal and circuit switching are examined, as well as the more recent ATM and wireless WANs . Separate chapters are devoted to routing and congestion control issues that are relevant both to switched data networks and to the Internet. subprogram Four. Local Area Networks Explores the technologies and architectures that have been developed for networking over shorter distances. The transmission media, topologies, and medium approach shot control protocols that are the key ingredients of a LAN design are explored and specific standardized LAN arrangements examined. bankrupt basketball team. Networking Protocols Explores both the architectural principles and the mechanisms required for the exchange of data among computers, workstations, servers, and other data touch on devices. Much of the material in this part relates to the TCP/IP protocol suite. Part Six. Internet Applications Looks at a value of applications that operate over the Internet. A more detailed, chapter-by-chapter compend of each part appears at the beginning of that part. 0. 2 / ROADMAP 3 0. 2 ROADMAP C ourse 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 trio diverse course designs Fundamentals of Data Communications split One (overview) and ii (data communications) and Chapters 10 and 11 (circuit switching, packet switching, and ATM). Communications Networks If the student has a basic background in data communications, then this course could cover Parts One (overview), Three (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 vanadium (protocols), and part or all of Part Six (applications). In addition, a mor e streamlined course that covers the entire book is realistic by eliminating certain chapters that are not intrinsic 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. symbol 0. 1a shows the bottom-up approach provided by reading the book from front to back. With this approach, each part builds on the material in the previous part, so that it is al authoritys clear how a given tier of functionality is supported from below. There is more material than can be advantageously covered in a single semester, but the books organi zation makes it easy to eliminate some chapters and maintain the bottom-up sequence. word form 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 forms. This has the advantage of immediately focusing on the close to visible part of the material, the applications, and then seeing, progressively, how each layer is supported by the side by side(p) layer down. frame 0. 1c is an example of a comprehensive treatment and identification number 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 S ix Internet Applications Part Five TCP/IP Part Three WANs Part Four LANs Part Two Data Communications (c) A top-down approach (d) Another top-down approach (b) Another 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 select chapters to reflect specific training 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 (In ternet 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 keep 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 legion(predicate) math sites How-to Advice and guidance for solving homework problems, writing adept reports, and preparing technical presentations Research resources Links to important collections of papers, technical reports, and bibliographies Miscellaneous A miscellany of useful documents and links otherwise Web Sites There are legion(predicate) 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 Recommen ded Reading and Web Sites section. Because the addresses for Web sites tend to change frequently, I have not include 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. Includes 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 hardware and software product vendors who before long have Web sites, as well as a list of thousands of computer and networking companies in a phone directory. IEEE Communications Society near(a) way to k eep up on conferences, publications, and so on. ACM Special amour Group on Communications (SIGCOMM) Good way to keep up on conferences, publications, and so on. International Telecommunications 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 Lot of useful articles, tutorials, and product information. A bit hard to navigate, but worthwhile. USENET News collections 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-signal ratio, but it is worth experimenting to see if any meet your needs. The nearly relevant are as follows comp. dcom. lans, comp. dcom. lans. misc common 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 telecommunications manufacturing 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 generally interface to and communicate with other vendors equipment, computer vendors have traditio nally attempted to monopolize their customers. The proliferation of computers and distributed processing has made that an untenable position.Computers from different vendors moldiness communicate with each other and, with the ongoing organic evolution of protocol standards, customers will no longer accept special-purpose protocol rebirth 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 approximately striking ones. The principal advantages of standards are as follows A standard masters that there will be a large market for a particular piece of equipment or software. This encourages mass production and, in some cases, the use of large-scale-integration (LSI) or very-large-scale-integration (VLSI) techniques, resulting in lower costs. A standard allows products from multiple vendors to communicate, openhanded t he 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 efficacious 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 still areas where multiple contrast standards exist.Throughout this book, we describe the most important standards in use or being developed for various aspects of data and computer communications. Various organizations have been bear on in the development or promotion of these standards. The following are the most important (in the current stage setting) of these organizations Internet Society The Internet SOCiety (ISOC) is a professi onal membership society with more than 150 organizational and 6000 individual members in over 100 countries. It provides leadership in addressing issues that confront the futurity 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 charge develops local area network standards and metropolitan area network standards. The most widely 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 planetary organization within the United Nations System where govern ments and the private sector orchestrate global telecom networks and function.The ITU Telecommunication Standardization Sector (ITU-T) is one of the deuce-ace sectors of the ITU. ITU-Ts mission is the production of standards covering all fields of telecommunications. ATM Forum The ATM Forum is an international nonprofit organization create with the objective of accelerating the use of ATM (asynchronous transfer of training mode) products and function through a rapid convergence of interoperability specifications. In addition, the Forum promotes industry cooperation and awareness. ISO The International Organization for Standardization (ISO)1 is a worldwide federation of national standards bodies from more than cxl 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, importee 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 protocols 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 handsome 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 a great deal 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 fun damental 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 signals in a reliable and efficient manner. Topics covered include signal transmission, transmission media, signal encoding, interfacing, data link control, and multiplexing. Networking deals with the technology and architecture of the communications networks used to interconnect communicating devices. This field is generally divided into the topics of local area networks (LANs) and wide area networks (WANs). The seventies and 1980s saw a merger 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 reduces has been a suppuration overlap of the computer and communications industries, from component equivocation to system integration. Another result is the development of integrated systems that transmit and process all types of data and information. some(prenominal) the technology and the technical standards organizations are driving force toward integrated public systems that make virtually all data and information sources around the world easily and uniformly accessi ble. 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. Then 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 instantlyS ENTERPRISE impelling and efficient data communication and networking facilities are vital to any enterprise. In this section, we first look at trends that are increasing the challenge for the assembly line manager in planning and managing such facilities. Then we look specifically at the requirement for ever-greater transmission promotes and network capacity. TrendsThree different for ces have systematically driven the architecture and evolution of data communications and networking facilities merchandise growth, development of new services, and advances in technology. Communication traffic, both local (within a mental synthesis 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 apt(predicate) to continue. Thus, managers are constantly struggling to maximize capacity and minimize transmission costs. As disdaines rely more and more on information technology, the range of services expands. This increases 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 cap acity go hand in hand. Figure 1. 1 gives some examples of information-based services and the data range 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 faster and cheaper, both in reason and communications, continues. In basis of computing, this means more mogulily computers and clusters of computers exposed of supporting more demanding applications, such as multimedia applications.In terms of communications, the increasing use of optical fiber has brought transmission prices down and greatly increased capacity. For example, for long-distance telecommunication and data network links, recent offerings of thickheaded wavelength division multiplexing (DWDM) enable capacities of many terabits per second. For local area networks (LANs) many enterprises now have Gigabit Ethernet backbone networks and some a re beginning to deploy 10-Gbps Ethernet. 2. Both voice-oriented telecommunications networks, such as the public switched mobilise 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 quality of service (QoS), which include specifications for maximum delay, stripped 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 ENTERPRISE Speed (kbps) Transaction processing Messaging/text apps Voice Location services Still image transfers Internet/VPN access Database access Enhanced Web surfing Low-quality video Hifi audio big(p) 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 Thro ughput Rates 3.The Internet, the Web, and associated applications have emerged as dominant features of both the railway line and ad hominem world, opening 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 isolate their copyrighted information free from unwanted access. 4. There has been a trend toward ever-increasing mobility for decades, liberating workers from the curb of the physical enterprise. Innovations include voice mail, remote data access, pagers, fax, e-mail, cordless phones, cell phones and cellular networks, 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 a nd Web technology in an isolated instalment 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 volaille and egg in this field. Similarly, the use of the Internet by both businesses and individuals reflects this cyclical 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 squeeze 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 achieved virtually the status of the holler an essential tool for office workers.Until relatively recently, office LANs provided basic connectivity servicesconnecting individualised computers and terminals to mainframes and midrange systems that ran collective 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 keepsake 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 originator 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 lymph gland/server computing, which has become a dominant architecture in the business environment and the more recent Webfocused intranet trend. Both of these ap proaches 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 extendd over LANs and, because applications are more interactive, to slenderize the acceptable delay on data transfers.The earlier generation of 10-Mbps Ethernets and 16-Mbps token rings was entirely not up to the job of supporting 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 thickening, systems to be able to draw colossal make outs of data from multiple centralized servers, called server farms. An example is a glossiness publishing operation, in 1. 1 / DATA COMMUNICATIONS AND NETWORKING FOR TODAYS ENTERPRISE 15 which servers typically contain tens of gigabytes of image data that moldiness be downloaded to imaging workstations. As the performance of the servers thems elves 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. Corporate 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 might 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 restructured the organizational data processing environment. There is now much more corporate trust 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 mouse can trigger huge volumes of data, traffic patterns have become more unpredictable while the average 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 flow shift places a greater burden on LAN backbones and, of course, on the WAN facilities used by a corporation.Thus, just as in the local area, changes in corporate data traffic patterns are driving the creation of high-speed WANs. Digital Electronics The rap id alteration 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 digital 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 natural quality, PC games have become more realistic and educational software incorporates more video. Following in the wake of these developments is a new point of traffic over the Internet and corporate intranets, as this material is merged 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 sit around 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 data 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 t he model are as follows Source.This device generates the data to be transmitted examples are telephones and personal computers. Source system speech system Source transmitter Transmission System (a) General block diagram Receiver name and address 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 sort of transmission system.For example, 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 so urce 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 the transmission system, and (2) interpretable 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 synchronising Table 1. 1 Communications Tasks Transmission system u tilization Interfacing Signal generation Synchronization Exchange management Error detection and subject 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 quantify 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 design 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, causing 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