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Business data communications 5th ed

Business data communications 5th ed

자료유형
단행본
개인저자
서명 / 저자사항
Business data communications / David A. Stamper.
판사항
5th ed.
발행사항
Reading, Mass. : Addison-Wesley, c1999.
형태사항
xxviii, 620 p. : ill. (some col.) ; 26 cm.
ISBN
0805377328
일반주기
Includes index.
일반주제명
Data transmission systems. Business enterprises -- Computer networks.
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010 ▼a 98007257
015 ▼a GB98-84648
020 ▼a 0805377328
040 ▼a DLC ▼c DLC ▼d UKM ▼d 211009
049 1 ▼l 121068157 ▼f 과학
050 0 0 ▼a TK5105 ▼b .S734 1999
082 0 0 ▼a 004.6 ▼2 21
090 ▼a 004.6 ▼b S783b5
100 1 ▼a Stamper, David A.
245 1 0 ▼a Business data communications / ▼c David A. Stamper.
250 ▼a 5th ed.
260 ▼a Reading, Mass. : ▼b Addison-Wesley, ▼c c1999.
300 ▼a xxviii, 620 p. : ▼b ill. (some col.) ; ▼c 26 cm.
500 ▼a Includes index.
650 0 ▼a Data transmission systems.
650 0 ▼a Business enterprises ▼x Computer networks.

소장정보

No. 소장처 청구기호 등록번호 도서상태 반납예정일 예약 서비스
No. 1 소장처 과학도서관/Sci-Info(2층서고)/ 청구기호 004.6 S783b5 등록번호 121068157 도서상태 대출가능 반납예정일 예약 서비스 B M

컨텐츠정보

저자소개

David A. Stamper(지은이)

정보제공 : Aladin

목차


CONTENTS

Preface = xxv

Chapter 1 Introduction to Data Communication = 1

 CHAPTER OBJECTIVES = 1

 HISTORY OF THE TELECOMMUNICATION INDUSTRY = 2

 HISTORY OF DATA COMMUNICATION = 4

  The Transistor = 4

  The hush-a-Phone Case = 4

  Competition for Long-Distance Transmission = 6

  The Carterphone Case = 6

  Local Area Networks = 6

  Data Link Protocols = 7

  Microcomputers = 7

  The Internet = 8

  The Telecommunications Act of 1996 = 8

 ESSENTIAL FEATURES OF COMMUNICATION = 8

  Message = 9

  Sender = 10

  Receiver = 10

  Medium = 11

  Understandability = 11

  Error Detection = 11

 DATA COMMUNICATION APPLICATIONS = 11

  Batch Applications = 12

  Data Entry Applications = 12

  Distributed Applications = 12

  Inquiry/Response Applications = 12

  Interactive Applications = 13

  Sensor-Based Applications = 13

  Combined Applications = 13

 REQUIREMENTS OF AN ONLINE SYSTEM = 13

  Performance = 14

  Consistency = 15

  Flexibility = 15

  Availability = 15

  Reliability = 16

  Recovery = 16

  Security = 16

 INTRODUCTION TO NETWORKS = 17

  Computer Networks = 17

  Data Communication Applications and Configurations = 18

  Company A = 18

  Company B = 19

  Company C = 20

  Company D = 21

  System Complexity = 22

  Hierarchy of Functions = 24

  The Functions of Communication = 25

  Functions of OSI Layers = 27

  OSI Reference Model Example = 28

 THE SOFTWARE ENVIRONMENT = 31

  Application Programs = 33

  Operating System = 33

  Data Communication = 33

  Database Management System = 34

  Transaction Processing = 34

  CASE STUDY = 36

 SUMMARY = 37

  KEY TERMS = 37

  REVIEW QUESTIONS = 38

  PROBLEMS AND EXERCISES = 38

Chapter 2 Physical Aspects of Data Communication : Media = 41

 CHAPTER OBJECTIVES = 41

 CONDUCTED MEDIA = 42

  Wires = 42

  Private Versus Public Lines = 42

  Transmission Speed and Frequency Range = 42

  Cable Cost, Gauge, and Types = 43

  Switched Connections Versus Leased Lines = 43

  Twisted-Pair Wires = 45

  Coaxial Cable = 49

  Technology = 49

  Advantages and Disadvantages = 50

  Fiber Optic Cable = 51

  Technology = 51

  Benefits and Cost = 52

 RADIATED MEDIA = 53

  Broadcast Radio = 53

  Microwave Radio = 54

  Technology = 54

  Advantages and Disadvantages = 54

  Satellite Radio = 55

  Technology = 57

  Propagation Delay = 57

  Satellite Providers = 59

  Spread-Spectrum Radio = 59

  Infrared Transmission = 60

  Radiated Media Frequencies = 60

 MEDIA SELECTION CRITERIA = 60

  Cost = 61

  Speed = 61

  Response Time = 61

  Aggregate Data Rate = 62

  Availability = 62

  Expandability = 63

  Error Rates = 64

  Security = 65

  Distance = 65

  Environment = 66

  Application = 66

  Maintenance = 66

 SIGNAL REPRESENTATION AND MODULATION = 67

  Bit Rates, Baud Rates, and Bandwidth = 67

  Digital Versus Analog Representation = 68

  Carrier Signals = 69

  Amplitude Modulation = 70

  Frequency Modulation = 70

  Phase Modulation = 71

  Modems and Their Capabilities = 72

  Cost = 76

  Short-Haul Modems = 77

  Modem Eliminators = 77

  CSU/DSU = 78

  Fiber Optic Modems = 78

  Switched Digital Lines = 78

  CASE STUDY = 79

 SUMMARY = 81

  KEY TERMS = 81

  REVIEW QUESTIONS = 82

  PROBLEMS AND EXERCISES = 82

Chapter 3 Physical Aspects of Data Communication : Data Transmission = 85

 CHAPTER OBJECTIVES = 85

 DATA FLOW = 82

  Simplex Trans mission = 86

  Half-Duplex Transmission = 87

  Full-Duplex Transmission = 87

 DATA CODES = 87

  ASCII = 88

  EBCDIC = 88

  Touch-Tone Telephone = 89

  Data Code Size = 91

 ERROR SOURCES = 91

  Attenuation = 92

  Impulse Noise = 92

  Crosstalk = 92

  Echo = 93

  Phase Jitter = 93

  Envelope Delay Distortion = 93

  White Noise = 93

  Impact of Data Errors = 94

 PREVENTION = 94

  Telephone Line Conditioning = 95

  Lower Transmission Speed = 95

  Shielding = 95

  Line Drivers (Repeaters) = 95

  Better Equipment = 96

 ERROR DETECTION = 96

  Parity Check = 96

  Longitudinal Redundancy Check = 97

  Cyclic Redundancy Check = 97

  Sequence Checks = 99

  Message Sequence Numbers = 99

  Packet Sequence Numbers = 99

  Error Correction Codes = 100

  Miscellaneous Error Detection Techniques = 100

  Error Correction = 101

 DIGITAL DATA TRANSMISSION = 102

  Advantages of Digital Transmission = 102

  Digital Voice Using Pulse Code Modulation = 103

 INTERFACE = 104

  Interface Standards = 105

 SUMMARY = 109

  KEY TERMS = 109

  REVIEW QUESTIONS = 110

  PROBLEMS AND EXERCISES = 110

Chapter 4 Common Carrier Services = 113

 CHAPTER OBJECTIVES = 113

 THE U.S. TELEPHONE INDUSTRY = 113

  Predivestiture Organization = 114

  Postdivestiture Network = 114

  The Telecommunications Refzorm Act of 1996 = 116

 AVAILABLE SERVICES = 117

  Switched Lines = 117

  Leased Telegraph-Grade Lines = 118

  Leased Voice-Grade Lines = 118

  Wide Band Transmission = 118

  T-n Service = 118

  Fractional T-n = 118

  Switched Multimegabit Data Service = 119

 PACKET DISTRIBUTION NETWORKS = 119

  PDNs and the OSI Layers = 120

  Current PDN Implementations = 120

  Connection Options = 120

  Example of a PDN = 122

 OTHER SERVICES = 125

  Frame Relay = 125

  Asynchronous Transfer Mode = 126

  WATS = 127

  Satellite Service = 127

  Integrated Services Digital Networks = 127

  PBX and Centrex Services = 129

  Mobile Services = 129

  Circuit Switched Cellular Radio Telephone = 129

  Cellular Digital Packet Data = 130

  Mobile Radio Data = 130

  Personal Communication Service = 130

  Digital Subscriber Lines = 131

  Cable Modems = 132

  Service Providers = 133

 SUMMARY = 133

  KEY TERMS = 134

  REVIEW QUESTIONS = 134

  PROBLEMS AND EXERCISES = 135

Chapter 5 Introduction to Networks = 137

 CHAPTER OBJECTIVES = 137

 DEFINITIONS = 138

  WAN = 138

  MAN = 138

  LAN = 138

 THE RATIONALE BEHIND NETWORKS = 139

  Large Data Transfers = 139

  Resource Sharing = 140

  Groupware = 140

  Communication = 142

  Management Control = 143

  Cost-Effectiveness = 143

  Downsizing = 144

  Client/Server Computing : A Network Application Architecture = 144

  Advantages of C/S Computing = 148

  Disadvantages of C/S Computing = 149

  C/S Technology = 150

 LAN AND WAN CHARACTERISTICS = 152

 ADDED RESPONSIBILITIES OF NETWORKS = 153

 NETWORK TERMINOLOGY = 154

  Network and Node = 154

  Link, Path, and Circuit = 154

  Routing = 155

  Session and User = 155

  Packet Switching, Packet Distribution Network, and Circuit Switching = 155

  Store-and-Forward = 155

  Network Architecture and Topology = 156

 SUMMARY = 156

  KEY TERMS = 157

  REVIEW QUESTIONS = 157

  PROBLEMS AND EXERCISES = 157

Chapter 6 LAN Hardware = 159

 CHAPTER OBJECTIVES = 159

 SERVER PLATFORMS = 159

  File Services = 160

  Application Servers = 162

  Server Disk Drives = 163

  Server Memory = 164

  Processors and Processor Speed = 166

  Expansion and Power = 167

  System Bus = 167

 WORKSTATIONS = 168

  Diskless Workstations = 168

  Workstation Memory and Speed = 169

 BACKUP DEVICES = 169

  Floppy Diskette Drives = 169

  Hard Disk Drives = 170

  Optical Disk Drives = 170

  Magnetic Tape Drives = 171

 LAN ADAPTERS = 172

 PRINTERS = 172

 HUBS AND SWITCHES = 173

 UNINTERRUPTIBLE POWER SUPPLY = 175

 ADDITIONAL LAN HARDWARE = 176

 MAKING CONNECTIONS = 177

 SUMMARY = 179

  KEY TERMS = 181

  REVIEW QUESTIONS = 181

  PROBLEMS AND EXERCISES = 181

Chapter 7 LAN Topologies and Media Access Control = 183

 CHAPTER OBJECTIVES = 183

 THE LAN SYSTEM = 184

 LAN TOPOLOGIES AND STANDARDS = 184

  Bus Topology = 186

  Ring Topology = 187

  Star Topology = 188

  IEEE Project 802 Subcommittees = 190

  The ANSI FDDI Standard = 194

 DATA LINK AND MAC PROTOCOLS = 196

  Data Link Protocols = 197

  MAC Protocols = 200

  Contention = 200

  Token Passing = 202

 MAKING THE DECISIONS = 204

  Token Passing and CSMA/CD Compared = 204

  Topology and Protocol Tradeoffs = 205

 SUMMARY = 207

  KEY TERMS = 208

  REVIEW QUESTIONS = 208

  PROBLEMS AND EXERCISES = 208

Chapter 8 LAN System Software = 209

 CHAPTER OBJECTIVES = 209

 GENERIC FUNCTIONS OF LAN SYSTEM SOFTWARE = 209

  System Software Functions = 211

 LAN WORKSTATION SOFTWARE = 213

  Workstation Software Interface = 214

  Workstation System Software = 214

 SPECIFICS OF SERVER SOFTWARE = 215

  Server Operating Systems = 215

  LAN OS Functions = 216

 PRINT SPOOLER = 219

 BACKUP SOFTWARE = 221

 SOFTWARE REQUIREMENTS FOR SHARED USAGE = 222

  Hardware Configuration = 222

  Application Settings = 223

  Contention = 223

  Access Security = 226

 SOFTWARE LICENSE AGREEMENTS = 227

  Single User, Single Workstation = 230

  Single User, Multiple Workstaion = 230

  Restricted Number of Concurrent Users = 231

  Server License = 231

  Site License = 231

  Corporate License = 231

 NOVELL OPERATING SYSTEMS = 232

  NetWare 3.x = 233

  NetWare 4.x = 235

 MICROSOFT'S NETWORK OPERATING SYSTEMS = 239

  Window 95 = 239

  Window NT Server = 240

 BANYAN VINES = 241

 INTEROPERABILITY OF SERVER SOFTWARE = 242

  CASE STUDY = 242

 SUMMARY = 244

  KEY TERMS = 246

  REVIEW QUESTIONS = 246

  PROBLEMS AND EXERCISES = 246

Chapter 9 LAN Considerations = 249

 CHAPTER OBJECTIVES = 249

 LAN ALTERNATIVES = 249

  LAN Implementation Alternatives = 249

  Other Implementations = 250

  Comparison of Alternatives = 254

 LAN SELECTION CRITERIA = 254

  Cost = 255

  Number of Workstations = 255

  Type of Workstations = 256

  Number of Concurrent Users = 256

  Type of Use = 256

  Number and Type of Printers = 257

  Distance and Medium = 257

  Speed = 258

  Applications = 258

  Expandability = 258

  Device Connectivity = 259

  Connectivity to Other Networks = 259

  LAN Software and Hardware = 259

  Adherence to Established Standards = 259

  Vendor and Support = 260

  Manageability = 260

  Security = 261

  CASE STUDY = 261

 SUMMARY = 266

  KEY TERMS = 266

  REVIEW QUESTIONS = 267

  PROBLEMS AND EXERCISES = 267

Chapter 10 WAN Hardware = 269

 CHAPTER OBJECTIVES = 269

 TERMINALS = 269

  Terminal Types = 270

  Terminal Capabilities = 272

  Advantages of Dumb, Smart, and Intelligent Terminals = 274

  Input and Output = 274

  Cost = 275

  Speed = 275

  Maintenance and Support = 275

  Display Attributes = 276

  Data Link Protocol = 276

  Terminal Configurations = 276

 MULTIPLEXERS = 280

  How Multiplexers Work = 280

  Types of Multiplexers = 281

  Multiplexer Configurations = 284

 CONCENTRATORS = 285

 FRONT-END PROCESSORS = 286

 PROTOCOL CONVERTERS = 287

 DIAGNOSTIC AND MISCELLANEOUS EQUIPMENT = 288

  Security Hardware = 288

  Line Monitors = 289

  Breakout Boxes = 290

  Auto-Call Units = 291

  Port Concentrator = 292

  Port Selector or Data Switch = 292

  Cluster Controllers = 293

  Private Branch Exchanges = 293

  Matrix Switches = 294

  CASE STUDY = 294

 SUMMARY = 298

  KEY TERMS = 298

  REVIEW QUESTIONS = 299

  PROBLEMS AND EXERCISES = 299

Chapter 11 WAN System Topologies and Transmission Services = 301

 CHAPTER OBJECTIVES = 301

 WAN TOPOLOGIES = 301

  Star Network = 302

  Hierarchical Network = 303

  Interconnected (Plex) Network = 304

  Hybrid Networks = 306

 WAN DATA LINK PROTOCOLS = 306

  Asynchronous Transmission = 306

  Effectiveness of Asynchronous Transmission = 309

  Why Asynchronous Transmission Is So Popular = 309

 SYNCHRONOUS TRANSMISSION = 310

 CHARACTER SYNCHRONOUS PROTOCOLS = 310

  Data Delineation in Synchronous Protocols = 310

  Standards for Character Synchronous Protocols = 311

  Byte Count Synchronous Protocols = 313

  Bit Synchronous Data Link Control = 314

  Synchronous Data Link Control = 315

 CHOOSING A DATA LINK PROTOCOL = 317

 THE OSI NETWORK LAYER = 319

  Message Routing = 319

  Centralized Routing Determination : The Network Routing Manager = 320

  Distributed Routing Determination = 321

  Static Routing = 321

  Adaptive Routing = 322

  Broadcast Routing = 322

 THE OSI TRANSPORT LAYER = 323

  CASE STUDY = 326

 SUMMARY = 337

  KEY TERMS = 337

  REVIEW QUESTIONS = 338

  PROBLEMS AND EXERCISES = 338

Chapter 12 WAN System Software = 341

 CHAPTER OBJECTIVES = 341

 THE OSI SESSION LAYER = 341

 SOFTWARE OVERVIEW = 342

  Application Software = 342

  System Software = 342

  Operating System = 343

  I/O Drivers = 344

  Access Methods = 344

  Database and File Management Systems = 345

  Transaction Control Process = 345

  Example of Transaction Flow = 345

 ACCESS METHODS = 348

  Application-Terminal Connection = 349

  Accessing a Terminal = 349

 TRANSACTION CONTROL PROCESS = 351

  TCP Configuration = 351

  Single Threading Versus Multithreading = 351

  Maintaining Context = 354

  Memory Management = 355

  Transaction Routing = 355

  Transaction Log = 356

  Security and Statistics = 356

  Message Priorities = 357

  Application Development = 357

  Operation Interface = 357

  Other TCP Functions = 357

 SUMMARY = 358

  KEY TERMS = 359

  REVIEW QUESTIONS = 359

  PROBLEMS AND EXERCISES = 359

Chapter 13 Accessing and Using the Internet = 361

 CHAPTER OBJECTIVES = 361

 TERMINOLOGY : AN INTERNET, THE INTERNET, AND INTRANETS = 361

 INTERNET HISTORY = 363

 GAINING ACCESS TO THE INTERNET = 365

  Work = 365

  School = 365

  Public Services = 365

  Freenets = 366

  Individual Paid Subscription = 366

  Internet Hardware and Software = 366

  Choosing a Service Provider = 367

  Software and Hardware = 371

 GETTING STARTED AS AN ISP = 372

 INTERNET SERVICES AND USES = 376

 BUSINESS ON THE INTERNET = 379

  Internet Businesses = 380

  Advantages and Disadvantages of Internet Use for Business = 382

  Transaction Requirements = 383

  Payment = 383

  Security and Verification = 386

  Credit Card Security = 386

  Digital Cash Transactions = 387

  Anonymity = 388

  Accountability and Taxability = 388

 THE INTERNET STORE = 389

  Today's Internet transaction = 390

  Consequences of Internet Business = 391

 SECURE ENTERPRISE NETWORKS = 392

 VIRTUAL PRIVATE NETWORKS = 394

 SUMMARY = 395

  KEY TERMS = 396

  REVIEW QUESTIONS = 396

  PROBLEMS AND EXERCISES = 397

Chapter 14 Internet Technology = 399

 CHAPTER OBJECTIVES = 399

 INTERNET ADDRESSES = 399

  Internet Naming Conventions = 400

  Subnet Addressing = 404

 INTERNET NODE ADDRESSES = 405

  Dynamic Addressing = 405

  Internet Addressing on LANs = 406

 IP ROUTING = 407

  IP Routing Algorithm = 408

 OTHER INTERNET SERVICES = 409

  Simple Mail Transfer Protocol = 409

  Simple Network Management Protocol = 409

  Telnet = 409

  File Transfer Protocol = 411

  Archie = 411

  Gopher, Veronica, Jughead, and WAIS = 411

  Search Engines = 411

 INTERNET TOOLS = 411

  Finger = 412

  Ping = 412

  Tracert = 412

  Talk and Internet Relay Chat = 412

  WHOIS Database = 413

  Web Page Design Tools = 413

  IPng or IPv6 = 413

  Key Upgrades in IPv6 = 414

 THE INFORMATION SUPERHIGHWAY = 416

  Building the Information Superhighway = 417

  Information Superhighway Uses = 418

  Social Implications = 419

 SUMMARY = 420

  KEY TERMS = 420

  REVIEW QUESTIONS = 421

  PROBLEMS AND EXERCISES = 421

Chapter 15 WAN Implementations = 423

 CHAPTER OBJECTIVES = 423

 VENDOR WANS = 423

 IBM'S SYSTEMS NETWORK ARCHITECTURE = 424

  Why SNA? = 424

  SNA Layers = 424

  Logical Units and Sessions = 425

  Systems Services Control Point = 428

  Addressing = 429

  Communication Between Users = 430

  Additional SNA Elements and Capabilities = 430

  Advanced Peer-to-Peer Networking = 431

 INTERNATIONAL NETWORKS = 432

  Politics = 433

  Security = 433

  Regulations = 433

  Hardware = 434

  Language = 434

  Other Issues = 435

  CASE STUDY = 436

 SUMMARY = 440

  KEY TERMS = 441

  REVIEW QUESTIONS = 441

  PROBLEMS AND EXERCISES = 441

Chapter 16 Network Interconnections = 443

 CHAPTER OBJECTIVES = 443

 THE OSI REFERENCE MODEL REVISITED = 444

 LAN-TO-LAN AND WAN-TO-WAN CONNECTIONS = 450

  Repeaters = 452

  Bridges = 453

  The Spanning Tree Algorithm = 457

  Source Routing = 459

  Other Bridge Capabilities = 460

  Routers = 460

  TCP/IP = 461

  ISO Routing Standards = 464

  Gateways = 464

  Which Interface Is Right for You? = 465

 LAN-TO-HOST CONNECTIONS = 465

  The Host as a LAN Node = 468

  Asynchronous Connections = 468

  Other Types of Host Connections = 472

  IBM System Connections = 472

 INTERCONNECTION UTILITIES = 472

 SUMMARY = 473

  KEY TERMS = 475

  REVIEW QUESTIONS = 475

  PROBLEMS AND EXERCISES = 476

Chapter 17 Network Management Objectives = 477

 CHAPTER OBJECTIVES = 477

 HISTORY OF NETWORK MANAGEMENT = 477

 NETWORK MANAGEMENT OBJECTIVES = 478

  Supporting System Users = 478

  Measures of System Effectiveness = 479

  Cost-Effectiveness = 485

 MEETING THE OBJECTIVES = 486

  Competent Staff = 487

  Design and Configuration = 487

  Ergonomics = 488

  Diagnosis = 488

  Planning = 489

  Documentation, Standards, and Procedures = 489

 NETWORK MANAGEMENT ORGANIZATION = 489

  Control = 490

  Problem-Reporting Procedure = 491

  Additional Control Center Responsibilities = 492

 LAN VERSUS WAN MANAGEMENT = 492

  LAN Management Tasks = 495

  WAN Management Tasks = 501

 SUMMARY = 504

  KEY TERMS = 504

  REVIEW QUESTIONS = 504

  PROBLEMS AND EXERCISES = 505

Chapter 18 Network Management Systems = 507

 CHAPTER OBJECTIVES = 507

 NETWORK MANAGEMENT SYSTEM SOFTWARE = 507

  A Generic Network Management System = 508

 NETWORK MANAGEMENT PROTOCOLS = 512

  Simple Network Management Protocol = 512

  Common Management Information Protocol = 514

 IBM'S NETWORK MANAGEMENT SYSTEM = 515

  Netview = 515

  Netview/PC = 515

  Netview/6000 = 516

  Netview Architecture = 516

 NOVELL'S NETWORK MANAGEMENT SYSTEM = 516

 NETWORK MANAGEMENT TOOLS = 517

  Diagnostic Tools = 518

  Monitoring Tools = 519

  Management Tools = 521

 SUMMARY = 522

  KEY TERMS = 522

  REVIEW QUESTIONS = 523

  PROBLEMS AND EXERCISES = 523

Chapter 19 Security, Recovery, and Network Applications = 525

 CHAPTER OBJECTIVES = 525

 THE PRESENTATION LAYER = 526

 THE APPLICATION LAYER = 526

 SECURITY = 526

  Security Policy = 526

  Vendor-Provided Security = 527

  Physical Security = 527

  Encryption = 529

  User Identification and Authentication = 531

  Ultrasensitive Applications = 532

  Switched Ports with Dial-In Access = 534

  Recognizing Unauthorized Access Attempts = 534

  Automatic Logoff = 535

  Transaction Logs = 535

  Computer Viruses, Worms, and Trojan Horses = 535

 ERROR DETECTION AND RECOVERY = 537

  Message Logging = 537

  Database-System Consistency = 538

  Message Processing = 538

  Recovery After Safe Storing = 539

 TRANSACTION DESIGN = 540

  Review of Transaction Activities = 541

  Grouping Activities into a Single Transaction = 541

  Advantages and Disadvantages of Single Versus Multiple Transaction = 542

 WORKGROUP SOFTWARE = 544

  Mail Administration = 544

  E-Mail Interchange Standard X.400 = 545

  The ITU X.500 Standard = 546

  Electronic Conferencing Applications = 547

  Work-Flow Automation = 547

  Document Coauthoring and Document Management = 549

  Group Decision Support = 550

  Time-Staged Delivery Systems = 550

 SUMMARY = 551

  KEY TERMS = 552

  REVIEW QUESTIONS = 552

  PROBLEMS AND EXERCISES = 553

Chapter 20 Distributed Systems = 555

 CHAPTER OBJECTIVES = 555

 DISTRIBUTED SYSTEM DEFINITIONS = 555

 EVOLUTION OF DISTRIBUTED SYSTEMS = 557

  Duplicated Databases and Inconsistent Data = 557

  Centralization = 557

  Disadvantages of Centralization = 559

  Networked Systems = 559

 DISTRIBUTED FILE SYSTEMS = 560

 ADVANTAGES AND DISADVANTAGES OF DISTRIBUTED SYSTEMS = 561

  Advantages = 561

  Disadvantages = 562

  Determining Participating Nodes = 562

  Routing, Transmission, and Processing = 563

 DATABASE MANAGEMENT IN DISTRIBUTED SYSTEMS = 565

  Rules for a Distributed Database = 565

 SUMMARY = 567

  KEY TERMS = 568

  REVIEW QUESTIONS = 568

  PROBLEMS AND EXERCISES = 568

APPENDIX A = 569

APPENDIX B = 573

GLOSSARY = 577

INDEX = 609



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