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Chapter 1 Computer Networks1

1.1 Data Communication1

1.2 Linking Terminals and Computers2

1.3 Data Communication Software3

1.4 Networking4

1.5 Summary6

自测题7

关键词解释8

英文词汇10

正文注释10

参考译文10

Chapter 2 Network Basics15

2.1 What Is an Network？15

2.2 LANs，MANs and WANs15

2.3 Open Systems Interconnection(OSI)Reference Model16

2.3.1 The Physical Layer16

2.3.2 The Data Link Layer17

2.3.3 The Network Layer17

2.3.4 The Transport Layer18

2.3.5 The Session Layer19

2.3.6 The Presentation Layer19

2.3.7 The Application Layer20

2.4 OSI Model and Communication Between Systems20

2.4.1 Information Formats21

2.4.2 Connection-Oriented and Connectionless Network Services21

2.5 Standards Organizations21

2.5.1 International Organization for Standardization(ISO)21

2.5.2 American National Standards Institute(ANSI)21

2.5.3 Institute of Electrical and Electronic Engineers(IEEE)21

2.5.4 Internet Architecture Board(IAB)21

自测题22

关键词解释23

英文词汇24

正文注释25

参考译文26

Chapter 3 Intranet31

3.1 Intranet Introduction31

3.2 Application in Remote Access32

3.3 Intranet Securities33

自测题34

关键词解释35

英文词汇36

正文注释37

参考译文37

Chapter 4 Uses of Computer Networks40

4.1 Business Applications40

4.2 Home Applications42

4.3 Mobile Users46

4.4 Social Issues49

自测题51

关键词解释54

英文词汇55

正文注释56

参考译文56

Chapter 5 LAN and WAN66

5.1 LAN Technology66

5.1.1 What Is a LAN？66

5.1.2 LAN Protocols and the OSI Reference Model66

5.1.3 LAN Media—Access Methods66

5.1.4 LAN Transmission Methods66

5.1.5 LAN Topologies67

5.1.6 LAN Devices67

5.2 WAN Technology68

5.2.1 What Is a WAN？68

5.2.2 WAN Protocols and the OSI Reference Model68

5.2.3 WAN Application Technology68

5.2.4 WAN Devices69

自测题69

关键词解释71

英文词汇72

正文注释73

参考译文73

Chapter 6 Transmission Media(1)—Wired Media77

6.1 Magnetic Media77

6.2 Twisted Pair78

6.3 Baseband Coaxial Cable79

6.4 Broadband Coaxial Cable79

6.5 Fiber Optics80

自测题81

关键词解释82

英文词汇83

正文注释84

参考译文84

Chapter 7 Transmission Media(2)—Wireless Media88

7.1 Radio Transmission88

7.2 Microwave Transmission89

7.3 The Telephone System91

自测题92

关键词解释92

英文词汇93

正文注释94

参考译文94

Chapter 8 Bridges,Routers and Gateways98

8.1 Benefits98

8.2 Interconnection Basics99

8.3 Bridges100

8.4 Subnetworks100

8.5 Routers101

8.6 Gateways102

8.7 Advantages103

8.8 Intelligent Gateways104

8.9 Conclusion105

自测题105

关键词解释106

英文词汇107

正文注释107

参考译文107

Chapter 9 Multiple Access Method113

9.1 Frequency Division Multiple Access(FDMA)114

9.2 Time Division Multiple Access(TDMA)115

9.3 Code Division Multiple Access(CDMA)116

9.4 Space-Division Multiple Access(SDMA)117

自测题118

关键词解释119

英文词汇120

正文注释121

参考译文121

Chapter 10 Fast and Switched Ethernet126

10.1 Generations of LANs126

10.1.1 First Generation126

10.1.2 Second Generation127

10.1.3 Third Generation127

10.1.4 Fourth Generation127

10.2 Switched Ethernet127

10.2.1 Switched Ethernet Architecture128

10.2.2 Store and Forward and Cut-Through Switches129

10.3 Virtual LAN130

10.4 Fast Ethernet131

10.4.1 100BaseT132

10.4.2 AnyLAN132

10.5 Fast/Switched Ethernet Worksheet133

10.6 Summary133

自测题133

关键词解释134

英文词汇135

正文注释136

参考译文136

Chapter 11 Frame Relay143

11.1 The Purpose of Frame Relay143

11.2 Pertinent Standards144

11.3 Typical Frame Relay Topology145

11.4 The Frame Relay Layers145

11.5 The Frame Relay Core Functions146

11.6 Potential Congestion Problems146

自测题147

关键词解释148

英文词汇149

正文注释149

参考译文150

Chapter 12 Asynchronous Transfer Mode(ATM)153

12.1 What Is ATM？153

12.2 The VPI and VCI Labels153

12.3 ATM Layers154

12.4 ATM Protocol Data Units(Cells)155

12.5 Addressing in an ATM Network156

自测题157

关键词解释158

英文词汇158

正文注释159

参考译文159

Chapter 13 Mobile Communications Technologies163

13.1 What Is Mobile Communications System？163

13.2 Typical Cellular Systems Topology163

13.3 Cordless Systems Operations in More Detail164

13.3.1 CT2164

13.3.2 DECT165

13.4 Third-Generation Mobile Systems165

13.5 Mobile Communications Summary166

自测题167

关键词解释168

英文词汇169

正文注释170

参考译文170

Chapter 14 Error Control Techniques174

14.1 What Is Error Control？174

14.2 Error Detection and Correction174

14.2.1 Error-Correcting Codes175

14.2.2 Error-Detecting Codes175

14.3 Error Control Techniques176

14.3.1 Forward Error Correction(FEC)176

14.3.2 Automatic Repeat Request(ARQ)176

14.3.3 FEC vs ARQ177

14.4 Hybrid Error Control177

自测题178

关键词解释179

英文词汇179

正文注释180

参考译文181

Chapter 15 Network Protocol184

15.1 Protocols and the OSI Model184

15.2 Internet Protocol185

15.3 The IP Address186

15.4 Functions of IPv4 Header Fields186

15.5 Problems with IP and the IP Address187

15.6 TCP Operations187

自测题188

关键词解释189

英文词汇190

正文注释190

参考译文191

Chapter 16 The Wireless Web195

16.1 WAP—the Wireless Application Protocol195

16.2 I-mode197

16.3 Second-Generation Wireless Web202

自测题205

关键词解释207

英文词汇207

正文注释208

参考译文208

Chapter 17 Computer Viruses217

17.1 History217

17.2 How Viruses Act217

17.3 What Kind of Viruses Are There218

17.3.1 Macro Viruses218

17.3.2 Network Viruses218

17.3.3 Logic Bombs219

17.3.4 RATs219

17.3.5 What Is a Computer Worm？220

17.3.6 Well Known Examples of the Computer Worm221

17.3.7 Protecting Yourself Against Computer Worms221

17.3.8 Security Method221

自测题223

关键词解释225

英文词汇225

正文注释225

参考译文226

Chapter 18 Network Management Basics231

18.1 What Is Network Management？231

18.2 Network Management Architecture231

18.3 ISO Network Management Model232

18.3.1 Performance Management232

18.3.2 Configuration Management233

18.3.3 Accounting Management233

18.3.4 Fault Management233

18.3.5 Security Management234

自测题234

关键词解释235

英文词汇236

正文注释237

参考译文237

Chapter 19 Linux240

19.1 What Is Linux？240

19.2 Linux Versus UNIX240

19.3 Linux Features241

19.4 Hardware Requirements242

19.5 Common Commands242

自测题244

关键词解释245

英文词汇245

正文注释246

参考译文246

Chapter 20 Network Services250

20.1 DNS—Domain Name System250

20.2 Electronic Mail251

20.3 The World Wide Web252

20.3.1 The Client Side252

20.3.2 The Server Side253

20.4 Usenet News253

自测题254

关键词解释255

英文词汇256

正文注释257

参考译文257

Chapter 21 Internet Security(1)261

21.1 Protecting Confidential Information261

21.1.1 Network Packet Sniffers262

21.1.2 IP Spoofing263

21.1.3 Password Attacks263

21.1.4 Distribution of Sensitive Information263

21.1.5 Man-in-the-Middle Attacks264

21.2 Protecting Your Network:Maintaining Internal Network System Integrity264

21.2.1 Network Packet Sniffers265

21.2.2 IP Spoofing265

21.2.3 Password Attacks265

21.2.4 Denial-of-Service Attacks266

21.2.5 Application-Layer Attacks266

自测题267

关键词解释268

英文词汇269

正文注释270

参考译文271

Chapter 22 Internet Security(2)276

22.1 Trusted,Untrusted and Unknown Networks276

22.1.1 Trusted Networks276

22.1.2 Untrusted Networks277

22.1.3 Unknown Networks277

22.2 Establishing a Security Perimeter277

22.3 Developing Your Security Design278

22.3.1 Knowing Your Enemy278

22.3.2 Counting the Cost279

22.3.3 Identifying Your Assumptions279

22.3.4 Controlling Your Secrets279

22.3.5 Remembering Human Factors279

22.3.6 Knowing Your Weaknesses280

22.3.7 Limiting the Scope of Access280

22.3.8 Understanding Your Environment280

22.3.9 Limiting Your Trust280

22.3.10 Remembering Physical Security281

22.3.11 Making Security Pervasive281

自测题281

关键词解释282

英文词汇283

正文注释284

参考译文285

附录 自测题答案289

参考文献291