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Thoroughly updated to reflect the CompTIA Network+ N10-006 exam, Networking Essentials, Fourth Edition is a practical, up-to-date, and hands-on guide to the basics of networking. Written from the viewpoint of a working network administrator, it requires absolutely no experience with either network concepts or day-to-day network management.

Networking Essentials, Fourth Edition guides readers from an entry-level knowledge in computer networks to advanced concepts in Ethernet and TCP/IP networks; routing protocols and router configuration; local, campus, and wide area network configuration; network security; wireless networking; optical networks; Voice over IP; the network server; and Linux networking. This new edition includes expanded coverage of mobile and cellular communications; configuring static routing with RIPv2, OSPF, EIGRP, and IS-IS; physical security, access control, and biometric access control; cloud computing and virtualization; and codes and standards.

Clear goals are outlined for each chapter, and every concept is introduced in easy to understand language that explains how and why networking technologies are used. Each chapter is packed with real-world examples and practical exercises that reinforce all concepts and guide you through using them to configure, analyze, and fix networks.

Key Pedagogical Features

NET-CHALLENGE SIMULATION SOFTWARE provides hands-on experience with entering router and switch commands, setting up functions, and configuring interfaces and protocols
WIRESHARK NETWORK PROTOCOL ANALYZER presents techniques and examples of data traffic analysis throughout
PROVEN TOOLS FOR MORE EFFECTIVE LEARNING AND NETWORK+ PREP, including chapter outlines, summaries, and Network+ objectives
WORKING EXAMPLES IN EVERY CHAPTER to reinforce key concepts and promote mastery
KEY TERM DEFINITIONS, LISTINGS, AND EXTENSIVE GLOSSARY to help you master the language of networking
QUESTIONS, PROBLEMS, AND CRITICAL THINKING QUESTIONS to help you deepen your understanding
CD-ROM includes Net-Challenge Simulation Software, including seven hands-on labs and the Wireshark Network Protocol Analyzer Software examples.



Introduction xxi

CHAPTER 1 Introduction to Computer Networks 2

Chapter Outline 3

Objectives 3

Key Terms 3

1-1 Introduction 5

1-2 Network Topologies 7

Section 1-2 Review 12

Test Your Knowledge 12

1-3 The OSI Model 13

Section 1-3 Review 15

Test Your Knowledge 16

1-4 The Ethernet LAN 17

IP Addressing 21

Section 1-4 Review 23

Test Your Knowledge 23

1-5 Home Networking 24

Securing the Home Network 35

IP Addressing in the Home Network 36

Section 1-5 Review 38

Test Your Knowledge 39

1-6 Assembling An Office LAN 40

Section 1-6 Review 45

Test Your Knowledge 46

1-7 Testing and Troubleshooting a LAN 47

Section 1-7 Review 50

Test Your Knowledge 50

Summary 51

Questions and Problems 51

Certification Questions 60

CHAPTER 2 Physical Layer Cabling: Twisted Pair 64

CHAPTER OUTLINE 65

OBJECTIVES 65

KEY TERMS 65

2-1 Introduction 67

2-2 Structured Cabling 68

Horizontal Cabling 72

Section 2-2 Review 74

Test Your Knowledge 75

2-3 Unshielded Twisted-Pair Cable 76

Shielded Twisted-Pair Cable 78

Section 2-3 Review 79

Test Your Knowledge 79

2-4 Terminating CAT6/5E/5 UTP Cables 80

Computer Communication 82

Straight-through and Crossover Patch Cables 84

Section 2-4 Review 92

Test Your Knowledge 93

2-5 Cable Testing and Certification 94

Section 2-5 Review 98

Test Your Knowledge 98

2-6 10 Gigabit Ethernet over Copper 99

Overview 99

Alien Crosstalk 100

Signal Transmission 101

Section 2-6 Review 102

Test Your Knowledge 102

2-7 Troubleshooting Cabling Systems 103

Installation 103

Cable Stretching 104

Cable Failing to Meet Manufacturer Specifications 104

CAT5e Cable Test Examples 105

Section 2-7 Review 111

Test Your Knowledge 111

Summary 113

Questions and Problems 113

Certification Questions 122

CHAPTER 3 Physical Layer Cabling: Fiber Optics 126

Chapter Outline 127

Objectives 127

Key Terms 127

3-1 Introduction 128

3-2 The Nature of Light 131

Graded-Index Fiber 135

Single-Mode Fibers 135

Section 3-2 Review 137

Test Your Knowledge 137

3-3 Fiber Attenuation and Dispersion 137

Attenuation 138

Dispersion 139

Dispersion Compensation 140

Section 3-3 Review 141

Test Your Knowledge 141

3-4 Optical Components 142

Intermediate Components 144

Detectors 144

Fiber Connectorization 146

Section 3-4 Review 147

Test Your Knowledge 148

3-5 Optical Networking 148

Defining Optical Networking 149

Building Distribution 151

Campus Distribution 154

Section 3-5 Review 157

Test Your Knowledge 158

3-6 Safety 159

Section 3-6 Review 160

Test Your Knowledge 160

Summary 161

Questions and Problems 161

Certification Questions 164

CHAPTER 4 Wireless Networking 168

Chapter Outline 169

Objectives 169

Key Terms 169

4-1 Introduction 170

4-2 The IEEE 802.11 Wireless LAN Standard 172

Section 4-2 Review 179

Test Your Knowledge 179

4-3 802.11 Wireless Networking 180

Section 4-3 Review 189

Test Your Knowledge 190

4-4 Bluetooth, WiMAX, RFID, and Mobile Communications 190

Bluetooth 190

WiMAX 193

Radio Frequency Identification 194

Section 4-4 Review 198

Test Your Knowledge 199

4-5 Securing Wireless LANS 199

Section 4-5 Review 202

Test Your Knowledge 203

4-6 Configuring a Point-to-Multipoint Wireless LAN: A Case Study 203

1. Antenna Site Survey 204

2. Establishing a Point-to-Point Wireless Link to the Home Network 204

3-4. Configuring the Multipoint Distribution/Conducting an RF Site Survey 206

5. Configuring the Remote Installations 208

Section 4-6 Review 208

Test Your Knowledge 209

Summary 210

Questions and Problems 210

Critical Thinking 215

Certification Questions 216

CHAPTER 5 Interconnecting the LANs 218

Chapter Outline 219

Objectives 219

Key Terms 219

5-1 Introduction 220

5-2 The Network Bridge 221

Section 5-2 Review 226

Test Your Knowledge 227

5-3 The Network Switch 228

Hub-Switch Comparison 230

Managed Switches 233

Multilayer Switches 238

Section 5-3 Review 238

Test Your Knowledge 239

5-4 The Router 239

The Router Interface: Cisco 2800 Series 240

The Router Interface-Cisco 2600 Series 241

Section 5-4 Review 244

Test Your Knowledge 244

5-5 Interconnecting LANs with the Router 245

Gateway Address 247

Network Segments 247

Section 5-5 Review 248

Test Your Knowledge 248

5-6 Configuring the Network Interface-Auto-Negotiation 249

Auto-Negotiation Steps 249

Full-Duplex/Half-Duplex 250

Section 5-6 Review 252

Test Your Knowledge 252

Summary 253

Questions and Problems 253

Critical Thinking 258

Certification Questions 259

CHAP