Introduction xix
Part I Domain 1.0: Networking Fundamentals 1
Chapter 1 OSI Model 3
OSI Model 3
Data Encapsulation 12
Chapter 2 Network Topologies 17
Network Topologies 17
Network Types and Characteristics 19
Network Roles 21
Service- Related Entry Points 22
Virtual Network Concepts 22
Provider Links 24
Chapter 3 Cables and Connectors 29
Cable Types 30
Connector Types 33
Cable Management 35
Ethernet Standards 36
Chapter 4 IP Addressing 41
IP Addresses 42
IPv4 vs. IPv6 48
Chapter 5 Ports and Protocols 55
IP Protocol Types 55
Application Layer Protocols 60
Chapter 6 Network Services 67
Dhcp 67
Dns 70
Ntp 75
Chapter 7 Network Architecture 79
Three- Tiered Architecture 79
Software- Defined Networking 82
Spine and Leaf Architecture 83
Traffic Flows 84
Data Center Locations 84
Storage Area Networking 85
Chapter 8 Cloud Computing 91
Deployment Models 91
Service Models 93
Part II Domain 2.0: Network Implementations 103
Chapter 9 Network Devices 105
Networking Devices 105
Networked Devices 111
Chapter 10 Routing and Bandwidth Management 117
Routing 118
Bandwidth Management 124
Chapter 11 Switching 129
Ethernet Basics 129
Switching 131
Chapter 12 Wireless Standards 141
Wireless Networking 142
Cellular Technologies 149
Part III Domain 3.0: Network Operations 153
Chapter 13 Network Availability 155
Performance Metrics 156
Snmp 158
Network Device Logs 159
Interface Errors or Alerts 161
Environmental Sensors 162
Baselines 162
Uptime/Downtime 163
Chapter 14 Organizational Documents and Policies 167
Plans and Procedures 167
Hardening and Security Policies 171
Common Documentation 172
Common Agreements 175
Chapter 15 High Availability and Disaster Recovery 179
Load Balancing 180
Multipathing 180
NIC Teaming 180
Redundant Hardware/Clusters 181
Facilities and Infrastructure Support 182
Redundancy and High Availability Concepts 185
Network Device Backup/Restore 188
Part IV Domain 4.0: Network Security 191
Chapter 16 Security Concepts 193
Confidentiality, Integrity, and Availability 193
Threats 194
Vulnerabilities 194
Exploits 195
Least Privilege 195
Role- Based Access 196
Zero Trust 196
Defense in Depth 197
Authentication Methods 198
Risk Management 201
Siem 202
Chapter 17 Network Attacks 207
Technology- Based Attacks 207
Human and Environmental Attacks 212
Chapter 18 Network Hardening 217
Best Practices 217
Wireless Security 223
IoT Access Considerations 227
Chapter 19 Remote Access 231
Virtual Private Networks 232
Remote Desktop Gateway 234
Virtual Network Computing (VNC) 235
Virtual Desktop 235
Authentication and Authorization Considerations 236
In- band vs. Out- of- band Management 236
Chapter 20 Physical Security 241
Detection Methods 241
Prevention Methods 243
Asset Disposal 246
Part V Domain 5.0: Network Troubleshooting 251
Chapter 21 Network Troubleshooting Methodology 253
Identify the Problem 254
Establish a Theory of Probable Cause 256
Test the Theory to Determine the Cause 256
Establish a Plan of Action to Resolve the Problem and Identify Potential Effects 257
Implement the Solution or Escalate as Necessary 258
Verify Full System Functionality and, if Applicable, Implement Preventive Measures 259
Document Findings, Actions, Outcomes, and Lessons Learned 259
Chapter 22 Troubleshooting Cable Connectivity 263
Specifications and Limitations 264
Cable Considerations 265
Cable Application 265
Common Issues 267
Common Tools 271
Chapter 23 Network Software Tools and Commands 275
Software Tools 275
Command- Line Tools 279
Basic Network Platform Commands 284
Chapter 24 Troubleshooting Wireless Connectivity 289
Specifications and Limitations 289
Considerations 291
Common Issues 293
Chapter 25 Troubleshooting Network Issues 301
Considerations 301
Common Issues 303
Index 315
