Cisco IOS Specifics and Security 145

"Do I Know This Already?" Quiz 145

Foundation Topics 150

Cisco Hardware 150

Random-Access Memory (RAM) 151 Nonvolatile RAM (NVRAM) 151 System Flash 151 Central Processing Unit 152 Read-Only Memory 153 Configuration Registers 154 Cisco Interfaces 156 Saving and Loading Files 158

show and debug Commands 159 Router CLI 159 show Commands 159 Debugging Cisco Routers 168

Password Recovery 174

Basic Security on Cisco Routers 179

IP Access Lists 182

Access Lists on Cisco Routers 182 Extended Access Lists 187

Foundation Summary 191

Scenario 195

Scenario 4-1: Configuring Cisco Routers for Passwords and Access Lists 195

Scenario Answers 197

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