Security Protocols 199

"Do I Know This Already?" Quiz 199

Foundation Topics 208

Authentication, Authorization, and Accounting (AAA) 208 Authentication 210 Authorization 210 Accounting 211

Remote Authentication Dial-In User Service (RADIUS) 212 RADIUS Configuration Task List 215

Terminal Access Controller Access Control System Plus (TACACS+) 218 TACACS+ Configuration Task List 220 TACACS+ Versus RADIUS 224

Kerberos 225

Kerberos Configuration Task List 228

Virtual Private Dial-Up Networks (VPDN) 229 VPDN Configuration Task List 232

Encryption Technology Overview 235

Data Encryption Standard (DES) and Triple Data Encryption

Standard (3DES) 237

Digital Signature Standard (DSS) 238

Message Digest 5 (MD5) and Secure Hash Algorithm (SHA) 239 Diffie-Hellman 240 IP Security IPSec 242

Internet Key Exchange (IKE) 246

IKE Phase I Messages Types 1-6 247 IKE Phase II Message Types 1-3 248 Cisco IOS IPSec Configuration 252

Certificate Enrollment Protocol (CEP) 259 Foundation Summary 260 Q & A 265 Scenario 271

Scenario 5-1: Configuring Cisco Routers for IPSec 271

Scenario Answers 275 Scenario 5-1 Solutions 275

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