1.1 Quality-of-Service Definition1.2 Transmission Infrastructure Evolution1.3 The First Global Communications Network: PSTN1.4 The Internet and TCP/IP History1.5 The Computer Age1.6 Computer Internetworking1.7 X.25 Packet Switching1.8 The Evolution of Packet Switching: Frame Relay1.9 Asynchronous Transfer Mode1.10 Ethernet Beyond the LAN1.11 IP as the Converged Protocol1.12 The Emergence of Service-Level Agreements1.13 The Service Provider Virtual Private Network1.14 Evolution of the Telecommunications Industry1.15 The Next-Generation Network Vision1.16 The Cisco Next-Generation Network Framework1.17 The Network Requirements1.18 The Path to the Next-Generation Network1.19 Upgrade the Existing ISP Network1.20 Upgrade the Existing Enterprise VPN Infrastructure1.21 A Completely New Core Network1.22 What’s in This Book1.23 Summary