互联网是20世纪最伟大的科技发明之一,它为人类提供了全新的通信和信息交互手段,极大地加速了全球信息化进程。然而,当网络的规模和应用范围大大超出原始设计者的预期目标时,互联网遇到了极大的挑战:服务质量和安全难以保证,网络管理难以部署,地址资源枯竭,路由表恶性膨 The Internet is one of the greatest technological inventions in the 20th century. It provides a brand new means of communication and information exchange for human beings, greatly accelerating the global informationization process. However, the Internet poses great challenges when the size and application of the network go beyond the original designer’s expectations. The quality of service and security is hard to guarantee. Network management is difficult to deploy. Address resources are exhausted.