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The Internet has been becoming an important infrastructure of network society. The success of the Internet is mainly due to its architecture. In this presentation, the author shares the experience of the design and the operation of China Education and Research Network (CERNET), the second generation China Education and Research Network (CNGI-CERNET2) and summarizes the challenges which the future Internet must address. They are: the routing system scalability, the security, the quality of service, the charging model, the mobility and the transition. Some examples are also discussed in the presentation.