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The next generation of applications will follow the trend of user-centricity where users are not just seen as consumers or a product or service, but are active participants in providing, operation, or even being the application itself. In this paper, the authors will discuss the role of content distribution networks in helping content providers to deliver text, pictures, audio, video, applications and related services to users. The architectural design of a content distribution network is presented and the main future challenges in terms of coordination, content replication, service and policy management are discussed.
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