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All forecasts of Internet traffic point at a substantial growth over the next few years. From a network operator perspective, efficient in-network caching of data is and will be a key component in trying to cope with and pro t from this increasing demand. One problem, however, is to evaluate the performance of different caching policies as the number of available data items as well as the distribution networks grows very large. In this paper, the authors develop an analytical model of an aggregation access network receiving a continuous flow of requests from external clients. They provide exact analytical solutions for cache hit rates, data availability and more. This enables them to provide guidelines and rules of thumb for operators and information-centric network designers.
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