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Abstract-Peer-to-peer (P2P) systems in general, and BitTorrent (BT) specifically, have been of significant interest to researchers and Internet users alike. Existing models of BT abstract away certain characteristics of the protocol that are important, which we address in this work. We present a simple yet accurate and easily extensible model of BT. The model's accuracy is validated through a rigorous simulation-based study and its extensibility is illustrated by incorporating recently proposed approaches to protocol changes in BT.

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