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A P2P network is composed of an unbounded set of peers. Each peer has its own role. Every peer to peer network uses one of the following architectural formats. Centralized Architecture, Decentralized Architecture and Hybrid Architecture. Among these the decentralized architecture does not contain a central server, which purist administrators would consider a "True" peer to peer network. Decentralized architecture further can be divided into structured, unstructured and hybrid p2p networks .In structured p2p overlays a distributed hash table data structure is used in which every data item can be located within a small number of hops at the expense of keeping some state information locally at the nodes.
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