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الملخص EN

The advantage of peer-to-peer (P2P) paradigm relies on two main concepts: cooperation among users and resource sharing.

There are many applications based on peer-to-peer paradigm, but the most popular one is the file sharing.

We can classify the file sharing application into centralized systems, (having a central server), and decentralized systems.

Another classification would be structured and unstructured systems, based on the way of managing the indexing information.

In this paper, we have implemented a centralized peer-to-peer application for file sharing.

Then we evaluated the performance of the system by means of simulation