Peer-to-peer networks for file sharing

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.

Comparison the effectiveness of (Polder Cast) protocol with (Scribe) protocol in peer-to-peer networks in publishing and subscription systems

Publish/subscribe (pub/sub) is a popular communication paradigm in the design of largescale distributed systems. We are witnessing an increasingly widespread use of pub/sub networks for a wide array of applications in industry , academia , financial data dissemination , business process management and does not end in social networking sites which takes a large area of user interests and used network baseband . Social network interactions have grown exponentially in recent years to the order of billions of notifications generated by millions of users every day. So It has become very important to access in the field of publishing and subscription networks, especially peerto- peer (P2P) networks that used at first the Scribe data routing protocol. Since then, many developments and improvements have been made to create new designs. One of these designs is the Polder Cast protocol. The research studies most used protocols performance to assess the effectiveness of each in terms of the speed of the publication and subscription of topic , required resources and distribution of load .