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Examples Peer-to-Peer Applications

Examples Peer-to-Peer Applications (Gnutella, Kazaa, BitTorrent, Skype) Second generation approach Gnutella Fully distributed approach Constructs Gnutella overlay network What is an overlay network? How do we join the network? Query flooding Performance limitations? Easy to read specification Gnutella: protocol Query QueryHit Query QueryHit File transfer: HTTP Query message sent over existing TCP connections peers forward Query message QueryHit sent over reverse path Scalability: limited scope flooding Kazaa: Not all peers are equal Basic idea Peers and group leaders TCP connection between peer and its group leader TCP connections between some pairs of group leaders Group leader tracks the content in all its children Speed ups Limitations on simultaneous uploads Request queuing Incentive priorities Par

Query message sent over existing TCP connections peers forward Query message QueryHit sent over reverse path Scalability: limited scope flooding . ... Existing Leach Seed Peer Peer initiating a new download Web Server Tracker Download Arctic_Monkeys-7-cSm-2.torrent Fragment 5 Joining a torrent

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