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| BitTorrent tracker ： ウィキペディア英語版 |
BitTorrent tracker
A BitTorrent tracker is a special type of server, one that assists in the communication between peers using the BitTorrent protocol. In peer-to-peer file sharing a software client on an end-user PC requests a file, and portions of the requested file residing on peer machines are sent to the client, and then reassembled into a full copy of the requested file. The "tracker" server keeps track of where file copies reside on peer machines, which ones are available at time of the client request, and helps coordinate efficient transmission and reassembly of the copied file. Clients that have already begun downloading a file communicate with the tracker periodically to negotiate faster file transfer with new peers, and provide network performance statistics; however, after the initial peer-to-peer file download is started, peer-to-peer communication can continue without the connection to a tracker. Since the creation of the distributed hash table (DHT) method for "Trackerless" torrents, BitTorrent trackers have largely become redundant, however, they are still often included with torrents to improve the speed of peer discovery.
== Trackers and indexers ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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