Clients can opportunistically connect with any other client to obtain multiple parts of the file at once. But once the downloading begins, something magical happens: as clients download the file, they share whatever parts of the file they have with each other. With BitTorrent, you also start by placing your large file on a central server. The larger the file, the larger the audience, the worse your bandwidth problem gets. You probably don't have enough bandwidth to serve a large file to a large audience, and even if you did, your bandwidth bill would go through the roof. ![]() For every download, the server consumes bandwidth equal to the size of the file. It's a gratifyingly simple approach, but it doesn't scale. Each client then downloads the file directly from the server. The traditional method of distributing large files is to put them on a central server.
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