The "ultra peers" are used mainly for caching results, executing searches and serving as connection points for leaf nodes, which are the nodes that compose the second tier of the file transfer system. This means that stronger nodes assume the role of the "ultra peers", which are nodes that have either been connected to the network long enough, or have enough bandwidth to support many searches and clients at the same time. Limewire, and Gnutella, utilize what is called a two tiered file transfer system. In general, every node would play and equal part in the network as a whole. More specifically, every node that is connected to the network acts as it's own individual server. The main characteristic of a P2P network is that no central server exists. Limewire runs on the Gnutella peer to peer file sharing technology.
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