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In page Gnutella:

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To address the problems of bottlenecks, Gnutella developers implemented a tiered system of ultrapeers and leaves. Instead of all nodes being considered equal, nodes entering the network were kept at the 'edge' of the network, as a leaf. Leaves don't provide routing. Nodes which are capable of routing messages are promoted to ultrapeers. Ultrapeers accept leaf connections and route searches and network maintenance messages. This allows searches to propagate further through the network and allows for numerous alterations in topology. This greatly improved efficiency and scalability.[citation needed]