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Hierarchical routing
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==Background== Most [[Transmission Control Protocol]]/[[Internet Protocol]] ([[Internet protocol suite|TCP/IP]]) routing is based on a two-level hierarchical routing in which an IP [[Network address|address]] is divided into a [[computer network|network]] portion and a [[Server (computing)|host]] portion. Gateways use only the network portion until an IP [[datagram]] reaches a [[Gateway (computer networking)|gateway]] that can deliver it directly. Additional levels of hierarchical routing are introduced by the addition of subnetworks.
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