The complex problem of routing on large networks can be simplified by breaking a network into a hierarchy of smaller networks, where each level is responsible for its own routing. The Internet has, basically, three levels: the backbones, the mid-levels, and the stub networks. The backbones know how to route between the mid-levels, the mid-levels know how to route between the sites, and each site (being an autonomous system) knows how to route internally. See also Exterior Gateway Protocol, Interior Gateway Protocol, transit network.

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[ al ] [ an ] [ ar ] [ arc ] [ arg ] [ as ] [ at ] [ au ] [ b ] [ ba ] [ backbone ] [ be ] [ bo ] [ bon ] [ br ] [ break ] [ by ] [ ca ] [ ch ] [ ck ] [ co ] [ com ] [ E ] [ ed ] [ ee ] [ er ] [ era ] [ es ] [ et ] [ Exterior Gateway Protocol ] [ fi ] [ fo ] [ for ] [ G ] [ ge ] [ h ] [ hierarchy ] [ hr ] [ id ] [ ie ] [ in ] [ int ] [ Interior Gateway Protocol ] [ Internet ] [ io ] [ is ] [ it ] [ ki ] [ kn ] [ la ] [ li ] [ ls ] [ ly ] [ ma ] [ mall ] [ mo ] [ mp ] [ na ] [ ne ] [ net ] [ network ] [ ng ] [ no ] [ ns ] [ om ] [ pl ] [ pr ] [ rc ] [ re ] [ ro ] [ route ] [ routing ] [ S ] [ si ] [ sit ] [ sm ] [ so ] [ st ] [ stub ] [ stub network ] [ sy ] [ system ] [ T ] [ th ] [ to ] [ tr ] [ transit network ] [ tw ] [ us ] [ ve ] [ ws ]