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Routing involves 2 activities
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optimal path determination ( complex issue)
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transport of packets through network (relatively straightforward)
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BGP performs inter-domain routing in TCP/IP networks
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BGP is an exterior gateway protocol (performs routing between multiple autonomous systems or domains and exchanges routing information with other BGP systems)
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BGP was developed to replace its predecessor: EGP (Exterior Gateway Protocol - a particular instance if an exterior gateway protocol)
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RFC 1771, 1654 (obsolete 1105, 1163, 1267)
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autonomous system (routing domain) - portion of inter-network under common administrative authority
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