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Hierarchy of Dynamic Routing Protocols

	Interior Gateway Protocols				Exterior Gateway Protocols
	Distance Vector		Link-State		Path Vector
IPv4	RIPv2	EIGRP	OSPFv2	IS-IS	BGP-4
IPv6	RIPng	EIGRP for IPv6	OSPFv3	IS-IS for IPv6	BGP-MP

BGP is used to exchange routing information between different organizations, known as autonomous systems (AS)

Interior Gateway Protocols (IGPs) are routing protocols used to exchange routing information within a routing domain administered by a single organization

There is only one EGP and it is BGP

BGP is used by ISPs to route packets over the internet