Mid 1960 : Papers on “Packet Switching” emerge. End 1969s: ARPA sponsors the development of a packet-switching network, called the ARPANET. 1974: The TCP/IP protocols and model are being p roposed by Cerf/Kahn. 1980: IPv4 is introduced 1983: ARPANET adopts TCP/IP. At this time, the ARPANET has 200 routers. 1984: NSF funds a TCP/IP based backbone network. This backbone grows into the NSFNET, which becomes the successor of the ARPANET. 1995: NSF stops funding of NSFNET. The Internet is completely commercial.
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