1980: Design of TCP/IP completed.
1983: Conversion to TCP/IP completed; "gateways" and "routers" allow full
internetworking (ARPANET becomes a "network of networks"). Roughly 500
hosts.
1988: ARPANET becomes NSFNET; regional networks established; backbone
speed 56Kbps. Roughly 100,000 hosts and 200 networks.