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  proposed 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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