In 1976, Cerf accepted the position offered by DARPA to serve as program manager. He later became a principal scientist of the agency. At DARPA, he continued working with Khan on networking and TCP/IP protocols. They demonstrated how the internet works through the ARPANET, Packet Radio net and SATNET. They sent messages from a van in the bay area across the United States on ARPANET to the University College of London and back via satellite to Virginia through the ARPANET located at the University of Southern California’s Information Sciences Institute to prove the viability of the TCP/IP protocol to connect networks worldwide. In 1983, the TCP/IP protocol became the standard protocol for the ARPANET, which became the internet. During his tenure at the agency from 1976 to 1982, Cerf indeed played a key role leading the development of the internet including internet related data packet and security technologies. <ref>[http://www.computerhistory.org/internet_history/internet_history_70s.html Computer History Museum]</ref> <ref>[http://web.mit.edu/invent/iow/cerf.htm Vinton Cerf TCP/IP Protocol]</ref> | In 1976, Cerf accepted the position offered by DARPA to serve as program manager. He later became a principal scientist of the agency. At DARPA, he continued working with Khan on networking and TCP/IP protocols. They demonstrated how the internet works through the ARPANET, Packet Radio net and SATNET. They sent messages from a van in the bay area across the United States on ARPANET to the University College of London and back via satellite to Virginia through the ARPANET located at the University of Southern California’s Information Sciences Institute to prove the viability of the TCP/IP protocol to connect networks worldwide. In 1983, the TCP/IP protocol became the standard protocol for the ARPANET, which became the internet. During his tenure at the agency from 1976 to 1982, Cerf indeed played a key role leading the development of the internet including internet related data packet and security technologies. <ref>[http://www.computerhistory.org/internet_history/internet_history_70s.html Computer History Museum]</ref> <ref>[http://web.mit.edu/invent/iow/cerf.htm Vinton Cerf TCP/IP Protocol]</ref> |