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1971 is the year that the first appearance of electronic mail takes place, with the sending of the first 'email'. It was the American engineer Roy Tomlinson who unknowingly invented one of the most popular forms of communication today.
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The CYCLADES network was the first to make hosts responsible for reliable data delivery, rather than a centralized service of the network itself. The datagrams were exchanged on the network using transport protocols that do not guarantee reliable delivery, but only try plus-effort
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The new protocol was implemented as the Transmission Control Program, the first part of TCP/IP and was published in 1974. At the start, TCP handled both datagram transmission and routing, but as the protocol expanded, other researchers started to recommend that these two functions be split into layers
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On December 5, 1969, the first ARPANET interconnection was established between nodes located at the University of California at Los Angeles, the Stanford Research Institute, the University of California at Santa Barbara, and the University of Utah.