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packet switching started in the 1960s and packet switched networks were developed in the late 1960s
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The ARPANET led to the development of internetworking, where multiple separate networks could be joined together into a network of networks.
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The first two nodes of what would become the ARPANET were interconnected between Leonard Kleinrock's Network Measurement Center at the UCLA's School of Engineering and Applied Science and Douglas Engelbart's NLS system at SRI International.
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There were already fifteen sites connected to the ARPANET by the end of 1971.
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In 1982, the Internet was standardized and the concept of a world-wide network of fully interconnected TCP/IP networks called the Internet was introduced.
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The Internet was fully commercialized in the U.S. by 1995 when NSFNET was decommissioned,