The Evolution of TCPIP and The Internet

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The Evolution of TCPIP and The Internet

The Evolution of TCP/IP (and the Internet)

While the TCP/IP protocols and the Internet are different, their evolution are most definitely parallel. This section will discuss some of the history.

Prior to the 1960s, what little computer communication existed comprised simple text and binary data, carried by the most common telecommunications network technology of the day; namely, circuit switching, the technology of the telephone networks for nearly a hundred years. Because most data traffic transmissions occur during a very short period of time, circuit switching results in highly inefficient use of network resources. In 1962, Paul Baran, of the Rand Corporation, described a robust, efficient, store-and-forward data network in a report for the U.S. Air Force; Donald Davies suggested a similar idea in independent work for the Postal Service in the U.K., and coined the term packet for the data units that would be carried. According to Baran and Davies, packet switching networks could be designed so that all components operated independently, eliminating single point-of-failure problems. In addition, network communication resources appear to be dedicated to individual users but, in fact, statistical multiplexing and an upper limit on the size of a transmitted entity result in fast, economical data networks.

The modern Internet began as a U.S. Department of Defense (DoD) funded experiment to interconnect DoD-funded research sites in the U.S. In December 1968, the Advanced Research Projects Agency (ARPA) awarded a contract to design and deploy a packet switching network to Bolt Beranek and Newman (BBN). In September 1969, the first node of the ARPANET was installed at UCLA. With four n...

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...number of observations are in order. First, the ISO Development Environment (ISODE) was developed in 1990 to provide an approach for OSI migration for the DoD. ISODE software allows OSI applications to operate over TCP/IP. During this same period, the Internet and OSI communities started to work together to bring about the best of both worlds as many TCP and IP features started to migrate into OSI protocols, particularly the OSI Transport Protocol class 4 (TP4) and the Connectionless Network Layer Protocol (CLNP), respectively. Finally, a report from the National Institute for Standards and Technology (NIST) in 1994 suggested that GOSIP should incorporate TCP/IP and drop the "OSI-only" requirement. [NOTE: Some industry observers have pointed out that OSI represents the ultimate example of a sliding window; OSI protocols have been "two years away" since about 1986.]

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