History Leading to TCP/IP
Today, the world of computer networking uses one networking model: TCP/IP (Transmission Control Protocol/Internet Protocol). However, the world has not always been so simple. Once upon a time, networking protocols didn’t exist, including TCP/IP. Vendors created the first networking protocols; these protocols supported only that vendor’s computers. For example, IBM published its Systems Network Architecture (SNA) networking model in 1974. Other vendors also created their own proprietary networking models. As a result, if your company bought computers from three vendors, network engineers often had to create three different networks based on the networking models created by each company, and then somehow connect those ...
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