OSI

In 1984, after years of having separate thoughts on networking standards, the International Organization for Standardization (ISO) and the International Telegraph and Telephone Consultative Committee (CCITT) jointly published the Open Systems Interconnection Reference Model, more commonly known as the OSI model. In the more than three decades that have passed since its inception, the OSI model has given millions of technologists a frame of reference to work from when discussing networking, which has worked out pretty well for Cisco.