Ethernet Video Series


Episode 08, Segment 03 of 05

The 7-Layer Vocabulary of Modern Internetworking

ISO / OSI Reference Model (continued)

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Back in the early days of computer networking (in the 1970ís) computer networks were created in a proprietary fashion by a lot of different companies that used competing specifications, and they could not interoperate with each other at any level. Back in those days, if you bought your computers from IBM, you also bought your network from IBM. And your IBM computers really could not speak very effectively with computers from DEC, or Data General, or Hewlett Packard, etc. Attempts to make these competing network types interoperate sensibly resulted in a lot of frustration. Eventually, it became clear that these proprietary network systems would have to be abandoned, and would eventually be replaced by new network architectures built along an interoperable design.

Episode 08, Segment 04 of 05