The history of the OSI layers dates back to the late 1970s. Two projects independently to achieve the same goal. One of the projects to be started by the International Organization for Standardization (ISO) and the other by the International Telegraph and Telephone Consultative Committee (CCITT). In 1983, these two documents were merged to form a standard called The Basic Reference Model for Open Systems Interconnection. The standard is usually referred to as the OSI model. It was published in 1984 by the International Organization for Standardization and Telecommunications Standardization Sector of the International Telecommunication Union (who was previously named CCITT).
Almost all the layers have separate data units, except for layers seven, six, and five (Application, Presentation, and Session). Layers seven, six, and five all use regular data as their data unit. As other layers have their own unique data unit, such as the Network layer uses packets as a data unit. The Data-Link layer uses frames and the Physical layer uses bits. The Transport layer uses segments. The primary reason behind why layers one, two and three have their own unique data units is because they are the media layers. While layers four, five, six and seven ...
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...t so happen to run into corrupted data. Corrupted data can be bad for more than just not letting the transport layer succeed at its task, but it can just be a waste of space in general. So try to keep your data safe and clean, because if you don’t your data will end up corrupt and many of the seven layers in the OSI model will not function correctly. If all the 7 layers in the OSI model fail I am for one questioning if you have a PC to even test this out, and I am also concerned about you technology cleanliness.
I hope you learned something about the seven layers in the OSI model in this. I know I did not go over all seven of the layers but if you want to know about the other three layers you can do your own research on those layers. It is not the easiest of topics to grasp but you can learn about the topic if you just keep working towards it and try hard to learn
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