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What is the purpose of the OSI model and how does it partition the flow of data?
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[QUOTE="PainterGuy, post: 6644126, member: 311618"] Source: [URL]https://en.wikipedia.org/wiki/OSI_model[/URL] [ATTACH type="full" width="920px" alt="1655712121134.png"]303080[/ATTACH] Source: [URL]https://en.wikipedia.org/wiki/OSI_model#Layer_architecture[/URL] It is said above that the model partitions the flow of data into sever abstraction layers. The following is my own understanding of OSI model as a layman. For a sender, the data flow starts at Application Layer. Each layer is like room where particular operations and actions are performed on data. Each room performs its operations on data using a physical circuitry. In Application Layer room, data is generated. In the next step, the generated data enters Presentation Layer room where some operations are performed on the previously generated data. In the third step, the data enters Session Layer room. I don't think any operation is done on the data itself. But the presence of data signals the establishment or termination of connection among other things between the sender and receiver. The circuitry at this layer is directly connected to the physical layer. Please see the figure below. Continuous session related data exchange (such as initiation of connection, termination of connection etc.) takes place between sender and receiver via direct connection between Session Layer and Physical Layer. It's as if Session Layer is directly connected to the Physical Layer. Please note that I think of Physical Layer as a real wire connection. [ATTACH type="full" alt="1655714057667.png"]303083[/ATTACH] Then the data enters Transport Layers which performs different operations on data using its circuitry. After passing through Network Layer and Data Link Layer, the data enters Physical Layer which functions as an exit for the outgoing data. To me the model is like a food recipe where each ingredient should be added at the right stage in the preparation of time. There is a reason Transport Layer is at number 4 and not at number 5. Could you please let me know if my understanding is okay?[B]Helpful links:[/B] 1: [URL]https://www.quora.com/What-are-the-differences-between-logical-connection-and-physical-connection[/URL] 2: /watch?v=qYM4xkeLunY (add [URL='http://www.youtube.com']www.youtube.com[/URL] in front) 3: /watch?v=nFnLPGk8WjA (add [URL='http://www.youtube.com']www.youtube.com[/URL] in front) 4: /watch?v=kCuyS7ihr_E (add [URL='http://www.youtube.com']www.youtube.com[/URL] in front) [/QUOTE]
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What is the purpose of the OSI model and how does it partition the flow of data?
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