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Can refer a detailed low level explaination of the OSI model at operating system level?

There is no specific "operating system level" in the OSI model. Most commonly, layers 3 and 4 are covered by the OS, but that may vary: functions are offloaded to the NIC (traditionally ...
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HTTP and TCP relationship

TCP creates a bilateral, serial path between the endpoints. All segmentation, packetization, windowing etc is hidden and abstracted away. That way, HTTP or any other application protocol using TCP ...
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Why in the TCP/IP model the link & physical are one?

The internet was a project to connect disparate networks into a coherent whole. It was neither necessary nor desirable for the architects of the internet to worry about how exactly those underlying ...
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