The OSI reference model was defined in ISO/IEC 7498-1. It is a seven-layer model used in networking, a layered mechanism that describes how information from an application on a network device (e.g., computer, router, etc.) moves from the source to the destination using the physical medium, and then interacts with the software application on that specific network device, as illustrated in Figure 1.1 below:
Figure 1.1 - OSI Reference Model
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