What is the principle of transferring data from one local network to another?

Question

Computer networks

Hello. The principle of data transfer between local networks is not clear. Suppose you need to transfer data from one network (for example, from Host1) to another (Host2). Those. the route will be Host1 - Switch1 - Router1 - Router2 - Switch2 - Host2. How will the packet be delivered to the recipient (Host2) if the data first arrives through the physical layer to Router2 (i.e., to the Network layer), and then to Switch2 (to the Link layer) and then to Host2, i.e. data moves through the Physical - Network - Channel layers, BUT in the OSI and TCP / IP models, the Link layer comes first, and then the Network layer above it. It turns out that the Network layer header is retrieved first, and then the Link layer, which does not correspond to the two network models. Accordingly, Host1 must first add a Link Layer header, and after Network (if we move down the OSI or TCP / IP model). I hope I have made my question clear.

Answer 1

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