![]() However, the OSI 7-layer model is still widely used, as it helps visualize and communicate how networks operate, and helps isolate and troubleshoot networking problems. The modern Internet is not based on OSI, but on the simpler TCP/IP model. It was the first standard model for network communications, adopted by all major computer and telecommunication companies in the early 1980s The Open Systems Interconnection (OSI) model describes seven layers that computer systems use to communicate over a network.
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