A layered architecture. The final innovation was creating an Open Systems Interconnection (OSI) 7-layer model where each layer supports a well defined function. The bottom-most layer (1) or physical layer is where protocols such as “Ethernet” and “Wifi” live while web browsers live in the application layer (7).
Why you should care about Net Neutrality
Rohan Rajiv

Hey! This came up in so many of my IT classes and also the Mac Bible.

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