This lesson introduces the concepts of network protocols and layered architecture, explaining them as a set of rules that enables different devices and software to communicate effectively.
The text illustrates how protocols define message formats, the order of exchange, error handling, and interoperability between different systems. It then explains the organization of networks into layers, where each layer provides services to the layer above it and communicates with the corresponding layer on the other device.
The lesson also presents the Internet’s layered architecture—application, transport, network, link, and physical—and introduces the concept of encapsulation: the process by which each layer adds its own header to the data received from the layer above.
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