Network protocols and layered architecture

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.

Network protocols

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Key points

A network protocol is a set of rules that defines how devices communicate.

It establishes the format and order of messages, as well as the behavior to follow in case of errors or missing responses.

Protocols ensure interoperability between different systems and software.

To reduce complexity, networks are organized into layers.

Each layer provides services to the layer above it and hides the details of its own operation.

Entities belonging to the same layer on different devices are called peers and ideally communicate using the same protocol.

The complete set of layers and protocols forms the network architecture.

The Internet uses five layers: application, transport, network, link, and physical.

Data travels down through the layers to the physical layer and then moves up through the layers of the receiving device.

febogamedev | July 12, 2026 | 5:50 am

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Network protocols and layered architecture