Networking basics

Four lessons with no technical background: what a network and its devices are, the layers that organise how devices talk, the cables that carry the signal, and the addresses each device is known by.

OverviewFour lessons with no technical background: what a network and its devices are, the layers that organise how devices talk, the cables that carry the signal, and the addresses each device is known by.
What is a network? Devices, kinds and measuresFrom zero: devices connected and exchanging data by agreed rules. You meet the kinds and shapes of networks, their devices, and the difference between speed and delay.
Layers: the OSI and TCP/IP models and encapsulationWhy communication is split into layers, what each of the seven does, and how your message is wrapped in headers going down and unwrapped going up. You try it yourself in the layer explorer and the packet builder.