Ch 5 · Protocols · Theory
Topic 5 of 10 in Networks & Data Transmission — How Machines Talk — 2 lessons.
Agreed Rules
A protocol is a set of rules that lets different devices communicate reliably — like a shared language. Some you must recognise:
Layers
Protocols are organised into layers, each handling one job (e.g. one layer routes, another checks for errors, another displays). Layering keeps the system manageable — a change in one layer doesn't break the others.