Networking Concepts: From Zero to Exam‑Ready A clear, no‑fluff guide to core networking concepts, ending with a focused 1‑day study plan. What Is a Network? A computer network is a group of devices that communicate to share data and resources. Communication follows rules called protocols . Real world idea: sending a letter works because both sides agree on address format. Networks work the same way. Types of Networks LAN – small area like home, school, office WAN – large area, the internet is the biggest one MAN – city‑scale network PAN – personal devices like phone ↔ earbuds The OSI Model (Very Important) The OSI model explains how data moves from one device to another. Think of it as a delivery pipeline. Physical – cables, signals Data Link – MAC addresses, switches Network –...
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