What is protocol , OSI model , LAN/WAN , TCP/IP

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Accepted Answer

Protocols are rules for communication, OSI model is a framework for understanding how networks operate, LAN/WAN refer to types of networks, TCP/IP is a set of protocols for internet communication.

Protocols are rules that define how data is transmitted and received in a network (e.g. HTTP, FTP, SMTP)
OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers (e.g. application, transport, network)
LAN (Local Area Network) is a network that connects computers and devices in a limited area (e.g. office building), while WAN (Wide Area Network) connects devices over a larger geographical area (e.g. internet)
TCP/IP (Transmission Control Protocol/Internet Protocol) is a set of protocols that governs how data is transmitted over the internet (e.g. TCP ensures data delivery, IP handles addressing)