Lesson 6.1: Basics of Networks (LAN, WAN, Topologies)
In this lesson, you’ll learn what computer networks are, their types, and how they are structured.
🌐 What is a Network?
A computer network is a group of computers and devices connected together to share data, resources, and communicate.
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Example: When computers in an office share a printer and internet connection, they are part of a network.
🧱 Types of Networks
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LAN (Local Area Network)
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Covers a small area like a home, office, or school.
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High-speed and inexpensive.
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Example: All computers connected within a small office building.
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WAN (Wide Area Network)
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Covers a large geographical area, like cities or countries.
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Uses public networks (like telephone lines or satellite).
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Example: The Internet is the largest WAN.
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MAN (Metropolitan Area Network)
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Covers a city or a large campus.
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Larger than LAN but smaller than WAN.
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🔁 Network Topologies (Structure of Connection)
Topology refers to the physical or logical layout of a network.
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Bus Topology
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All devices are connected to a single cable (backbone).
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Easy to install but not reliable.
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Star Topology
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All devices connect to a central hub or switch.
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Easy to manage and reliable.
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Ring Topology
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Each device connects to two others, forming a circle.
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Data travels in one direction (or both in dual ring).
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Mesh Topology
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Devices are interconnected with many redundant connections.
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High reliability and speed, but expensive.
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🎯 Real-Life Example:
In a cyber café:
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All computers are connected via LAN.
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If they are arranged in a star pattern using a switch, that is star topology.
📝 Practice Questions:
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What is the difference between LAN and WAN?
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Explain star topology in your own words.
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Give two real-life examples of where LAN is used.
