Lesson 6.1: Basics of Networks (LAN, WAN, Topologies)
A computer network is a group of two or more computers connected together to share data, devices (like printers), and internet access.
🌐 1. Types of Networks
🔹 LAN (Local Area Network):
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Connects computers in a small area like a home, school, or office
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Fast and cost-effective
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Example: Computers connected in a computer lab
🔹 WAN (Wide Area Network):
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Covers large geographical areas (cities or countries)
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Uses telephone lines, satellites, or the internet
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Example: Internet itself is a WAN
🔹 MAN (Metropolitan Area Network):
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Covers a large city or campus
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Bigger than LAN but smaller than WAN
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Example: Network across all bank branches in one city
🧩 2. Common Network Devices
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Router: Connects different networks; helps access internet
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Modem: Converts digital signals for internet connection
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Switch: Connects multiple computers in LAN
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Network Cable: Connects devices physically
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Wi-Fi Adapter: Enables wireless connection
🔄 3. Network Topologies
A topology is the structure or layout of a computer network.
🟠 Bus Topology:
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All devices connected to a single cable
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Cheap but not very reliable
🟢 Star Topology:
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All devices connected to a central switch or hub
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Most commonly used today
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Easy to manage and troubleshoot
🔵 Ring Topology:
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Devices connected in a circular loop
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Less common, slower than star
Computer networks allow sharing of data and resources efficiently. Understanding network types and structures helps in using the internet effectively.
