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Network Types Explained – LAN, WAN & MAN (O Level Computer Science 2210 / IGCSE 0478)

What Is a Computer Network?

A computer network is a group of connected computers and devices that can communicate and share resources.

Networks allow devices to:

  • Share files

  • Share printers

  • Access the internet

  • Communicate with other users

Computer networks are essential in schools, businesses and homes.

Types of Computer Networks

Computer networks are classified based on their geographical size and coverage area.

The three main types are:

1️⃣ LAN (Local Area Network)
2️⃣ MAN (Metropolitan Area Network)
3️⃣ WAN (Wide Area Network)

Local Area Network (LAN)

A Local Area Network (LAN) connects computers within a small geographic area.

Examples include:

  • School networks

  • Office networks

  • Home networks

Characteristics of LAN

  • Limited geographical area

  • High data transfer speed

  • Usually privately owned

LANs allow devices to share resources efficiently.

Metropolitan Area Network (MAN)

A Metropolitan Area Network (MAN) connects multiple LANs across a city or large campus.

Examples include:

  • City-wide networks

  • University networks

  • Cable TV networks

Characteristics of MAN

  • Covers larger area than LAN

  • Connects several local networks

  • Used by organisations or service providers

Wide Area Network (WAN)

A Wide Area Network (WAN) connects computers across very large geographical areas, often spanning countries or continents.

The internet is the largest example of a WAN.

Characteristics of WAN

  • Covers very large areas

  • Connects multiple LANs and MANs

  • Uses public communication infrastructure

WANs enable global communication between devices.

Comparison of Network Types

Network TypeCoverage AreaExampleLANSmall area (building or school)School networkMANCity or metropolitan areaCity networkWANLarge geographic areaInternet

Each network type is used depending on the size and communication needs of the organisation.

Advantages of Computer Networks

Computer networks provide several benefits:

✅ Resource sharing
✅ File sharing
✅ Communication between users
✅ Centralized data storage
✅ Internet access

These advantages make networks essential for modern computing environments.

Exam Tip (2210 / 0478)

Students are often asked to:

  • Define LAN

  • Define WAN

  • Compare LAN and WAN

A common exam question is:

Explain one difference between LAN and WAN.

Practice Question

Explain one advantage of a LAN.

Answer

A LAN allows computers in the same location to share resources such as printers and files efficiently.

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