Computer networks: meaning, types, network devices, and uses. Computer networks are a core topic in SHS ICT because they explain how computers communicate and share resources. This topic also forms the foundation for understanding the internet, cloud services, and modern digital communication.
Meaning of a Computer Network
A computer network is a group of two or more computers and digital devices connected together so they can share data, hardware resources, and software. The connection may be through cables or wireless signals such as Wi-Fi.
In a school computer lab, all the computers connected to one another form a network. When students print from different computers using one printer, a network is at work.
Types of Computer Networks
Computer networks are classified based on size and coverage area.
Local Area Network (LAN): A LAN connects computers within a small area such as a classroom, office, school, or home. LANs are fast and commonly use Ethernet cables or Wi-Fi. Most school computer labs operate using a LAN.
Metropolitan Area Network (MAN): A MAN covers a larger area such as a town or city. It connects several LANs together. Internet service providers often use MANs to supply internet access across cities.
Wide Area Network (WAN): A WAN covers very large areas such as countries or continents. The internet is the best example of a WAN. WANs use satellites, fibre optic cables, and undersea cables for communication.
Common network devices and their functions
Computer networks rely on special hardware devices.
Router: A router connects different networks together and directs data to the correct destination. It is the device that allows computers to access the internet.
Switch: A switch connects multiple computers within a LAN and manages data traffic between them efficiently.
Modem: A modem converts digital signals from a computer into signals suitable for transmission over telephone lines or fibre networks, and vice versa.
Network Interface Card (NIC): A NIC allows a computer to connect to a network. It may be wired or wireless.
Uses of computer networks
Resource sharing: Networks allow users to share printers, scanners, storage devices, and internet connections.
Communication: Email, instant messaging, and video calls all depend on computer networks.
Data sharing: Files and information can be shared quickly between users on a network.
Centralized control: Schools and organizations can manage data, software, and security from a central system.
Advantages of computer networks
- Faster communication
- Reduced cost through shared resources
- Easy access to information
- Improved collaboration
Disadvantages of computer networks
- Spread of computer viruses
- Security risks such as hacking
- High setup and maintenance cost
- Network failure can disrupt work
Computer networks: meaning, types, network devices, and uses.
