Components of a Computer Network - JSS 2

COMPONENTS OF A COMPUTER NETWORK

SUBJECT	Digital Technologies
CLASS	JSS 2 (Basic 8)
TERM	First Term
WEEK	3
TOPIC	Components of a Computer Network
SUBTOPICS	Servers, clients, switches, routers, hubs; network media: cables and wireless
DURATION	80 Minutes (Double Period)

INTRODUCTION

A computer network is made up of different devices and communication media that work together to allow computers and other digital devices to communicate and share resources.

In the previous lesson, we learnt what a computer network is and why computers are connected together. In this lesson, we will study the major components that make up a computer network and learn the functions of each component.

MEANING OF COMPUTER NETWORK COMPONENTS

Computer network components are the hardware devices, computers and communication media that are used to create, connect and operate a computer network.

Examples include servers, client computers, switches, routers, hubs, network cables and wireless communication devices.

1. SERVER

Definition: A server is a computer or system that provides services, resources or information to other computers and devices on a network.

A server is designed to manage and provide shared resources to other computers called clients. For example, a server may store files that users on a network are allowed to access.

Functions of a Server

Stores and manages files and data.
Provides services to computers on the network.
Manages access to shared resources.
May manage user accounts and permissions.
Can provide websites, email or other network services.

Examples of servers include file servers, web servers, email servers and database servers.

2. CLIENT COMPUTER

Definition: A client is a computer or device that requests or uses services and resources provided by a server or another network device.

For example, when students use computers in a school computer laboratory to access files stored on a school server, those computers are acting as clients.

Examples of Client Devices

Desktop computers
Laptops
Tablets
Smartphones
Other network-connected devices

3. NETWORK SWITCH

Definition: A network switch is a device used to connect multiple devices within the same computer network.

A switch receives data from one device and forwards it to the appropriate device on the network. It helps devices such as computers, printers and servers communicate with one another.

Functions of a Switch

Connects several devices on a network.
Allows connected devices to communicate.
Forwards data to the appropriate connected device.
Helps organize communication within a local network.

Example: In a school computer laboratory, a switch can connect several computers so that they can communicate and share network resources.

4. ROUTER

Definition: A router is a network device that connects different networks and directs data between them.

A common example is a router used in a home, school or office to connect the local network to the Internet.

Functions of a Router

Connects different networks.
Directs data between networks.
Can connect a local network to the Internet.
Can provide wireless network access on many home and office networks.
Helps determine where network data should be sent.

5. NETWORK HUB

Definition: A hub is a networking device that connects multiple devices and sends incoming data to all connected ports.

Hubs were commonly used in older Ethernet networks. Unlike a switch, a traditional hub does not normally determine which specific connected device should receive the data. Instead, it sends the data to all connected ports.

Function of a Hub

Connects several network devices.
Allows connected devices to communicate.
Receives data from one port and sends it through the other connected ports.

Note: Switches are generally preferred over traditional hubs because switches can forward data more selectively and efficiently.

6. NETWORK MEDIA

Network media refers to the means through which data travels from one network device to another.

Network media can be divided into two major categories: wired media and wireless media.

7. WIRED NETWORK MEDIA

Wired network media uses physical cables to carry data between devices.

Examples of Wired Media

Ethernet cables
Twisted-pair cables
Fibre-optic cables

Advantages of Wired Networks

They can provide reliable connections.
They can provide high-speed communication.
They are less affected by some forms of wireless interference.
They can be suitable for fixed computers and network equipment.

Disadvantages of Wired Networks

Cables can make installation more difficult.
Users may have limited mobility.
Large networks may require many cables.

8. WIRELESS NETWORK MEDIA

Wireless networking allows devices to communicate without a physical network cable between them. It commonly uses radio signals to transmit data.

Examples of Wireless Connections

Wi-Fi
Bluetooth
Mobile network connections

Advantages of Wireless Networks

Devices can connect without physical network cables.
Users can move around within the network's coverage area.
They can be easier to install in some situations.
Many devices can connect wirelessly.

Disadvantages of Wireless Networks

Signals can be affected by distance and physical obstacles.
Wireless networks require proper security configuration.
Performance can vary depending on signal strength and network conditions.

WIRED AND WIRELESS NETWORKS

Feature	Wired Network	Wireless Network
Connection	Uses physical cables.	Uses wireless signals.
Mobility	Usually provides less mobility.	Allows greater mobility.
Installation	Requires physical cabling.	Can be easier to install where cabling is difficult.
Examples	Ethernet and fibre-optic connections.	Wi-Fi and Bluetooth.

MAJOR NETWORK COMPONENTS AT A GLANCE

Component	Main Function
Server	Provides services and resources to other network devices.
Client	Uses or requests services and resources on a network.
Switch	Connects devices within a network and forwards data to the appropriate device.
Router	Connects different networks and directs data between them.
Hub	Connects devices and broadcasts incoming data to connected ports.
Network Cable	Provides a physical path for data transmission.
Wireless Connection	Allows devices to communicate using wireless signals.

IMPORTANCE OF NETWORK COMPONENTS

Network components are important because they make communication and resource sharing possible. Without appropriate network devices and media, computers and other digital devices would not be able to communicate effectively across a network.

They help users to:

Share files and information.
Share printers and other hardware resources.
Access the Internet.
Communicate with other users.
Access shared applications and services.
Connect different devices together.

CLASS ACTIVITY

Study the following network components and state their functions:

Server
Client computer
Switch
Router
Hub
Network cable
Wireless connection

Students should also identify which of the listed network media is wired and which is wireless.

SUMMARY

A computer network consists of different devices and communication media that work together to allow computers and other digital devices to communicate.

Important network components include servers, clients, switches, routers and hubs. Network media can be wired, using cables, or wireless, using signals such as Wi-Fi.

Understanding the function of each network component helps users understand how computers communicate and share resources within a network.

EVALUATION

What is a computer network component?
Define a server.
What is the function of a client computer?
State three functions of a network switch.
What is a router?
What is a network hub?
State two differences between a switch and a hub.
What is network media?
State three examples of wired network media.
State three examples of wireless connections.
Give two advantages of wireless networks.
Differentiate between wired and wireless networks.

ASSIGNMENT

Draw a simple computer network containing a server, two client computers, a switch, a router and the Internet. Label each component and state its function.

Search This Blog

cmpnote blog