Computer Networking (Junior Science Teacher Test Preparation 2026)

Computer Networking

Junior Science Teacher – JST Test Preparation | Computer Section

Introduction

In modern computing, communication between computers has become extremely important. The concept that allows computers to share data and resources is known as Computer Networking. In the Junior Science Teacher (JST) test conducted by SIBA Testing Services, computer networking is an important topic in the Computer section.

Computer networks allow computers and other devices to connect and communicate with each other. Through networking, users can share files, printers, internet connections, and other resources easily.

Today, almost every organization, school, bank, and business depends on computer networks for efficient communication and data sharing. Even the global internet is a huge network connecting millions of computers around the world.

For candidates preparing for the JST examination, understanding computer networking concepts is essential because many MCQs in competitive tests are based on these concepts.

What is Computer Networking?

Computer Networking is the process of connecting two or more computers or electronic devices so that they can communicate and share resources.

Simple Definition

A computer network is a group of interconnected computers that can exchange data and share resources.

Example of a Computer Network

• Computers connected in a school computer lab
• Computers connected in a bank office
• Devices connected to the internet

In these systems, computers communicate through cables or wireless signals.

Components of a Computer Network

A computer network consists of several components that allow communication between devices.

1. Nodes

Nodes are the devices connected to the network.

• Computers
• Printers
• Servers
• Smartphones

Each device connected to the network is called a node.

2. Network Interface Card (NIC)

A Network Interface Card (NIC) is a hardware component that allows a computer to connect to a network.

Every computer must have a NIC to communicate with other devices.

3. Transmission Media

Transmission media refers to the communication channels used to transfer data between devices.

There are two main types of transmission media:

Wired Media

• Twisted pair cables
• Coaxial cables
• Fiber optic cables

These cables physically connect computers in a network.

Wireless Media

Wireless communication uses radio signals instead of cables.

• Wi-Fi networks
• Bluetooth connections

Wireless networks are commonly used in homes, schools, and offices.

4. Network Devices

Network devices help connect and manage network communication.

Hub

A hub connects multiple devices in a network and sends data to all connected devices.

Switch

A switch is more advanced than a hub because it sends data only to the intended device.

Router

A router connects different networks and allows devices to access the internet.

Types of Computer Networks

1. Local Area Network (LAN)

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

Examples

• School computer labs
• Office networks
• Home networks

LAN networks are usually fast and inexpensive.

2. Metropolitan Area Network (MAN)

A Metropolitan Area Network (MAN) covers a larger area than LAN but smaller than WAN.

It usually connects networks within a city.

Example: City-wide internet networks.

3. Wide Area Network (WAN)

A Wide Area Network (WAN) covers a very large geographical area such as a country or continent.

The largest example of a WAN is the Internet, which connects millions of computers worldwide.

Network Topologies

Network topology refers to the physical arrangement of computers in a network.

1. Bus Topology

In bus topology, all computers are connected to a single communication cable.

Advantages

• Simple structure
• Low cost

Disadvantages

• If the main cable fails, the entire network stops working.

2. Star Topology

In star topology, all devices are connected to a central device such as a hub or switch.

Advantages

• Easy to manage
• Failure of one device does not affect others

Disadvantages

• If the central hub fails, the network stops working.

3. Ring Topology

In ring topology, each computer is connected to two other computers forming a circular network.

Data travels in one direction around the ring.

4. Mesh Topology

In mesh topology, every device is connected to multiple other devices.

This topology provides high reliability but is expensive.

Advantages of Computer Networking

• Resource Sharing – Users can share printers, storage devices, and internet connections.
• Data Sharing – Files and information can be shared easily.
• Communication – Networks enable email, messaging, and video conferencing.
• Cost Efficiency – Sharing resources reduces equipment costs.

Disadvantages of Computer Networking

• Security Risks – Networks may be vulnerable to hacking.
• Network Failure – If the network fails, communication stops.
• Maintenance Cost – Large networks require technical maintenance.

Importance of Networking in Education

Computer networking plays an important role in education. Educational institutions use networks for:

• Online learning platforms
• Sharing educational resources
• Communication between teachers and students
• Internet access for research

Networking allows students and teachers to collaborate and share knowledge easily.

Importance of Networking in Modern Life

• Banking systems
• Business communication
• Government services
• Healthcare systems
• Online education

Without computer networks, modern digital communication would not be possible.

Important Points for JST Test

• A computer network connects multiple devices for communication.
• LAN covers a small geographical area.
• WAN covers a large geographical area.
• The internet is the largest WAN.
• Network devices include hubs, switches, and routers.
• Network topology refers to the layout of a network.

Expected MCQs for JST Test

MCQ 1
Computer networking refers to:
a) Connecting computers to share data
b) Repairing computers
c) Manufacturing computers
Answer: Connecting computers to share data

MCQ 2
Which device connects networks and provides internet access?
a) Router
b) Monitor
c) Printer
Answer: Router

MCQ 3
LAN stands for:
a) Large Area Network
b) Local Area Network
c) Long Area Network
Answer: Local Area Network

MCQ 4
The largest computer network in the world is:
a) LAN
b) Internet
c) MAN
Answer: Internet

MCQ 5
Which topology uses a central hub?
a) Star topology
b) Bus topology
c) Ring topology
Answer: Star topology

MCQ 6
Which device connects computers in a network?
a) Router
b) NIC
c) Printer
Answer: NIC

MCQ 7
MAN stands for:
a) Metropolitan Area Network
b) Main Area Network
c) Multiple Area Network
Answer: Metropolitan Area Network

Conclusion

Computer networking has become a fundamental part of modern technology. By connecting computers and devices, networks allow people to share information, resources, and communication services efficiently.

From small office networks to global systems like the internet, networking technology plays a crucial role in education, business, government, and everyday life.

For candidates preparing for the Junior Science Teacher examination, understanding computer networking concepts is essential because these topics frequently appear in competitive exams and provide a foundation for understanding modern digital communication systems.