What is a Computer Network?
A computer network is a collection of interconnected devices that communicate and exchange data.
Simple Idea 💡
When two or more digital devices are connected so that information can travel between them, they form a network.
Data
Why Do We Need Networks?
Resource Sharing
Devices can share files, printers, storage and other resources.
Communication
Networks enable email, messaging, video calls and online collaboration.
Information Access
Networks connect users to information and services available across the world.
Shared Services
Cloud computing allows users to access computing resources through networks.
How Does Data Communication Work?
Data communication requires important elements working together.
Sender
The device that sends information.
Medium
The path through which data travels.
Receiver
The device that receives information.
When you send a WhatsApp message, your smartphone acts as the sender. The network carries the data, and the recipient's device receives it.
Basic Network Components
Networks by Geographic Coverage
PAN
Personal Area Network
A very small network around an individual, such as Bluetooth-connected devices.
LAN
Local Area Network
Covers a limited area such as a classroom, office, school or building.
MAN
Metropolitan Area Network
Covers a larger geographic area such as a city.
WAN
Wide Area Network
Covers very large geographical areas. The Internet is the most famous example.
What is a Protocol?
A protocol is a set of rules that devices follow to communicate with one another.
Real-World Analogy 🤝
If two people do not understand the same language or communication rules, meaningful communication becomes difficult. Network devices also need agreed rules.
Mini Data Transfer Simulator
Click the button and watch a data packet travel from the sender to the receiver.
Sender
Receiver
Ready to transmit.
HOTS Challenge 🧠
A school wants to connect 30 computers, a printer and a server within one computer laboratory. Which type of network is most appropriate?
My HOTS Reflection
"A network is not just a collection of connected computers. It is a system that allows information, resources and services to move beyond the boundaries of a single device."
Deliverable: Interactive Network Foundations Explorer
Study: Networking Lecture 01 — Introduction