DIGI Units Notes

 

Computer Network

Introduction

A computer network is a
way to connect computers to share information and resources like files, printers, or the internet. For example, the computers in your school’s computer lab might be connected to share a printer.

Types of Computer Networks

1. LAN (Local Area Network): Covers a small area, like a school or home.
• Example: Computers in a classroom.
2. WAN (Wide Area Network): Covers large distances, like the internet.
3. MAN (Metropolitan Area Network): Connects computers in a city.

Why Are Networks Useful?

• Sharing Resources: Many computers can use one printer.
• Communication: Send messages or emails easily.
• Internet Access: Connect to the world wide web.

How Do Networks Work?

Networks use devices like:

• Routers: Send data between networks.
• Switches: Connect devices within a network.
• Cables/Wi-Fi: Carry information between computers.

Conclusion

Computer networks connect computers to share resources and make communication easier. They are everywhere—at school, home, and work.

 

 

 

 

 

Network Cables and Connectors

Introduction

Network cables and connectors are the tools that help computers and devices communicate within a network. They act like roads and bridges for data to travel.

Types of Network Cables

1.      Ethernet Cables: The most common cables used to connect computers to routers or switches. They come in types like Cat5, Cat5e, and Cat6.

o   Example: The cable that connects your computer to the internet router at home.

2.      Fiber Optic Cables: These use light to send data and are much faster than Ethernet cables.

o   Example: Used by internet service providers for high-speed internet.

Types of Connectors

1.      RJ45 Connector: Used for Ethernet cables. It looks like a bigger phone plug.

2.      Fiber Optic Connectors: Special connectors for fiber optic cables to carry light signals.

Importance of Cables and Connectors

·        They ensure reliable and fast communication between devices.

·        Different cables are used for different needs (e.g., speed, distance).

Conclusion

Network cables and connectors are essential for building and maintaining computer networks. They make it possible for devices to share data quickly and efficiently.

 

 

 

 

 

 

 

 

 

Network Safety

Introduction

Network safety refers to the steps we take to protect computers and data from being accessed or damaged by unauthorized users. It is like locking the doors and windows of your house to keep it safe.

Why Is Network Safety Important?

·        Protect Data: Keeps important information safe from hackers.

·        Prevent Viruses: Stops harmful programs from damaging devices.

·        Secure Communication: Ensures private messages stay private.

Simple Network Safety Tips

1.      Use Strong Passwords: Create passwords that are hard to guess.

o   Example: A strong password has letters, numbers, and symbols.

2.      Install Antivirus Software: Protects against viruses and malware.

3.      Don’t Share Personal Information: Be careful when chatting or sharing files online.

4.      Update Software Regularly: Keeps your computer safe from new threats.

Example of Safety

Imagine a school network where students can only access their own files and not others. This is possible because of good network safety practices.

Conclusion

Network safety is crucial to protect devices and data from harm. By following simple steps, we can keep our computers and networks safe.

 

 

 

 

 

 

 

 

Wireless Connecting (1, 2, 3)

Introduction

Wireless connections make it possible to connect devices without using cables. Devices communicate through signals like Wi-Fi, Bluetooth, or infrared.

Types of Wireless Connections

1.      Wi-Fi:

o   Allows devices like computers, phones, and tablets to connect to the internet or each other.

o   Example: Connecting your laptop to your home Wi-Fi.

2.      Bluetooth:

o   Used for short-range communication between devices like headphones, speakers, and smartphones.

o   Example: Pairing your wireless earbuds to your phone.

3.      Infrared:

o   Used for very short distances, like remote controls.

o   Example: Changing channels on your TV using a remote.

How Wireless Connections Work

·        Wi-Fi: Uses radio waves to transmit data over a network.

·        Bluetooth: Uses low-power radio waves for direct communication.

·        Infrared: Sends data using light signals that cannot be seen by the naked eye.

Why Use Wireless Connections?

·        Convenience: No need for cables, making devices portable.

·        Flexibility: Connect multiple devices easily.

·        Clutter-Free: Keeps workspaces clean without tangled wires.

Conclusion

Wireless connections make life easier by enabling communication without cables. From browsing the internet to using Bluetooth headphones, they are part of everyday life.