Privacy, Devices & Citizenship · lesson 6 of 17 · 15 min
What is a network?
A network is a group of devices — computers, phones, tablets, printers, smart TVs — connected together so they can share information with each other. Your home network connects all your family’s devices through your router, letting them share the same internet connection and even share files with each other.
Networks can be small (just a few devices in one room) or enormous. The internet is the world’s largest network — billions of devices connected together across the entire planet, sharing information every second of every day.
Understanding how networks work is important for cybersecurity because most cyber threats travel through networks. Knowing how information moves helps you understand how to protect it.
Local vs. global: A local network (like your home or school network) connects devices in one place. The internet connects networks all around the world together into one giant global network.
Types of networks
Home network (LAN) Connects devices in your home — computers, phones, tablets, and smart devices — through your router. School network Connects computers and devices in a school building, often managed by IT staff with security controls. Wi-Fi network A wireless local network that uses radio waves instead of cables to connect devices. The internet The world’s largest network — billions of devices connected globally, sharing information across countries and continents. Mobile network Uses cell towers to connect phones and tablets to the internet when Wi-Fi is not available. VPN (Virtual Private Network) A secure, encrypted tunnel through the internet that protects your data when using public networks.
How information travels on a network
When you send a message or load a website, your information does not travel as one big piece. Instead, it is broken into small pieces called packets. Each packet travels independently across the network, finding the fastest available route. When all the packets arrive at the destination, they are reassembled in the correct order — all in a fraction of a second.
Networks need rules — called protocols — so that all devices can understand each other. The most important protocol on the internet is called TCP/IP. Think of protocols like a shared language: without them, devices from different companies and countries could not communicate.
Key words to remember
- Network
- Internet
- Packet
- Protocol
- LAN
Match each network concept to its description
Networks — quiz
What is a network?
- A single computer working alone
- A group of devices connected together to share information
- A type of password
- A website for kids
Answer: A group of devices connected together to share information
A network is any group of connected devices that can share information with each other.
What is the internet?
- A local network in your home
- A single very powerful computer
- The world’s largest network connecting billions of devices
- A type of Wi-Fi router
Answer: The world’s largest network connecting billions of devices
The internet is a global network that connects billions of devices and networks worldwide.
Information on a network travels as one big piece from start to finish.
- True
- False
Answer: False
Information is broken into small packets that travel separately and reassemble at the destination.
What is a packet?
- A type of computer virus
- A small piece of data that travels across a network
- A type of router
- A password manager
Answer: A small piece of data that travels across a network
Data is broken into packets for efficient travel across a network, then reassembled at the destination.
What is a protocol?
- A type of cable
- Rules that devices follow so they can communicate on a network
- A type of computer virus
- A Wi-Fi password
Answer: Rules that devices follow so they can communicate on a network
Protocols are like a shared language — without them, devices from different companies could not communicate.
What does LAN stand for?
- Large Area Network
- Local Area Network
- Linked Access Node
- Long-range Area Network
Answer: Local Area Network
LAN stands for Local Area Network — a network connecting devices in one location.
Your home Wi-Fi is a type of local network.
- True
- False
Answer: True
Your home Wi-Fi creates a local network connecting all your family’s devices.
Why is understanding networks important for cybersecurity?
- It is not important
- Most cyber threats travel through networks
- Networks are only used by businesses
- Networks are always safe
Answer: Most cyber threats travel through networks
Understanding how networks work helps you understand how threats spread and how to protect against them.
What does a mobile network use to connect phones to the internet?
- Wi-Fi routers
- Cell towers
- Cables
- Satellites only
Answer: Cell towers
Mobile networks use cell towers to connect phones and tablets to the internet when Wi-Fi is not available.
A VPN creates a secure, encrypted tunnel to protect your data on public networks.
- True
- False
Answer: True
A VPN (Virtual Private Network) encrypts your internet traffic, protecting your data on public Wi-Fi.
Try it: Computer, network and Wi-Fi
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