Computer Networks and How the Internet Works
Computer Networks and the Internet
Lesson duration is: 50 minItems in this lesson
Computer Networks and the Internet
Open by linking to pupils' everyday experience: using tablets, laptops, school logins, websites and videos all depend on networks.
Our learning goal
I can explain what a computer network is and how the internet helps devices share information and online services.
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What words come to mind when you hear internet or network?
Use this to activate prior knowledge. Expect words such as Wi-Fi, websites, computers, cables, router, messages and sharing. Pick a few entries to connect to the learning goal.
Lesson introduction
This KS2 computing lesson explores Computer Networks and How the Internet Works. Pupils identify common network devices and explain how connected computers exchange data and access online services. It is suitable for classroom teaching, independent practice or a clear recap of the topic.
This slide contains the required verbatim text. Keep it separate and early, as requested.
What is a computer network?
A computer network is a group of devices that are connected.
They can share information, communicate and use the same services, such as printers, files or websites.
Keep the definition simple and concrete. Emphasise that the devices do not need to look the same: laptops, tablets and desktop computers can all be part of one network.
Where we find networks
Networks are used in many places:
at school for logins, shared files and printers
at home for Wi-Fi devices
around the world through the internet
Help pupils notice scale: some networks are small, like one classroom, and some are huge, like the internet.
Why networks are useful
Networks help devices work together.
people can send messages
files can be shared
one printer can be used by many computers
online services can be reached quickly
If useful, contrast with a device that is not connected: it can still work, but it cannot easily share or access online services.
What is a computer network?
A group of connected devices
A single powerful computer
A website with many pages
A password for the internet
Checks the core definition from slides 3 to 5. Distractors reflect common confusion between networks, websites and single devices.
How networks help
A computer network is a group of connected devices. They can share information and use the same services, such as printers or websites.
This reinforces the basic definition and purpose of networks using familiar lesson wording.
Common network devices
Some important devices are:
computers and tablets
routers
switches
servers
cables or wireless links
Do not overload this slide with technical detail. It introduces names that will be explained in the next slides.
Router, switch and server
A router helps send data between networks, including to the internet.
A switch connects devices on the same local network.
A server stores or provides things other computers need, such as files, websites or logins.
A common misconception is that the router is 'the internet'. Clarify that it is a device that helps devices reach other networks, including the internet.
How data moves
When devices communicate, they send data.
This data is broken into small pieces called packets so it can travel across a network and be put back together at the other end.
For KS2, packet is enough as a simple idea: small pieces of information sent across a network. Avoid advanced protocol detail.
Sending information step by step
Device sends data → router or switch directs it → network carries it → another device receives it
This is how computers can share files, open webpages and send messages.
Use the arrow notation because the process itself is the main idea here. You can model it with a quick spoken example, such as sending a message from one laptop to another.
Which device sends data between networks?
Server
Switch
Router
Tablet
Tests the distinct job of the router. Pupils may confuse router and switch, so discuss why a switch is for the same local network.
How data moves
When devices communicate, they send data. It is broken into small pieces called packets. A router or switch then directs it across the network.
An application-style recall task using the process from slides 8 and 9.
How does a message travel across a network?
Expected answer elements: data is sent in packets, a router or switch helps direct it, it travels across the network, and the other device receives it. Accept simple step-by-step explanations in pupils' own words.
What is the internet?
The internet is a huge network of networks.
It connects many smaller networks across towns, countries and the world so devices can share information and use online services.
Stress that the internet is not one single computer. It is many connected networks working together.
Internet or World Wide Web?
These are not the same thing.
The internet is the connection system.
The World Wide Web is one service that uses the internet to show websites.
Other services include email, video calls and online games.
Pupils often use 'internet' and 'web' as if they mean exactly the same thing. This contrast is an important computing idea.
How a webpage reaches you
When you type a web address or click a link:
your device sends a request
the request travels across the internet
a server sends the webpage data back
your browser shows the page
Keep the process concrete and familiar. Use examples pupils know, such as the school website or a child-safe learning platform.
Online services we use
The internet helps us use many services:
websites
email
video streaming
cloud storage
online learning platforms
All of these need networks to move data.
Link to UK primary school life: online reading sites, homework platforms and school communication systems.
Local network and internet
A local network connects devices in one place, such as a school.
The internet connects lots of different networks together.
A school network can work on its own, but the internet lets it reach online services.
This distinction helps pupils answer later questions accurately: not every network is the internet.
What is the internet?
One giant computer
A huge network of networks
A list of web addresses
A type of browser
Checks the key idea from slide 10 and tackles the misconception that the internet is one machine.
Internet and the Web
The internet is the connection system. The World Wide Web is one service that shows websites using the internet.
Reinforces the important distinction between the internet and the World Wide Web.
Which online service do you use most for learning?
Websites
Videos
Cloud storage
Learning platforms
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Networks in a school
In school, a network can help pupils and teachers:
log in on different computers
open shared files
print work
visit learning websites
save work on shared systems
Use examples from the pupils' own setting where possible, but keep them general enough to fit most UK classrooms.
Using networks responsibly
When we use networks and the internet, we should:
keep passwords private
use trusted websites
ask an adult for help if something feels wrong
be kind and sensible online
Stay rooted in computing by tying responsible use to networked systems. Keep this brief, as the lesson focus is how networks work.
Big idea summary
A network connects devices so they can share data and services.
Routers, switches and servers each have different jobs.
The internet is a huge network of networks that lets us reach websites and other online services.
This slide lands the central question by pulling the whole lesson together in three clear statements.
Which is something a school network can help you do?
Charge a battery
Make a new keyboard
Open shared files
Build a website
Connects the concept to pupils' everyday school experience and supports the application task in the content slides.
Give one safe rule for using networks.
Expected answer elements: keep passwords private, use trusted websites, ask an adult for help, be kind and sensible online. Any one clear example is acceptable.
What is one thing you learned today?
Reflection prompt for the exit ticket. Invite short personal responses about the main learning point.
What part felt trickiest today?
Reflection prompt for the exit ticket. Use responses to identify misconceptions or parts to revisit next lesson.
Glossary
computer network - a group of connected devices that can share information and services
data - information that a computer sends, stores or receives
packet - a small piece of data sent across a network
router - a device that sends data between networks
switch - a device that connects devices on the same local network
server - a computer that stores or provides services, files or websites for other devices
internet - a huge network of networks connected around the world
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Glossary
World Wide Web - websites and webpages that use the internet
website - a collection of related webpages
webpage - one page that can be viewed in a web browser
browser - software used to open and view webpages
local network - a network in one place, such as a school or home
online service - something provided through the internet, such as email or streaming
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