Modelling the internet KS2 Understand how the internet provides the WWW All images from www.pixabay.com Creative Commons Deed CC0

The internet and the WWW Today we are learning about: The internet and the WWW I can explain what the internet is I can explain the difference between the internet and the WWW I can explain how the internet provides access to the WWW

What is the internet? The internet is a vast network of computers and other devices connected together across the planet. The internet is the hardware. Let’s learn a bit more about the different connected devices that make up the internet.

What are clients? Clients are computers setup to access services through the internet. For example, we use a client to view web pages, videos or read emails. Examples of clients include PCs, laptops, mobile phones, some TVs, games consoles and tablet devices. Client Client

What are routers? Routers are devices which help information get to where it needs to be across the internet. They route it. To help routers send the information to the correct location, all devices on the internet have an internet protocol (IP) address. Router

What are servers? Servers are computers setup to provide internet services, such as the world wide web, e-mail or online games. Some of these computers are web servers - they store information in web pages which is called the WWW. There are also domain name servers (DNS), which we’ll learn more about next. Server

What are DNS? Domain name servers (DNS) are a type of server which provide the IP address of the web server holding the website you want to view. For example, a DNS could provide the IP address for the server holding the www.barefootcas.org.uk webpage, which is 109.109.131.16. DNS

Match the description. A computer setup to provide services on the internet. A computer used to access services on the internet. A computer setup to provide the IP address of web servers holding web pages. A device used to route information to the correct place on the internet. Client Server Client Router DNS

Modelling the internet Server Router Client DNS Router Router Router Router Server Server

Step 1 When we request to view a web page, the client computer asks a domain name server for the IP address of the server holding that web page. The web pages available to view are: <Please fill in here the websites you have printed out for this activity linking to your pupils’ topic.> A domain name server holds a directory with the IP addresses of the servers holding web pages.

Step 2 Routers route the message to the server holding the web page using its IP address. The message also contains the client’s IP address. The server holding the web page could be located anywhere across the world. Cables that run underground and under the sea help carry the message between countries.

Step 3 The server receives the request and retrieves the web page from its memory. It then prepares to send the web page back to the client. However web pages are too big to send in one piece, so it is broken down into packets of data each labelled with the client’s IP address. These packets of data are sent back to the client. Sometimes they take different routes across the internet.

Step 4 Once all the packets of data have reached the client, the computer reorders them and the browser constructs the web page for the user to view.

The internet and the WWW Today we are learning about: The internet and the WWW I can explain what the internet is I can explain the difference between the internet and the WWW I can explain how the internet provides access to the WWW