2. How is all that data traffic controlled on the Internet?
Using special rules called Protocols
You need to know the basics about the two main protocols
So we’ll start with the definition in your booklet…

3. Protocols are rules that allow computer systems to connect with different systems to transfer data.
This is important because the Internet involves many different types of devices.
And it’s vital as rules are needed for how the Internet transfers data using packets
packets

4. B A

5. B A

6. B A

7. B A

8. B A

10. Together they’re called TCP/IP
All that is controlled by two protocols that make the Internet possible:
TCP IP
Together they’re called TCP/IP

11. Transmission Control Protocol (TCP)
Is responsible for breaking data into packets
Then assembling the packets again when they arrive

12. Internet Protocol (IP)
Is responsible for handling the routing of packets
That’s addressing, sending and receiving packets over the Internet
Every device on the Internet has a special numerical address
It is called an IP address
4 numbers (up to 255) divided with dots

13. Internet Protocol – IP Addresses
IP addresses can be ‘private’ or ‘public’
For example, computers on our school network use private IP addresses because they only work on our LAN
IP addresses can also be ‘static’ (permanent) or ‘dynamic’ (temporary)
For example, your ISP will give your home router a temporary IP address
But today’s networks are smart enough to use all kinds of IP addresses to deliver packets to the right devices!

14. TCP IP
TCP

15. Without protocols, the Internet would be chaos!
So later, we’ll look at several more
These include protocols for
Also for the web, or HTTP
We’ll also take a closer look at File Transfer Protocol, or FTP
But for now, just remember TCP/IP!

16. Let’s now watch a video that shows how all this technology helps the Web work…