b.3 networks & connectivity
The world is connected. Learn how computers talk to each other over the Internet, how Wi-Fi and fibre optics move data, and how to protect your network from hackers.
No computer is an island. Networks & Connectivity explains how we link billions of devices together to form the modern world. We trace the journey of data as it travels through Fibre Optic cables and Wi-Fi signals, guided by strict rules called Protocols (like TCP/IP). You’ll learn the difference between the physical Internet and the World Wide Web you browse, and master the Network Security tools - like firewalls and encryption - that stop cyber-criminals from listening in on your digital conversations.
Connect the dots. Discover how computers link up to form Local Area Networks and Wide Area Networks and compare the shapes and structures that keep us all online.
From copper cables to invisible radio waves. Explore the physical highways that data travels on and the clever switching tricks that stop the internet from jamming.
Meet the hardware heroes. Learn the difference between a switch and a router and master the diagnostic tools like Ping that help you fix a broken connection.
Learn the language of the internet. Dive into the TCP/IP stack to see how strict rules and layers ensure that an email sent from London arrives perfectly in Tokyo.
They are not the same thing. Unravel the difference between the physical Internet and the World Wide Web service and see how DNS turns text into IP addresses.
Hackers vs Defenders. Explore the dark side of networks with malware and phishing and learn the pro techniques like encryption and firewalls used to stop them.
Last modified: February 13th, 2026
