Networks and the Internet
beginner 30 min 3 tasks
How computers talk to each other: networks, IP addresses, ports, DNS, and what really happens when you open a website.
By the end of this lesson you can explain what a network and the internet are, what an IP address and a port are, what DNS does, what a client and a server are, and follow a web page request from your browser to a server and back.
Almost every attack, and almost every defence, travels over a network. These words will come up in every later path, so take your time here.
Part of these paths
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Updated 2026-11-01