Practice
Make it stick.
Questions come back from levels you cleared, right before you would forget them. When you want the real thing, each world has Pro labs on your own Linux machine.
Review
Clear a level in How Networks Work and its questions show up here.
Pro labs
Real Linux, real packets, real kernel state. Each lab picks up where a level leaves off and runs on your machine in WSL2 or an Ubuntu VM. They are optional: the course never needs them. Interviewers love them.
Challenges
No story, no hints. Something is broken and you find it.
Your progress
Progress lives in this browser, with no account. You have cleared 0 levels. Show it off with a proof page, or move it to another device with a progress file.
AWS exam practice
Separate from How Networks Work. Flashcards and timed question banks for two AWS certifications.