LabsPartly open
Build it, break it, see the result
Reading tells you how a system should behave. A lab lets you find out. Pick a kind and a topic.
Explore a small network
Run real commands on any device, then step through the packet they sent, one hop at a time.NetworkingOpen labFix the office network
Two office PCs cannot reach the server two routers away. Find the three faults with real commands and fix them.NetworkingOpen labPlan the school network
The school has one block, 10.20.0.0/22. Give every group its own block that fits its devices, with no overlaps.NetworkingOpen labBuild a router
A laptop and a server sit on different subnets. Place them, add a router, cable everything and set the addresses until they can talk.NetworkingOpen labReach the home server from outside
A home router shares one public address with every device behind it. Make the laptop reach the outside server, let the outside server reach the home web page through a forwarded port, and keep the guest network away from the home devices.NetworkingOpen labConnected, but no internet
A laptop is plugged into the home network and cannot load a page. Walk up the layers from the cable to the web page, find the three faults, and fix each one where it lives.NetworkingOpen lab
How a visual lab works
Build
Add parts from the list, link them and set their size. Switch between plain names and real AWS names at any time.Choose what to break
Open a part and press Break it. That only arms the failure. Nothing changes until you run.Press Run
The design plays through every scenario: normal traffic, the peak, and each failure.Read the checks
Every test case passes or fails on the board, with the number it measured and why. Fix one thing and run again.