ZAK's Networks Lab

Data transmission and the internet are the most describe-heavy topics on Paper 1 — and the easiest to get wrong when you have only read about them. Corrupt a bit and let the parity block find it, send a message as packets over routers and put it back together, cut an IP address into its network and host parts, walk a request from URL to page, add the headers layer by layer, share a key with RSA, and edit a block to see the chain break. Every tab has a Practice question.