Notes
Interactive explanations, the kind you poke at rather than just read. Built by hand, no frameworks. Each one runs entirely in your browser.
One HTTPS request onto the wire: the OSI layers it's wrapped in, the TCP and TLS handshakes it waits on, and how HTTP/1.1 → 2 → 3 changed what happens next.
Addressing & subnets, NAT, routing tables, cloud VPCs and transit gateways, DNS resolution.