Explore Networking Basics

Networking gets taught as a stack of labels — seven layers, a handful of acronyms, memorize and move on. That approach produces students who can recite "Application, Presentation, Session..." and still can't tell you why a switch and a router aren't the same box, or why the home gadget with four ports is quietly doing three different jobs at once.

Here the layers get anchored to things you can point at: a switch forwarding by MAC address, a router making decisions by IP, DNS turning a name you typed into an address a packet can actually use. Nugget draws the path first — the resolver chain, the handshake, the frame-to-packet-to-segment stack — then asks you to work across it, the way you'd actually trace a problem: check the interface, ping the gateway, ping something further out, see where the answers stop.

The habits this builds are diagnostic ones. Once you've traced a DNS lookup by hand or watched a SYN handshake stall, "the internet is down" stops being your first guess and becomes your last resort.