IP Networking, Made Plain Addresses, subnets, routes — the three ideas underneath every network, from your apartment Wi-Fi to the internet backbone. Learn them once, properly, with diagrams instead of acronym soup.

A network interface's location on a network — more like a postal address than a name, which is why devices can change addresses and keep their identity.

Those are private ranges, reserved for use behind a gateway; the whole house shares one public address through NAT.

The concept, yes — it explains guest networks and why some devices can't see each other. The binary math is optional until certification exams.