Networking: How the internet really works

The internet works because layers divide one miracle into many solveable problems.

Layering as survival

Each layer trusts the one below and serves the one above. That contracts lets copper, fiber, radio and code improve independently.

You meet HTTP and DNS first because you use them daily, then descend to TCP, IP, and Ethernet, learning why each exists.

Nine units: layering, the application layer, transport, network layer, link layer, wireless, security, multimedia, and network management.

Flashcard

HTTP

The web’s request protocol

Client asks, server responds, stateless by design; sessions are bolted on above.

TCP guarantees: