Overview
A computer network lets independent machines exchange data despite being built by different vendors,
OSI & TCP/IP Models
Two competing layer models are used to describe networking: the OSI model (7 layers, designed by
Data Link Layer
The data link layer is responsible for moving frames between devices on the same local network
Network Layer & Routing
The network layer's job is addressing and forwarding across different networks — the piece that
Transport Layer (TCP/UDP)
The transport layer is where "get some bytes from A to B" becomes either a reliable, ordered