Computer Networks · topic
The OSI and TCP/IP models, what a service, an interface and a protocol are, how each layer wraps the data from above in its own header (encapsulation), the name of the unit at each layer (message, segment, datagram, frame, bit), and which device works up to which layer (hub, switch or bridge, router, host).
A computer network has to solve many separate problems at once: put bits on a wire, find the boundaries of a frame, detect damaged frames, share a medium, find a path across many networks, deliver data reliably between two programs, and give those programs names and conventions.
One-page visual sheets for this topic, in the sheet library on the store. Previews are free; the full sheets come with the subject pack.
