"OSI transport services" include layers 1 through ... For more on this layer, see data link protocol. Layer 1 passes bits onto, and receives bits from, the connecting medium (wire, fiber).

and the layered approach lets different protocols be swapped in and out to accommodate different network architectures. For more details about each layer, see OSI model. THIS DEFINITION IS FOR ...

Topics include: TCP/IP and OSI layered network architectures and associated protocols, application layer, network programming API (sockets), transport, congestion, flow control, routing, addressing, ...