Classification data transmission
In accordance with the sequence of data transmission point: serial transmission, parallel transmission
The data transmission synchronization points: synchronous transmission, asynchronous transmission
And the flow of data transmission according to the time sequence of points: simplex, half-duplex, full-duplex
Seven layer OSI model:
The application layer, presentation layer, session layer, transport layer, network layer, data link layer, physical layer
Wherein the application layer, presentation layer, session layer of the data transfer between the host; the transport layer, network layer, data link layer, the physical layer of the underlying data stream