Layer description
The application layer provides the user with the corresponding interface to use the supplied network function representation of the formatting session layer of the completion of the data to control the communication link (open, operation and closed) transport layer between two hosts (reliability or Unreliable) Network layer provides a set of addresses / addressing mechanisms between two hosts, while responsible for the route selection data link layer for packets controlling the physical communication link between two hosts: At the same time, it is also responsible for shaping data. In order to transmit physical layer physical media in physical media, it is responsible for the transmission of data in the form of a series of electronic signals.
Figure 1-1 OSI network model
