OSI will computer network architecture (architecture) is divided into the following seven layers:

Physical Layer: the data will be converted into electronic signals that can be transmitted through the physical media when the post office in the porter.

Data Link Layer (Data Link Layer) is responsible for network addressing, error detection and correction. Frames are formed when headers and footers are added to packets. The Data Link Table Header (DLH) is the method that contains the physical address and error detection and correction.

The data-link table tail (DLT) is a string of characters that indicates the end of the packet. Examples include Ethernet, wireless local area networks (Wi-Fi), and General Packet Radio Service (GPRS).

Extended information:

Data link layer: determines how the network medium is accessed.

Data is framed at this layer and flow control is handled. This layer specifies the topology and provides hardware addressing, and is the equivalent of the box loaders and unloaders in the post office.

Network layer: right-of-use data is routed through large networks Equivalent to sorting workers in the post office.

Transport layer: provides reliable end-to-end connections Equivalent to the mail delivery clerk running the post office in a company.

Session layer: allows users to establish connections using easy-to-remember names equivalent to the secretary who receives and sends mail, writes and opens envelopes in a company.

Representation layer: negotiates the format of the data exchange, equivalent to the assistant who briefs and writes letters for the boss in a company.

Application layer: the interface between the user's application program and the network.

Baidu Encyclopedia - OSI Model