What are the details of the seven-layer network protocol?

Application layer: An application that communicates with other computers, it is a communication service for applications.Example: NFS,SMTP

Presentation layer: The main function is to define data format and encryption.Example: encryption.ASCII etc.

Session Layer: It defines how to start, control and end a session, including the control and management of multiple bidirectional messages.Example: RPC, SQL

Transport layer: Functions include whether to select an error recovery protocol or a non-error recovery protocol, and multiplex the input of data streams of different applications on the same host.

Network layer: It defines the end-to-end packet transmission, which defines the logical addresses that can represent all nodes, and also defines the way of routing implementation and learning.

Data Link Layer: Defines how data is transmitted over a single link.

Physical layer: The definition of all details is usually done by multiple specifications.

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