OSI models are divided into 7 floors
Layer description
The application layer provides the user with the corresponding interface so that the supplied networking function is used.
Represents formatting of the layer completion data
Conference layer controls communication links between two hosts (open, operation, and closing)
Transport layer provides data transmission services (reliable or unreliable)
Network layers provide a set of addresses between two hosts, while responsible for the route selection of packets
The data link layer controls the physical communication link between the two hosts: At the same time, it is also responsible for shaping the data to transmit on physical media.
Physical layer physical media is responsible for ejecting data in the form of a series of electronic signals
Insert a sentence, the famous Cisco network engineer is mainly responsible for the next three floors. Most of them need our programming mainly four layers.
