What is the OSI seven layer model? What is the role of each layer?

Maybe a lot of people are right osi Seven layer model It's a strange word , If you are not a person who studies computer or knows computer knowledge , I don't know what this means . Actually , It is an international standardized standard system specially used for computers or communication systems , It acts as a model body , It is abstract for many people . Today's article will be read with Xiaobian osi What is the seven layer model ？ What is the role of each layer ？

osi Seven layer model

One 、osi What is the seven layer model ？

For people who don't understand computers , Computer terminology is really obscure , We take it literally osi Seven layer model , In short, he means that the computer system has seven layers , They are ： application layer 、 The presentation layer 、 The network layer 、 The session layer 、 Transport layer 、 There is also the data link layer 、 Physical layer, etc . And each layer of them means something different , It also has different functions ,osi The seven - layer model is an international standard , Everyone who studies computer should master relevant knowledge .

Two 、 What is the role of each layer ？

1、 application layer

The application layer is the whole osi The top layer of the seven layer model , It mainly provides services for application processes . For example ：DNS Domain name resolution 、 In web browsing http etc. , All need application layer services , It can regulate how these communication software are used .

2、 The presentation layer

The presentation layer is in the sixth layer of the whole system , It is also a standard for communication , And can help a variety of data to achieve free conversion .

3、 The session layer

The session layer acts as a communication bridge , It establishes a connection for communication between the two ends .

4、 Transport layer

The simple understanding of the transportation layer is to provide transportation for data , It can check the error of the collected message .

5、 The network layer

It generally refers to IP Address , It can convert the collected message into IP Datagram .

6、 Data link layer

This data link layer is mainly used for transmission , It encapsulates all the data received above into frames , And then to the physical layer .

7、 The physical layer

As the bottom layer of the whole system , It is also our common network cable interface , Or the optical fiber interface .

That's right osi What is the seven layer model ？ What is the role of each layer? The answer to these two questions , I believe you can also understand it a little . Computer knowledge is extensive and profound , With the development of the Internet , Our life has more and more contact with computers , Master more computer knowledge , Help to enhance our own competitiveness .