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OSI seven layer model
2022-07-05 15:24:00 【Nineteen (drag on and on)】
OSI Seven layer model
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Preface : Model
OSI Seven layer model :
- application layer
- The presentation layer
- The session layer
- Transport layer
- The network layer
- Data link layer
- The physical layer
TCP Five layer model :
- application layer
- Transport layer
- The network layer
- Data link layer
- The physical layer
1: The physical layer
The physical layer defines the relationship between the device and the transmission medium . Such as copper cable 、 optical cable 、 voltage 、 Cable specification 、 A hub 、 Repeater 、 Network adapter, etc .
Main functions of physical layer : Establish connection or disconnection with the communication medium ; flow control ; Signal modulation or conversion between different equipment .
2: Data link layer
Data link layer : Main detection and correction The physical layer
Possible errors .
3: The network layer
The network layer : Transmit variable length data sequences from source hosts on one network to target hosts on different networks , At the same time, ensure the request quality of the transport layer .
4: Transport layer
Transport layer : Provide services for communication between two host processes . Applications use this service to transport application layer messages .
5: The session layer
The session layer : Control the dialog connection between computers , establish 、 Manage and terminate connections between local and remote applications .
6: The presentation layer
The presentation layer : Enable communication applications to interpret the meaning of exchanged data . The service provided is data compression 、 Data encryption and data description .
7: application layer
application layer : Defines the interaction rules between application processes , Provide services for different network applications through different application layer protocols . Such as HTTP
agreement ,SMTP
agreement .
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