OSI seven-layer network

7-Application layer

Various application software

6-presentation layer

Conversion, encryption, decryption and compression

5-session layer

Establish a session, guarantee a session, terminate a session

4-Transport layer

TCP/UDP

3-Network layer

routing

2-Data link layer

exchange

1- Physical layer

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Origin www.cnblogs.com/bpzblog/p/12719569.html