Seven-layer model diagrams and service port!

Then encapsulation process

 

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1.HTTP commonly used protocol proxy server port number: 80/8080/3128/8081/9098

2.SOCKS proxy server commonly used protocol port number: 1080

3.FTP (File Transfer) protocol commonly used proxy server port number: 21

4.Telnet (remote login) protocol commonly used proxy server port number: 23

TFTP (Trivial File Transfer Protocol), the default port number is 69 / udp

5: DHCP (Dynamic Host Configuration Protocol) port numbers: 68/67