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What is the main difference between TCP protocol and UDP protocol? Which applications use TCP ports and which applications use UDP ports, and list the commonly used port numbers.
The biggest difference between tcp and udp is that one is a connected transport protocol and the other is a connectionless transport protocol.

Commonly used tcp port: 80 www

2 1 ftp

23 Remote login

Udp is generally used for downloading software and chatting software, using qq.

It is precisely because of connectionless transmission that sometimes we send a message, but the other party can't receive it.