File Transfer Protocol (FTP), referred to as "Text Transfer Protocol", is used to control the two-way transmission of files on the Internet. When FTP clients upload files, the connection established through server port 20 is a data connection based on TCP, and the connection established through server port 2 1 is a control connection based on TCP.
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Annual work summary, company finance department, and the first plan.
In 20xx, the company encountered some difficulties in