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The transport layer protocol used by FTP is (subject), and the default data port number of FTP is ().
Answer: c

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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