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FTP uses _________ parallel TCP connections to transfer a file.

(a) 1

(b) 2

(c) 3

(d) 4

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The correct choice is (b) 2

To elaborate: Control connection using FTP port: 21, and data connection using FTP port: 20. The FTP session is started or ended using port 21 and the actual data i.e. files are sent through port 20.

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