Which port does FTP uses, Basic Computer Science

Why is it called out of band protocol?
A1) FTP uses port 20 and port 21; port 20 is used for data connection, whereas port 21 is used for control connection. FTP is known as out-of-band protocol, as it uses two separate ports of data communication and control communication.
Posted Date: 5/1/2012 11:21:10 PM | Location : United States

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