During an audit it is identified that a host being used for FTP has additional unused ports open. The server is listening on 21, 20, 43, 80 and 3389. Your boss has tasked you to close the unused ports. Which ports should remain open?
43
20, 21
43, 80
80
20, 3389
3389
FTP uses ports 20 and 21, so those should be left open and the others should be closed. Note: The question asks which should REMAIN open, not which should be closed.
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