From the following list, identify the port number(s) used by the FTP protocol

A) Ports 20 and 21
B) Port 20
C) Ports 25 and 26
D) Ports 21 and 22

A
Explanation: A) FTP utilizes TCP ports 20 and 21. Port 21 is the control port and is used for session administration; for example, commands, identification, and passwords exchanged between the client and the server and connection setup. Port 20 is used to transfer the data being requested between the computers.