CISSP Practice question #227

On our workstations we are implementing new security measures. As part of that we will start blocking TCP port 20. Which protocol are we blocking?
A: FTP data transfer.
B: FTP control.
D: Telnet.

CBK 4: Communication and Network Security
Source: practice tests –


A: FTP (File Transfer Protocol): Uses TCP Port 20 for the data transfer – the actual data is sent here.

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