To transfer files to your company's internal network from home, you use FTP. The administrator has recently implemented a firewall at the network perimeter and disabled as many ports as possible. Now you can no longer make the FTP connection. You suspect the firewall is causing the issue. Which ports need to remain open so you can still transfer the files? (Select TWO

Ports 20 and 21

Explanation:

For the FTP to work, there are two parts that are required; the command and the data.  These two parts are sent on the two ports 21 and 20 respectively.  If the firewall is indeed blocking connections on ports 21 and 20, then your FTP will not work.

Hence, you need to open ports 20 and 21 to allow FTP to remain functional.

Cheers.

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