Lisa, a technician, is asked to not allow FTP traffic on a network. Which of the following ports should be blocked on the firewall to achieve this?

The correct answer is A. 21. FTP (File Transfer Protocol) uses port 21 for control/command communication (establishing sessions, sending commands). Blocking port 21 prevents FTP sessions from being initiated. Port 22 is SSH/SFTP, port 23 is Telnet, and port 25 is SMTP - none of these are standard FTP. Note…

Network security

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(26 responses)

A
96% (25)
C
4% (1)

Explanation

FTP (File Transfer Protocol) uses port 21 for control/command communication (establishing sessions, sending commands). Blocking port 21 prevents FTP sessions from being initiated. Port 22 is SSH/SFTP, port 23 is Telnet, and port 25 is SMTP - none of these are standard FTP. Note that FTP also uses port 20 for active data transfer, but port 21 is the primary control port that must be blocked to stop FTP traffic.

Topics

#FTP#port 21#firewall rules#traffic filtering

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