Clients must upload files to a server that uses FTP. Which port is the FTP control connection?
Select an answer to reveal the explanation.
Short Explanation
The file drop has its own front door, and that door is TCP 21. You permit the FTP control connection. An encrypted shell, a clear-text terminal, and a web page are other services.
Full Explanation
FTP's control connection uses TCP port 21. Clients that upload to an FTP server need that port permitted. TCP port 22 is SSH, an encrypted command line, not the FTP control connection. TCP port 23 is Telnet, a clear-text terminal. TCP port 80 is HTTP. A web server is not the FTP control channel. Exam caveat: the data connection is a separate part of FTP. This question asks for the control connection, which is TCP 21. Operational check: permit TCP 21, upload a test file, and confirm the server lists it. Upload a small test file and confirm the server stored it. Confirm a clear-text terminal port is not what carried the file. Write the result on the ticket before you close it. Confirm the file name appears in the server listing.