Bob, a New Network Consultant, Is Helping a Business with Their

Multiple Choice

Bob, a new network consultant, is helping a business with their website updates. The firewall is in default deny mode, so he opens up port 21 to allow for FTP access to the webserver from the Internet. However, FTP still does not work. He notices that clients can connect, but cannot transfer any data. Why does FTP still not work?

A) FTP operates on port 23
B) FTP operates on port 25
C) FTP also uses port 20
D) FTP uses UDP which is connectionless