Question

FTP sometimes uses a random port for data transfer, but an FTP server always, unless programmed otherwise, listens to the same port for session requests from clients. What port does an FTP server listen on

Answer 1

An FTP server will always listen on port 21, but sometimes port 20

Step-by-step explanation:

To be precise,

Port 21 is use to establish the connection between the 2 devices or clients.

Port 20 is then used as the gateway for data transfer between connected clients.