Active mode vs. passive mode in FTP? (Describe from whose perspective is the mode and how the data connection is established.) What protocol messages on the control connection are exchanged in...

Active mode vs. passive mode in FTP? (Describe from whose perspective is the mode and how the data connection is established.)

What protocol messages on the control connection are exchanged in downloading and uploading a fi le in FTP, using active mode and passive mode, respectively?