Brother MFC-3420C - Manual (Page 149)

NETWORK SCANNING (MFC-3320CN AND MFC-3820CN ONLY) 8 - 3
Specify your machine by address
Enter the actual IP address of the machine in the IP Address field.
Click Apply and then OK.
Specify your machine by Name
Enter the machine Node name in the Node Name field.
Click Apply and then OK.
Search from a list of available device
Click Browse and select the appropriate device you want to use.
Click OK.
Click Apply and then OK.