It is common for people not to know the default username and passwords of devices especially now that most devices are considered “plug and play”. With this, most people does not feel the need to open and actually read the manual just like me!
For the MFC-9120CN using the BRAdmin light, click on the network navigation icon
A new window will open asking for the password, type access
this will allow you to configure your Brother printer.
For configuring using your web browser the default username and password is as follows:
Username: admin
Password: access