Canon MX920 Series Online Manual page 194

4. Key ID:
Select the Key ID (index) set to the access point.
5. Authentication:
Select the authentication method to authenticate the printer's access to the access point.
Normally, select Auto. If you want to specify the method manually, select Open System or
Shared Key according to the setting of the access point.
7. Click OK.
Important
If the printer cannot communicate with the computer after the encryption type of the printer
was switched, make sure that encryption types for the computer and the access point
matches that set to the printer.
Note
Changing the network settings with the USB cable temporarily may switch the default
printer. In this case, reset Set as Default Printer.