It's not important the type of device.
It's a theoretical question. I read a question about AAA:
"Which two statements about AAA with the local database are true?"
And the answers which were signed:
"It support a limited number of username and passwords"
and
"Accounting is not supported locally"
And I don't remember this limitation of number of users and password. I tried to search more information about it, but I didn't find.