Example for Database architecture
&quot;3 tier database architecture&quot; is a bit of misnomer, as database by itself doesn't have extra tiers. So what are the 3 tiers? From outter-most to inner most, they are:

presentation,

application processing,

data management.


https://example.net is literally 1-tier since it doesn't have application processing and data management, it just presents a text permitting you to use that domain name in documentations.
FTP would be a 2-tier protocol since it doesn't have application processing.