How many levels does Dusk have?

Excuse me, could you please elaborate on the number of levels that Dusk possesses? I'm curious to understand if Dusk, as a cryptocurrency or blockchain protocol, operates with a tiered system or structure that can be divided into distinct levels. Is there a hierarchy within its architecture, or does it function in a more linear or flat manner? Clarifying this point would greatly aid my understanding of the intricacies and workings of Dusk.