[icedchai]

Layers 4 through 6 make some conceptual sense if you consider the lower layers being support/infrastructure for the higher layers. In the old days, before cloud, we used to draw plenty of diagrams that were essentially DB Server -> App Server -> Web Server -> Load Balancer... it's the same kind of thing.

I say some sense because layer 3 "permissions" sticks out to me like a sore thumb. Whenever I work with terraform I spend 50% of the time on permissions. I'd hesitate to call it a "layer" given the pervasive nature of IAM roles/permissions across all resources.