This illustration includes:

A gray box labelled Oracle Cloud Infrastructure Region, which encompasses three availability domains.
A blue box labelled Compartment, which encompasses three availability domains.
Inside the Compartment box is a maroon box labelled VCN, which encompasses three availability domains.

Availability Domain 1 has Public Subnet 10.0.0.0/24 with Cloud Manager and File server nodes.
Availability Domain 2 has Private Subnet 10.0.1.0/24 with Elasticsearch and  Database nodes.
Regional Subnet 10.0.2.0/24 spans Availability Domains 1, 2, and 3. Availability Domains 2 and 3 each have Mid-tier and Win Client nodes.