The image shows shared VPC peering topology in Google Cloud with three projects: Project Exadata, Project Finance, and Project Sales all of which are in a Google Cloud region which hosts Oracle Database@Google Cloud.
The Shared VPC hosts a subnet 192.1.0/24 with a DBA VM and connects to Oracle Database@Google Cloud hosting Oracle Exadata Database Service and Oracle Autonomous Database within the Database network.
VPC Finance has a subnet 172.16.0.0/24 and hosts the HR Application.
VPC Sales has a subnet 10.0.0.0/24 and hosts the Sales Application.
DBA VM, HR Application, and Sales Application connect using peering.