The image shows the complete architecture diagram for setting up networking on OCI.

The OCI Tenancy shows two regions: Primary Region in US West (Phoenix) and Secondary Region in US East (Ashburn). The two regions connect to each other with remote peering and also an on-premises data center.

The VCN in each region includes a Service Gateway

Primary Region US West (Phoenix) region

Hosts a single VCN with IP address 10.0.0.0/16 hosting two public subnets and two private subnets. The Bastion Server is in one public subnet and connects to the internet gateway along with the load balancer in the other public subnet. The two private subnet are connected with a NAT gateway.

The first private subnet hosts two app servers and the File Storage. The File Storage uses scripted replication with the File Storage in the US East region.

The second private subnet hosts the primary database which uses Active Data Guard to connect to the Standby Database in the US East Region and is set up for scheduled restoration.

Both the VCNs in the US West region and the US East region host Boot Volumes & Block Volumes. You set up a volume backup copy between the two regions for the Volume Backups and Boot Volumes.

It also includes Object Storage which uses policy-based replication with the Object Storage in the US East region.

Standby Region US East (Ashburn) region

Hosts a single VCN with IP address 192.168.0.0/16.

The US East region replicates the US West regions component architecture but includes restoration and replication capabilities. Each region includes an internet gateway which connects to a DNS. It includes a standby database and scheduled restoration between Volume Backups and Boot Volumes & Block Volumes.