This image shows two regions, each with one availability domain. Backup object storage is provided in each region. Each region has a similar infrastructure. The regions are connected by dynamic routing gateways. Data Guard connects the Exadata database systems in each region using remote peering gateways.

Each region contains a single virtual cloud network (VCN) configured with four regional private subnets and the following gateways:

• A dynamic routing gateway (DRG) for private communications between the customer data center and the VCN and subnets using FastConnect and for secure communications between VCNs in different regions
• Remote peering gateway for communications between subnet resources in different regions using private IP addresses
• Service gateway to provide access to regional services such as object storage

Within each region, a VCN provides the following subnets arranged as functional tiers:

• Regional Private Subnet A: A load balancer manages traffic from end users to a Web Server cluster located in Subnet B.

• Regional Private Subnets B: A Web Server cluster receives traffic from the load balancer and manages traffic to an Application Server cluster connected to the Exadata database system that spans subnets C and D.

• Regional Private Subnets C and D: Exadata database systems span subnets C and D for client and backup traffic. Oracle Data Guard is used for data synchronization and failover.