The image shows an example of a single network architecture with an on-premises data center connecting to an OCI region using either FastConnect or Site-to-Site VPN.

The On-Premises Data Center includes customer premises equipment. It connects to the OCI Region using either FastConnect or Site-toSite VPN through a Dynamic Routing Gateway. The DRG uses a DRG attachment to connect to the VCN.

The OCI Region hosts a VCN which includes one public and two private subnets. The public subnet includes the Web Tier or Bastion service.

One private subnet includes the App Tier and the other private subnet includes the database.