The image shows an Oracle Cloud Region A and Oracle Cloud Region B.

Oracle Cloud Region A contains Availabilty Domain 1 and Availability Domain 2.

Availability Domain 1 contains Fault Domain 1 and Fault Domain 2.

Fault Domain 1 contains a VCN with:

• Subnet Public containing Bastion Service.
• Subnet Private XCenter Web/App containing a VM.
• Public Subnet XCenter Database with ATP-D.

Fault Domain 2 contains a VCN with:

• Subnet Public containing a Public Load Balancer and an API Gateway. The API Gateway connects to the 3rd Party Cloud via API Integration. The Public Load Balancer connects to the:
  • VMs in Fault Domain 1 and Fault Domain 2.
  • Retail Stores Xstore POS outside the Oracle Cloud Region via DRG and Site-to-Site VPN.
  • Internet users via WAF and Internet Gateway.
• Subnet Private XCenter Web/App containing a VM.
• Public Subnet XCenter Database containing an ATP-D.

Availability Domain 2 contains a Fault Domain with a VCN containing:

• Subnet Public containing a standby Load Balancer.
• Subnet Private XCenter Web/App containing a VM.
• Public Subnet XCenter Database with a local standby ATP-D.

Oracle Cloud Region B contains a Fault Domain with a VCN containing:

• Subnet Public containing a Public Load Balancer and an API Gateway. The API Gateway connects to the 3rd Party Cloud via API Integration. The Public Load Balancer connects to the:
  • VMs in Fault Domain 1 and Fault Domain 2.
  • Retail Stores Xstore POS outside the Oracle Cloud Region via DRG and Site-to-Site VPN.
  • Internet users via WAF and Internet Gateway.
• Subnet Private XCenter Web/App containing a VM.
• Subnet Private containing a remote standby ATP-D.