This image shows a single Oracle Cloud Infrastructure region. The region includes a single availability domain with three fault domains. The availability domain includes a virtual cloud network (VCN) with a public regional subnet and a private regional subnet, an internet gateway, a NAT gateway, and a dynamic routing gateway for private connections from the customer's data center through IPSec VPN or FastConnect. The VCN provides routing tables for each subnet and each subnet provides its own security list access. The regional subnets are arranged as functional layers