This image shows an Oracle PeopleSoft topology deployed in an Oracle Cloud Infrastructure region. The resources are attached to a single virtual cloud network (VCN) 10.0.0.0/16 that spans 3 availability domains.

A dynamic routing gateway (DRG) provides private connectivity using FastConnect to the customer's data center.

The VCN has six subnets arranged as functional tiers.

Load Balancer tier (subnet 10.0.10.0/24): A load balancer in availability domain 2 manages traffic to servers in the Web Server tier.
Web Server tier (subnets 10.0.20.0/24 and 10.0.21.0/24): Each subnet resides in a separate availability domain (domains 2 and 3) and contains a virtual machine (VM) that hosts a web server. Each web server handles traffic to an application server in the same availability domain in the Application Server tier.
Application Server tier (subnets 10.0.18.0/24 and 10.0.19.0/24): Each subnet resides in a separate availability domain (domains 2 and 3) and contains a VM that hosts an application server. Each application server uses database services in the Database tier.
Database tier (subnet 10.0.22.0/24): A database resides in availability domain 1 and provides database services for the Web Application tier. The database shows a Data Guard connection to on-premises data sources.