Control: Ensure subnets are not publicly accessible

Description

Public access to a Network's subnet increases resource attack surface and unnecessarily raises the risk of resource compromise. A network source is a set of defined IP addresses. The IP addresses can be public IP addresses or IP addresses from VCNs within your tenancy. After you create a network source, you can reference it in policy or in your tenancy's authentication settings to control access based on the originating IP address.