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OpenStack uses three API endpoint variants for each service: admin, internal, and public. The admin API endpoint allows modifying users and tenants by default, while the public and internal APIs do not allow these operations. In a production environment, the variants might reside on separate networks that service different types of users for security reasons. For instance, the public API network might be visible from the Internet so customers can manage their clouds. The admin API network might be restricted to operators within the organization that manages cloud infrastructure. The internal API network might be restricted to the hosts that contain OpenStack services. Also, OpenStack supports multiple regions for scalability. For simplicity, this guide uses the management network for all endpoint variations and the default RegionOne region.