The figure is a diagram depicting the reference topology described in this guide for WebCenter Portal and Oracle Access Manager. It is a complex diagram that shows the internet at the top and workstations making a connection through firewall to the DMZ Public Zone via open ports 443 and 80. Another firewall separates the DMZ Public Zone from the next secure zone that hosts the WebCenter Portal server domains WC_SPACES, WC_Collaboration, WC_Portlet, WC_Utilities, and so on. Finally, another firewall separates the secure zone from the data tier, which contains the WebCenter Portal database.