This DR site is an  active standby , as opposed to a  cold  site or  warm  site. It is also  called a  hot  site because the servers are running or are in use. A warm site is  one where the servers are running but not connected to the external  environment, and a cold site is one where the servers and applications are  physically present, but nothing is running. Figure 18-17 is an implementation-specific diagram of the WebSphere  Application Server services configuration in this instance. It shows the use of  WebSphere Application Server Network Deployment. This diagram outlines the  use clusters, cells, and nodes. The reason for showing this specific aspect of the solution is that this  configuration is where WebSphere Application Server Network Deployment is  needed to manage the Enterprise JavaBeans (EJB) transactions between IBM  Content Navigator and the IBM Content Platform Engine service. To get to the  HA requirements, this type of implementation is needed. Note:  There are other configuration options that support an HA configuration.  This one is chosen due to the requirements listed. 596  Building IBM Enterprise Content Management Solutions From End to End Figure 18-17 WebSphere Application Server services configuration