Objectives4.1. Overview4.2. Choosing a Topology4.2.1. Topology Planning Considerations4.2.1.1. Security4.2.1.2. Cost4.2.1.3. Administration4.2.1.4. Performance4.2.1.5. Availability4.2.1.6. Scalability4.2.1.7. Session State4.2.1.8. Planning Considerations Summary4.3. Topology Examples4.3.1. Single Server Topology4.4. Three-Tier Topology4.5. MultiTier and MultiCell Topology (Gold Standard—99.999%)4.6. Mixed Server Topology4.7. Topology Planning for z/OS4.7.1. The Configurations on z/OS4.7.2. Monoplex4.7.3. Single System with Every Tester Having Their Own Base Cell, Node, and Application Server4.7.4. Single System, Single Base Cell, Single Node with Multiple Application Servers4.7.5. Single System, Deployment Manager Cell, Any Combination of Node, Server, Cluster4.7.6. The Deployment Manager Node (Also Called a Network Deployment Installation)4.7.7. The Node Agent4.7.8. Sysplex4.7.9. Other Topology Considerations—Coexisting Installations4.8. Summary