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This Concept Map, created with IHMC CmapTools, has information related to: Chapter 2 System Models 2, Middleware software between your application and the operating system and networking on a computer. It is the layer above the operating system but below the application program that provides a common programming abstraction across a distributed system. Client/Server, Some Client/Server Architectural Patterns Common for large real-time systems and critical systems to improve performance and resilience of the system. Multiprocessor, Some Client/Server Architectural Patterns All application processing and data management by server only. Thin-Client model, Some Client/Server Architectural Patterns Server only responsible for data management. The client machine implements application logic and interactions with user. Fat-Client model, Problems for distributed systems Distributed systems can be used in many different ways by persons or systems with different objectives. Distributed systems can include a wide variety of hardware, operating systems, networks and applications. Many types of internal system problems are possible. There are many external threats that may affect a system, Problem 1, Some Client/Server Architectural Patterns There is a layer between client and server that may provide data and/or application processing. Three-tier client-server