Exam 13: Application Architecture and Modeling

A(n) ________________________________________ is a physical data flow diagram that allocates processors (clients and servers) and devices (e.g. machines and robots) to a network, and establishes (1) the connectivity between the clients and servers; and (2) where users will interact with the processors (usually only the clients).

A(n) __________________________ specifies the technologies to be used to implement one or more (possibly all) information systems in terms of data, process, interface, and how these components interact and communicate across a network.

A(n) _____________________________ system is a LAN-based solution in which a server computer hosts only the data layer. All other layers of the information system applications are implemented on the client PC.

__________________________________ truly distributes rows and columns to specific database servers with little or no duplication between servers. Different columns can be assigned to different database servers or different rows in a table can be allocated to different database servers.

The __________________________________ model the technical and human design decisions to be implemented as part of an information system. They communicate technical choices and other design decisions to those who will actually construct and implement the system.

Clean layering requires that the presentation, application and data layers of an application are physically joined.

The _________________________________ layer is where any processing is done to generate the presentation layer.

A(n) ___________________________ server hosts services for e-mail, calendaring, and other work group functionality. This type of functionality can actually be integrated into information systems applications.

A(n) ________________________________ is a self-contained collection of processes, data stores and data flows that share similar design attributes. It serves as a subset of the total system whose inputs, outputs, files and databases, and programs can be designed, constructed, and unit tested as a single subsystem.

Network computing is a fundamental shift away from client/server computing.

With file server architectures, the client PC must be fat.

What is defined by the IT architecture?

Remote procedure calls (RPCs), message queues and object request brokers are examples of presentation middleware.

The information system application layer that is the actual stored data in the database is known as:

Database middleware allows a programmer to build user interface components that can talk to web browsers or to desktop GUI.

A design unit is a self-contained collection of processes, data stores and data flows that share similar design attributes. It serves as a subset of the total system whose inputs, outputs, files and databases, and programs can be designed, constructed, and unit tested as a single subsystem.

The majority of systems have slowly evolved from on-line processing to batch processing.

A centralized system is one in which the components of an information system are located on multiple locations and computer networks.

Application middleware enables two programmer-written processes on different processors to communicate with one another in whatever way is best suited to the overall application. It is essential to multi-tier application development.

In a two-tiered system, the clients execute a minimum of the overall system's components. Only the user interface and some relatively stable or personal application logic need to be executed on the clients.