Defining and Enforcing Architecture in .NET framework

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Defining and Enforcing Architecture
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Backup Time 18 Hrs Ethernet
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Figure 3-3 Diagramming a Web proxy network segment.
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Diagramming Logical Grouping N-Tiers
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N-tier diagrams provide logical rather than physical views. Logical groupings are made of systems and services that perform like kinds of functions. This is referred to as Nx-tier architecture, where each N represents a logical grouping or cluster and x represents the number of logical tiers in the design. In a Web hosting environment of N5, for example, tier N1 might be the Web front-end appliances performing load balancing; N2, the Web servers; N3, common services such as LDAP directories and credit card processing; N4, content services; and N5, back-end databases. The N-tier set of diagrams represents what happens within an interconnected information system, and is often employed to explain to management or to a nontechnical audience how the host systems work together or where a new application will fit into the environment. This delineation and grouping also aids other functions within the design process, including analysis for security needs. Because these diagrams are used for different audiences, they are often redrawn for simplicity to use in presentations to show how a particular application works with a degree of abstraction that reduces the amount of detail. The final level of detail needed for the more technical documents should include each specific host by name within its respective tier.
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Diagramming Device Interfaces
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Device interface diagrams get deep into the details of what is connected to each interface port on every computer, router, hub, or appliance in the network and to any other devices to which the connection is linked. The individual port connections could be called out in a table placed in the drawing on a larger diagram or be in a diagram of their own when the shear volume of connections requires a larger amount of space for the details. Device power supply panel locations and circuit numbers as well as battery backup power supplies should be referenced at this level of detail so that power problems can be easily traced for each device. Figure 3-5 shows a print server and all of the devices connected to it. Each device is labeled with the port or slot number that it connects to on the server. The laser printer in the diagram, for example, is connected to the second parallel port in slot six on the print server. Power connections for the devices are also shown with labels, such as the one for the laser printer (P2-203-1), which says the power for it is supplied through panel 2, in room 203, and that it is circuit breaker 1.
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Defining and Enforcing Architecture
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ANN ARBOR HQ Device Interface MAP/CAD Print Station Sheet 2 Revision 2 Figure 3-5 Device interfaces for a print server.
Defining and Enforcing Architecture
Diagramming Application Logic
Application logic diagrams depict an application s process logic across the entire system. The information shows the nodes where the application s data is exchanged and acted on and briefly describes what happens at those nodes. The diagram begins with the application startup and shows the points where information is keyed in, all of the program s decision points, and what other processes or applications are called for data responses, as well as at what stages those interfaces occur. It shows all of the program s operational logic right up to the final storage and output to reporting and printing. When the logical process flows are shown, analysis can be done to determine where security risks occur and what can be done from a control perspective to enhance the security protection profile for the application. Figure 3-6 illustrates the high-level application logic between hosts when an end user attempts to look up the status of an order on the company s Web site. An LDAP directory clearly is used to authenticate the user.