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Visual C#® 2012: How to Program, Fifth Edition by Harvey Deitel, Paul Deitel

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23.3. Multitier App Architecture

Web-based apps are multitier apps (sometimes referred to as n-tier apps). Multitier apps divide functionality into separate tiers (that is, logical groupings of functionality). Although tiers can be located on the same computer, the tiers of web-based apps commonly reside on separate computers for security and scalability. Figure 23.3 presents the basic architecture of a three-tier web-based app.

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Fig. 23.3. Three-tier architecture.

Information Tier

The bottom tier (also called the information tier) maintains the app’s data. This tier typically stores data in a relational database management system. For example, ...

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