4.3.2. Multi-Tier Architecture

The architecture of modern information systems consists of three layers, as shown in Fig. 4.10. Web-based applications, such as electronic business, can also be framed in a three-tier architecture. The first layer, also called the presentation layer, embodies the user interface with the Web services. Via interpretation of HTML or XML by a browser, Web users enter data, edit data, and receive information. New interfaces are available for accessing Web services from mobile devices, such as cellular phones and Personal Digital Assistants (PDAs). The business logic layer, also known as application layer, encapsulates a collection of rules to implement the application logic. The separation of the business logic from ...

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