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System Architecture

When we introduced various architectures in Chapter 6, we said, “The architecture of a system defines its basic components and important concepts and describes the relationships among them.” Figure 21-4 shows a block diagram of a commerce system built from these components. Overall, this is a three-tier architecture with clients using Web browsers connecting over the Internet to content servers of various types. The content servers in turn use shared commerce services. The application is interconnected over the public Internet. Finally, the transaction engine connects to services off the public Internet, such as financial networks and fulfillment systems.

Figure 21-4. Commerce Architecture



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