Because e-commerce is the primary objective of this module, the balance between access and security must be carefully weighed. Splitting the e-commerce transaction into three components allows the architecture to provide various levels of security without impeding access.
Figure B-26. E-Commerce Traffic Flow
Web server— acts as the primary user interface for the navigation of the e-commerce store
Application server— is the platform for the various applications required by the Web server
Database server— is the critical information that is the heart of the e-commerce business implementation
Firewall— governs communication ...