Introduction to the Three-Tiered Windows DNA Model
As you recall, Windows DNA follows the classic three-tier architecture by breaking the services into three tiers: presentation, business logic, and data. These tiers are logical, not physical, tiers. This mean that all the tiers might run on one physical machine or a tier might be spread across several machines. This is the beauty of the model; it allows you more flexibility in your deployment and thus greater scalability. Within a tier you might also see sub-tiers. For example, within the business logic tier you might see it divided into a web farm tier and an application server tier. Or you might divide the interactions between services into sub-tiers. For example, Commerce Server interacting ...
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