The main objective of the slide is to draw the attention to the three tiers. Today the objective is that you will know more about the SQL tier and how to plan for that.
Planning and architecture for SharePoint Server 2010technet.microsoft.com/en-us/library/cc261834.aspx
Service Applications – What these are and why they are used.Service Applications are the most significant change in SP2010. Basically means that you can turn on and use specific functionality for various scenarios.However the architectural planning is now significantly complex.
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