Figure 10-2 shows the layered architecture that was introduced earlier in the book and then reintroduced in Chapter 9 in the context of databases. Again, these layers are logical and, in some cases, physical as well.
Remember that even though they are individual layers, many may run together on the same machine. At least one of them, Presentation Services, will be on the client in the form of a browser. Figure 10-3 focuses on the layers to be reviewed in this chapter, giving a more in-depth review of the roles that they will serve.