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Software Fortresses: Modeling Enterprise Architectures by Janet Van Sickler, Roger Sessions

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Chapter 7. Guards and Walls

At first glance, guards and walls seem to have paradoxical functions. Walls are designed to block access to the fortress. Guards are designed to allow access to the fortress. These two functions, however, are actually complementary. The efficacy of the walls is what makes the guard's job necessary. After all, if outsiders could send requests into the fortress any which way they wanted, there wouldn't be much incentive to use approved and guarded drawbridges.

Although charged with allowing access to the fortress, the guard is very selective. The fortress architect is responsible for deciding just how selective the guard will be and which technologies can be used to implement this selectivity.

In this chapter I discuss ...

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