Connections to Common Services

As was briefly mentioned in Chapter 1, "Hierarchical Design Principles," common use resources, such as server farms and connections to the Internet, can be connected directly to the core of the network or through a DMZ. If these common services are attached directly to the core, the most visible single point of failure will be the network these common services are attached to. Side A of Figure 3-13 illustrates this single point of failure.

Figure 3-13. Redundancy to Common Shared Resource, Such as a Server Farm

In the network illustrated by Side B of Figure 3-13, the server farm has been connected to two core ...

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