Not all networks require a three-layer
hierarchy. A key design decision becomes the placement of servers:
They can be distributed across multiple LANs or concentrated in a
central server farm location. The figure shows a distributed server design. A
one-layer design is typically implemented if there are only a few
remote locations in the company, and access to applications is mainly
done via the local LAN to the site file server. Each site is its own
broadcast domain.
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