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One common motivation for using VLANs tends
to get network administrators excited. Unfortunately, reality quickly
meets enthusiasm, revealing errors in motivation. The advent of VLANs
led many to believe that a network administrator's life would be
simplified.
Administrators thought that VLANs would eliminate the need for routers,
everyone could be placed in one giant flat network, and administrators
could go home at reasonable hours each evening. This turns out to be far
from the truth. VLANs do not eliminate Layer 3 issues. They may allow you to more easily perform some Layer 3 tasks, such as
developing simpler access lists, but Layer 3 routing still must exist.
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