VLANS use one set of Physical Networking Equipment to create More Than 1 Local Area Network
In this scenario I can easily create 3 LANS one for each floor with each LAN servicing a Department
However In this scenario I have members from every Department on every floor
I could solve this with 3 sets of physical equipment
But there is a better way VLANs
VLANs allow my users to be in any Geographical/Group Layout and still use one set of equipment