The VoIP basics every enterprise should know
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A virtual local area network (virtual LAN) is the logical grouping of network nodes. A virtual LAN allows geographically dispersed network nodes to communicate as if they were physically on the same network.
VLANs allow network administrators to partition their networks physically and logically without having to run new cables or make major changes in their current network infrastructure.
A switch that supports VLANs allows the administrator to select which ports will participate in the VLAN. These ports are then grouped to become one VLAN, and any broadcasts or information passed among these ports will not be seen by the remaining ports on the switch.