VLAN means : we divide a Local Area Network logically into multiple smaller networks.
In LAN, workstations are connected through a hub or a repeater. These devices propagate incoming data throughout a network. If two people send data at the same time, then a collision occurs and all the transmitted data is lost. But, to prevent the collision from further travel to all workstations, a bridge or switch is used.
The workstations, hubs, and repeaters together form a LAN segment : known as a collision domain since collisions remain within the segment.
VLAN’s allow a network manager to logically segment a LAN into different broadcast domains : workstations do not have to be physically located together. Users on different floors of the same building, or even in different buildings, can now belong to the same LAN.
