One common feature of virtual private LANs is their capability of managing traffic. This makes them very useful for controlling the flow of data in the network. The Virtual Private LAN is one of the most commonly used switches and routers within small and medium-sized businesses (SMBs). The primary function of this switch is to create virtual access control zones or virtual-dedicated networks. Each VPL acts as its own private IP network, which allows them to perform the functions of more complex physical IP networks.