In a switched network, you might have different user groups like management, tech support, payroll and device groups like printers, workstations or access points. By default, all interfaces on a switch are able to communicate with each other so it’s difficult to make a separation unless you use a different physical switch for each group of users/devices. VLANs allows us to create virtual groups on our switch. We assign interfaces to different groups and only the interfaces in the same group are able to communicate with each other. These lessons explain what VLANs are and how to configure them.