what is a VLAN
VLAN (Virtual Local Area Network) is a logical local area network (or LAN) that extends beyond a single traditional LAN to a group of LAN segments, given specific configurations. Since a VLAN is a logical entity, its creation and configuration is done completely in software.here are only two types of VLAN possible today, cell-based VLANs and frame-based VLANs. 1  Cell-based VLANs are used in ATM switched networks with LAN Emulation (or LANE). 2  Frame-based VLANs are used in Ethernet networks with frame tagging.