Select this option to add this virtual Ethernet adapter to additional virtual Local Area Networks (LANs) as specified in the IEEE 802.1Q network standard. Selecting this option allows you to specify additional virtual LAN IDs on this window.
Not all versions of all operating systems support the IEEE 802.1Q network standard. If the operating system does not support the IEEE 802.1Q network standard, the virtual Ethernet adapter connects to only one virtual LAN (as identified by VLAN ID).