In a double tagging attack, an attacking host connected on a 802.1q interface prepends two VLAN tags to packets that it transmits. The packet (which corresponds to the VLAN that the attacker is really a member of) is forwarded without the first tag, because it is the native VLAN. The second (false) tag is then visible to the second switch that the packet encounters. This false VLAN tag indicates that the packet is destined for a target host on a second switch. The packet is then sent to the target host as though it originated on the target VLAN bypassing the network mechanisms that logically isolate VLANs from one another. However, this attack allows to send packets toward the second switch, but possible answers are not forwarded to the attacking host.