ABSTRACT
VLAN is virtual local area network or virtual LAN. VLAN Trunk [7] is the key and dicult points in the VLAN. In one Switch, we can make the switch port mode of all the ports in the same VLAN as Access, and the hosts in the same VLAN can connect with each other with those ports. However, in the dierent Switches or Switch to Router, we need make the switch port mode of all the ports in the same VLAN as Trunk. VLAN Trunk Line is to connect the dierent Switches or Switch to Router, and allow all the hosts in the same VLAN to communicate with each other.
