VLAN(Virtual Local Area Network)即虚拟局域网,是网络设备上连接的不受物理位置限制的用户的一个逻辑组。在一个VLAN上的设备或用户可以按功能、部门、应用等等分类,而不管它们的物理段位置。VLAN创建了不限于物理段的单一广播域,并可以像一个子网一样对待。VLAN技术允许网络管理者将一个物理的LAN逻辑地划分成不同的广播域(或称虚拟LAN,即VLAN),每一个VLAN都包含一组有着相同需求 Virtual Local Area Network (VLAN) is a logical group of users connected to network devices that are not physically restricted. Devices or users on a VLAN can be categorized by function, department, application, etc. regardless of their physical segment location. VLANs create a single broadcast domain that is not limited to physical segments and can be treated like a subnet. VLAN technology allows network managers to logically divide a physical LAN into different broadcast domains (or virtual LANs, or VLANs), each containing a group of servers that have the same requirements