网络工作者都认为下一代局域网主干主要依赖交换技术和虚拟局域网管理技术。虚拟局域网实际是与地理位置无关的局域网的广播群,由一个端站发送的广播信息帧只能送到具有相同虚网号的其它端站,这确保非此虚网的成员收不到这些广播帧。网络管理员把相关的客户和服务器分别构成不同的虚网,同一网内的客户和服务器可以方便地频繁通信,不同的虚网之间用路由器连接,使用路由器可以滤除虚网之间不必要的广播信息。 生产厂家采用三种策略来构造和管理虚网,这三 Network workers believe that the next generation of LAN backbone mainly rely on switching technology and virtual LAN management technology. The virtual local area network is actually a geographical group of broadcast networks unrelated to local area network, the broadcast information frame sent by an end station can only be sent to the other end stations with the same virtual network number, which ensures that members not the virtual network can not receive these broadcasts frame. The network administrator forms relevant virtual networks respectively for related clients and servers, and clients and servers in the same network can conveniently and frequently communicate with each other. Different virtual networks are connected by routers, and routers are used to filter unnecessary virtual networks Broadcast information. Manufacturers use three strategies to construct and manage virtual networks, these three