求翻译：　VLAN相当于OSI参考模型的第二层的广播域，能够将广播风暴控制在一个VLAN内部，划分VLAN后，由于广播域的缩小，网络中广播包消耗带宽所占的比例大大降低.网络管理员通过控制交换机的每一个端口来控制网络用户对网络资源的访问,同时VLAN和第三层第四层的交换结合使用能够为网络提供较好的安全措施。是什么意思？

vlan is equivalent to the second layer of the osi reference model broadcast domain, broadcast storms can be controlled within a vlan divided vlan, due to the narrowing of the broadcast domain, the network broadcast packets consume bandwidth proportion greatly reduce the network administrator control

VLAN OSI reference model is equivalent to a layer 2 broadcast domain, to be able to broadcast a VLAN VLAN internal, after dividing, thanks to the radio of the domain in the network, broadcast packets consume the bandwidth of the proportion was significantly lower network administrator, using the con

　VLAN is equal to the OSI reference model second broadcast territory, can broadcast the storm control in VLAN, after divides VLAN, as a result of the broadcast territory reduction, in the network broadcasts the proportion which the package of consumption band width occupies to reduce greatly. The ne

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