If traffic flows are predictable enough that the network can be designed to keep 70 to 80 percent of the traffic within specific logical groups,virtual LANs (VLANs) can be used to create these logical groups.

• 如果流量能预测的程度足以设计在特定的逻辑组内保持70%25至80%25的流量的网络，那么虚拟局域网（VLAN）就可被用来建立这些逻辑组。