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随着交换式网络的发展，虚拟网技术显得至关重要，文章全面介绍了ＶＬＡＮ定义，配置，ＶＬＡＮ内通信及ＶＬＡＮ间通信方法，说明了ＶＬＡＮ在交换式网络中的重要作用。
With the development of switched network, virtual network technology is very important. The article introduces the definition of VLAN, configuration, communication within VLAN and communication between VLANs in detail. It shows that VLAN plays an important role in switched networks.