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虚拟网络技术以交换为中心，具有安全、灵活和易管理的特点。从虚拟局域网的定义出发，讨论分析了虚拟局域网特征、分类，以及当前流行的第三层交换技术；并对其应用实例进行了分析。
Virtual network technology to exchange as the center, with a safe, flexible and easy to manage features. Starting from the definition of virtual LAN, this paper discusses the characteristics and classification of virtual local area network, as well as the current popular Layer 3 switching technology. The application examples are also analyzed.