[多选题]关于VLANs说法正确的两项是（）

A、VLANs用来分开同一以太网连接下不同数据流
B、—个VLAN是一组属于同一广播域下的交换机端口
C、一个VLAN是一组交换机，这些交换机表现的不连接
D、在以太网中VLANs用于防止环路

参考答案： A | B

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