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单项选择题At a certain customer’s site， a NAS is both physically and logically in the traffic path. The NAS identifies clients solely based on their MAC addresses. In which access mode has this NAS been configured to operate？（）

A、 Layer 2 mode

B、 Layer 3 Edge mode

C、 Layer 3 Central mode

D、 Layer 3 In-Band mode

  • A

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