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无线客户端主动扫描是通过发送什么帧获取到周围的无线网络信息的（）。
- A、Beacon 帧
- B、Probe Request 帧
- C、Authentication Request 帧
- D、Association Request 帧
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probe request/response， authentication request/response， association request/responseB
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Probe Request 帧C
Authentication Request 帧D
Association Request 帧
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