我编程的谷歌Android和我想知道是否扫描无线802.11网络进行被动或主动做了什么？我的意思是：是否该设备的其实EMIT 在 WifiManager.startScan一个信标请求信号（）还是只是用于侦听接入定期发送信标点？

i am programming for google android and i wonder if the scans for wireless 802.11 networks are done passively or actively? i mean: does the device actually emit a beacon request signal on WifiManager.startScan() or does it just listen for beacons sent periodically by the access points?

推荐答案

Android的做被动扫描，它侦听信标。做一个主动扫描可以通过发送探测请求，并等待探测响应创造了不少网络拥塞的。

Android does passive scans, it listens for beacons. Doing an active scan can create a lot of congestion on the network by sending out probe requests and waiting for probe responses.