本文介绍了无线网络中两种主要的扫描技术：被动扫描与主动扫描。被动扫描通过侦听无线信号来发现网络，而主动扫描则通过发送特定的SSID请求帧来定位目标网络。这两种方法都是无线客户端寻找可用网络的重要手段。
scan
The process by means of which a wireless network client finds a wireless network:
• Passive scan: walk around with a laptop looking for signals (done aggressively, this is called warchalking, wardriving, etc.) The laptop software listens for beacon frames from other wireless devices.
• Active scan: seeking a specific SSID (wireless network identifier), a laptop or other wireless device broadcasts an association request frame (also called a probe).
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