Respuesta :
A wireless node that is in active scanning mode transmits a probe request frame in order to find available access points.
Scanning is a method used by wireless nodes, such as computers or mobile phones, to discover open access points (APs) to connect to. A wireless node emits a probe request frame, a unique kind of frame intended to ask APs for information, when it is in active scanning mode. The SSID (service set identification) of the AP that the wireless node is looking for is included in the probe request frame along with other details about the node's capabilities and preferences.
The probe response frame that an AP sends back in response to a probe request frame includes details about the AP, including as its SSID, capabilities, and current load. This data can be used by the wireless node to identify the AP as a suitable choice for connection.
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