To display only open networks, you can use = 0 filter. This information is carried in the Fixed Parameters Set of each beacon frame.
If the WiFI access point is OPEN and no encryption or authentication is enabled, it will have privacy bit in the capabilities flag unset. To display all the beacon frames, you can use wlan.fc.type = 0x0 & wlan.fc.type_subtype = 0x8 filter. The type of management frame type is 0x0 and subtype of the beacon frame is 0x8, in the wireshark you can use the wlan.fc.type_subtype filter variable for this. This is a subtype management frame which contains the information about the WiFi and instructions to establish connection with it. Your WiFi access point broadcasts the beacon frame in the air medium after a specific interval of time which can be configured in the settings page as well. Q1 What is the name of the Open (No Security) SSID present in the packet dump? The labs are using pretty older version of the Wireshark, logical operators combinations of the filters may vary, but the field names are hardly changed.
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