Probe response frames are sent to clients to answer probe request frames. It contains information about the requested network. A probe request frame is sent from a client when it wants to connect to a wireless network. Probe request frames are almost the same as the beacon frames. Clients use the flow of beacon frames to monitor the signal strength of their access point. Each frame contains the BSSID, the SSID, and some information on basic authentication and encryption. They advertise the existence and basic configuration of the network. Beacon frames are used primarily in reconnaissance. Some information on management frames will be helpful to better understand what programs for reconnaissance do. Control frames manage access to the ether and prevent access points and clients from interfering with each other in the ether. Management frames maintain both network configuration and connectivity. Data frames convey the real data, and are similar to those of Ethernet. Ĩ02.11 networks use data frames, management frames, and control frames. This configuration is an independent basic service set or IBSS. Each node connects in a peer-to-peer way. Ad hoc networks have no access point for central coordination. To obtain access to an access point, both the BSSID and the SSID are required. Access points may determine which clients may connect, and when clients do, they are said to be associated with the access point. They relay traffic from one wireless client to another. Access points broadcast a signal regularly to make the network known to clients. 
This configuration allows wireless clients to connect to each other directly, without an access point as a central manager.
An independent basic service set or IBSS is the ad hoc configuration. An extended service set is a configuration with multiple access points and roaming capabilities for the clients. A basic service set consists of one access point and several wireless clients.Each access point is part of an extended service set or ESS, which is identified by an ESSID or SSID in short, usually a character string.A BSS is identified by a BSSID, usually the MAC address of the access point. Each access point constitutes a network that is named a basic service set or BSS.Infrastructure networks are composed of one or more access points that coordinate the wireless traffic between the nodes and often connect the nodes to a wired network, acting as a bridge or a router. By default, people refer to infrastructure networks. 802.11 networks are either infrastructure networks or ad hoc networks.This is a set of standards defined by the Institute of Electrical and Electronics Engineers. Wireless local-area networks are based on IEEE 802.11.
5 Reconnaissance of the local-area network. 4.5 MAC address filtering and its attack. 4.1.2 Wi-Fi Protected Access (WPA/WPA2).
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