Promiscuous mode is the mode that must be supported by the scanner's NIC to assist with the company's request of passive network monitoring. Promiscuous mode is a mode of operation for a network interface controller (NIC) that causes the controller to pass all traffic it receives to the central processing unit (CPU) rather than passing only the frames that the controller is specifically programmed to receive. This mode is normally used for packet sniffing, the practice of collecting and logging packets that pass through the network for further analysis, such as the analysis of traffic or bandwidth usage1. Promiscuous mode makes sure all transmitted data packets are received and read by network adapters.