Sniffer turns the NIC of a system to the promiscuous mode so that it listens to all the data transmitted on its segment. It can constantly read all information entering the computer through the NIC by decoding the information encapsulated in the data packet. Passive sniffing is one of the types of sniffing. Passive sniffing refers to:

The right answer will be "Sniffing through a hub".

Explanation:

Packet sniffer seems to be a device that listens for transmitted data on what seems like a channel. Sniffing enables the detection of data by individual people as it has been transferred throughout a cable. Appropriate nodes are using this methodology to make a diagnosis of connection issues, or even just harmful programs to obtain confidential information, like authentication and encryption.

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