Sniffers operate at the data link layer of the OSI model, which means they do not have to play by the same rules as the applications and services that reside further up the stack. Sniffers can capture everything on the wire and record it for later review. They allow user’s to see all of the data contained in the packet. While sniffers are still a powerful tool in the hands of an attacker, they have lost some of their mystical status as many more people are using encryption.
https://www.sciencedirect.com/topics/computer-science/protocol-analyzer11
Answer is C
Sniffers operate at Layers 2 and 3 of the OSI model. Layer 2 provides for physical addressing and framing (MAC addresses, Ethernet frames, and so on) and Layer 3 handles the packets and payloads (IP addressing and such).
sniffer operate on layer 2 and 3 of the OSI model, true is C
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