Sniffers that place NICs in promiscuous mode work at what layer of the OSI model?
A.
Network
B.
Transport
C.
Physical
D.
Data Link
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In networking terms, a computer having its NIC set to “promiscuous mode” receives all packets on the same network segment. In “normal mode,” NIC accepts only packets addressed to its MAC Address.
Layer 1 of OSI Model is the Physical Layer and defines the physical and electrical characteristics of the network.
The NIC cards in your PC and the interfaces on your routers all run at this level since, eventually, they have to pass strings of ones and zeros down the wire.