312-49 · Question #442
Sniffers that place NICs in promiscuous mode work at what layer of the OSI model?
The correct answer is C. Physical. In some exam frameworks, sniffers that place NICs in promiscuous mode are classified as operating at the Physical layer (Layer 1) because promiscuous mode causes the NIC to capture all signals on the physical medium without any MAC address filtering - essentially reading every…
Question
Sniffers that place NICs in promiscuous mode work at what layer of the OSI model?
Options
- ANetwork
- BTransport
- CPhysical
- DData Link
How the community answered
(27 responses)- A4% (1)
- C93% (25)
- D4% (1)
Explanation
In some exam frameworks, sniffers that place NICs in promiscuous mode are classified as operating at the Physical layer (Layer 1) because promiscuous mode causes the NIC to capture all signals on the physical medium without any MAC address filtering - essentially reading every bit transmitted on the wire. Note: Technically, many networking authorities classify packet sniffing at the Data Link layer (Layer 2) since frames carry MAC addresses. However, in the context of this exam, the rationale is that the NIC bypasses all normal Layer 2 filtering and captures raw traffic at the physical medium level, making Physical layer the intended answer.
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