Eotnak wrote: »
Technically a NIC is Layer 1 and 2. In an exam, without further detail, when asked, "what layer does a NIC operate at" it would be layer 1. You have to choose the most appropriate answer. If the question were, "what layer does a NIC's MAC address operate at" it would be layer 2.
Consider that a router operates at ALL layers, but is considered a layer 3 device without further details.