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Which layer of the OSI model does the Network Interface Card (NIC) medium work on?
Transport
Network
Physical
Data Link
When referring to the OSI layers, a Network Interface Card, operates at Layer 2 of the network - it has a physical component, but it also has a MAC address, and when transmitting data, it includes its MAC address in the header as the Source MAC Address - this makes it Layer 2 as a device is associated with the highest level it operates on (also, per Cisco). When receiving data, the NIC is the device that decides to accept or reject (drop) the data packet based on the destination MAC address in the header.
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