Which addressing method can be used to identify a specific interface on a device?

The MAC Address is used to identify a specific interface on a device because it is a unique identifier assigned to network interfaces for communications at the data link layer of a network. This address is embedded in the hardware of the network interface card (NIC) and is pivotal for the functioning of Ethernet networks. Each device on the same local network has a distinct MAC Address, allowing for accurate data transmission between devices on that local area network (LAN).

In contrast, while an IP Address is also used to identify a device within a network – specifically at the network layer – it can change if the device connects to a different network or if its configuration changes. Subnet Masks and Broadcast Addresses serve different purposes in networking. A Subnet Mask helps define the network's range, and a Broadcast Address is used to send data to all devices in a subnet rather than a single interface. Therefore, the MAC Address stands out as the definitive method for identifying a specific interface on a device.