What types of addresses operate at the OSI model's data link layer?

At the OSI model's data link layer, physical addresses called MAC addresses (Media Access Control) are used. These are unique identifiers for network interfaces, used for data transmission within a local network.

Main types of addresses at the data link layer:

• MAC addresses — unique 48-bit addresses assigned to network devices (e.g., network cards).
• Data link layer protocol addresses, for example, some networks may use other address formats, but in Ethernet and most modern networks, it is specifically MAC.

MAC addresses are used to identify the source and destination of frames within a single physical network, ensuring data delivery at the data link layer.