What is the role and purpose of the physical MAC address in computer networks?

The physical MAC address (Media Access Control) is a unique identifier of a device's network interface at the data link layer of the OSI model. It is assigned by the manufacturer and serves for unambiguous device identification in a local network.

Main roles of MAC address:

• Ensuring device uniqueness within a local network.
• Used for addressing Ethernet frames, i.e., data transfer between devices on the same network segment.
• Allows switches and other network devices to direct traffic to the correct physical address.

Example: when a computer sends data in a local network, it specifies the MAC address of the recipient so that the switch can deliver the frame to that device.