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The physical (MAC) address is an 8 byte number such as 08:00:20:9A:38:34. For that reason, the MAC address of a machine is required so that it can be properly configured for the engineering network. The MAC address is used to assign the TCP/IP address by means of DHCP (Dynamic Host Configuration Protcol). This is the actual hardware address that the lowest level of the network uses to communicate.

Every network interface has a MAC address (Media Access Controller) also known as the physical address.
