To solve this problem, Ethernet requires that each computer has a unique Media Access Control address, or MAC address.
为了解决这个问题,以太网要求每台计算机都有一个唯一的媒体访问控制地址,即 MAC 地址。
英语百科
MAC address
A media access control address (MAC address), also called physical address, is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and WiFi. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model.