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The physical address length of Ethernet specified in IEEE802.3 standard is A.8 bit B.32 bit C.48 bit SD.64 bit C. IEEE 802.3 standard is based on Ethemet specification, and the typical physical address length of Ethernet is 48 bit, which can meet the requirements of all possible physical addresses of Ethernet in the world.
Information is stored in memory in bytes. In order to store or obtain information correctly, each byte unit is given a unique memory address, which is called PhysicalAddress, also called actual address or absolute address. Addresses in the network are divided into physical addresses and logical addresses. Relative to the IP address of the network layer, the port number of the transport layer and the user name of the application layer, the MAC address of the local area network is handled by hardware, which is called physical address or hardware address. IP address, port number of transport layer and user name of application layer are all logical addresses, which are handled by software. A MAC address is also called a physical address.