Which of the following statements about MAC addresses are correct ? (Multiple Choice)

 Which of the following statements about MAC addresses are correct ? (Multiple Choice)
A .  Ethernet uses MAC address to identify the host
B . MAC address is a logical address that is easy to change
C . The MAC address is fixed in the ROM , usually cannot be changed
D .  Usually only the terminal host needs the MAC address, routers and other network devices do not need

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Answer:   AB

Explanation:

FLASH memory: store application program files, the configuration file IP address is in the operating system’s RAM (random access memory, used for random storage, such as the current configuration), and the MAC address is fixed in the network card ROM (read-only memory, which stores the BOOTROM program, for In the method of replying when the application or configuration file fails, the theory cannot be changed and is the only one in the world

48 -bit MAC : 24 -bit OUI (application, logo manufacturer) + 24 -bit EUI IP address hides the physical address from the upper layer, so that the internet shows a unified address format, but the actual communication ip address cannot be recognized by the physical network, and the physical network is still physical Address, so it is necessary for arp to parse out the MAC , that is, the data communication between devices must know the ip address and the MAC address