The Address Resolution Protocol, or ARP(Address Resolution Protocol), is a TCP/IP Protocol that obtains physical addresses based on IP addresses.When sending information, the host will broadcast the ARP request containing the target IP address to all hosts on the local area network, and receive the return message to determine the physical address of the target;After receiving the return message, the IP address and physical address will be stored in the local ARP cache and reserved for a certain time. The next request will directly query the ARP cache to save resources.