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    What is the ARP protocol?


    The TCP/IP protocol family is divided into four layers. Different hosts in the Internet are addressed by different IP addresses through the IP layer.That is to say, the IP address and its upper layer are used as an IP address, which is a logical address (Logic Address).The data frame transmitted at the data link layer can only identify the physical address of the network card (Physical Address), and the commonly used Ethernet is a 48-bit MAC address.How do the source host get the physical address of another host when these intermediate stations are mainly hosts of another router or a router with a router function? The TCP/IP protocol family specifically designed a protocol for address resolution—- Address Resolution Protocol (ARP),


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