ARP, the Address Resolution Protocol, allows devices on an Ethernet to find each other. Each device on an Ethernet network has a MAC (Media Access Control) address, also known as a hardware address. A MAC address is a unique 48-bit hexadecimal number. Any Cisco device will display the ARP table with the
show arp command.
sho arpProtocol Address Age (min) Hardware Addr Type Interface Internet 10.184.0.243 14 0019.b9f0.ace1 ARPA Vlan1 Internet 10.184.0.248 207 0004.23ce.45d7 ARPA Vlan1 Internet 10.184.0.254 ...