RARP Frame
A RARP packet has the same structure as an ARP packet but it contains different pieces of information.
Notice on the next slide, the IP header does not have a specific destination or source IP address in the RARP frame.
The destination MAC and IP are broadcast addresses and the source IP is left at zero (undefined). This is because the diskless source host does not know its own IP address or the MAC or IP address of the RARP server.