Definitions for "RARP"
Reverse Address Resolution Protocol This protocol makes life easier to change IP addresses on machines. For all the machines on a network to see one another, they must know the others' IP addresses. If the IP address of one machine changes, the change must be done on each of the other machines. This would take a million years, so enters RARP which makes it possible to manage changes centrally and broadcast them to the other machines. RARP looks for an IP address when given a hardware address (the opposite of ARP).
Reserved Address Resolution Protocol, the TCP/IP protocol that allows a computer that has a Physical layer address such as Ethernet address but does not have an IP address to request a numeric IP address from another computer on the network.
Reverse Address Resolution Protocol is a method of mapping the physical Ethernet address to the IP address of the host.