What is ARP & RARP?

ARP :   

The Address Resolution Protocol (ARP) is a telecommunication protocol used for resolution of network layer addresses into link layer addresses, a critical function in multiple-access networks. 

ARP is used for mapping a network address (e.g. an IPv4 address) to a physical address like an Ethernet address (also named a MAC address). 

Example :  picture the computers Matterhorn and Washington in an office, connected to each other on the office local area network by Ethernet cables and network switches, with no intervening gateways or routers

RARP :  The Reverse Address Resolution Protocol (RARP) is an obsolete computer networking protocol used by a client computer to request its Internet Protocol (IPv4) address from a computer network, when all it has available is its link layer or hardware address, such as a MAC address

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