What is difference between ARP and RARP?

Address Resolution Protocol (ARP) provides a completely different function to the network than Reverse Address Resolution Protocol (RARP). ARP is used to resolve the Ethernet address of a NIC from an IP address in order to construct an Ethernet packet around an IP data packet. This must happen in order to send any data across the network. Reverse address resolution protocol (RARP) is used for disk less computers to determine their IP address using the network.

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