We need RARP/function does RARP serve :
It permits a host to determine its IP address from the network. This is
useful for diskless hosts which need to configure themselves dynamically
upon bootstrap. In this scenario, the diskless host reads the MAC address
of its network adapter and sends out a RARP request for its IP address to
the network. This is typically done with a broadcast request. As such, the
RARP request is not forwarded by routers. One or more RARP servers would
then reply to the diskless host with a unicast reply providing the IP
address. Bootp provides another mechanism for doing this function. In
addition, bootp allows more data than just the IP address to be sent.
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