History
The BOOTP protocol was first defined in September 1985 in RFC 951 as a replacement for the Reverse Address Resolution Protocol RARP, published in RFC 903 in June 1984. The primary motivation for replacing RARP with BOOTP is that RARP was a data link layer protocol. This made implementation difficult on many server platforms, and required that a server be present on each individual IP subnet. BOOTP introduced the innovation of a relay agent, which allowed BOOTP packets to be forwarded from the local network using standard IP routing, so that one central BOOTP server could serve hosts on many subnets.
Read more about this topic: Bootstrap Protocol
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