RARP reply carry only hardware and protocol addresses (RFC 930).BOOTP (and DHCP) provide additional pieces of information like netmask, gateway address, domain servers' address and other attibutes in the reply packets.

On a LAN, each host accept or deny the layer 2 frame based on destination MAC address. It will accept its own MAC address(es) and multicast addresses; with broadcast address being a special case of multicast addresses.ARP request use a MAC broadcast ...