DORA STAND FOR DISCOVER OFFER REQUEST AND ACKNOWLEDGEMENT.
when we install a dhcp server into our network then dhcp server works on the basis of dora process.
first dhcp server sends a hello message in to the network to discover the clients pc and when any client pc found in the network then , dhcp server offers the IP to client pc. When client pc select any IP from dhcp server then client pc request for selected IP to dhcp server then dhcp server provide that IP to client pc and both send ackonledgement to each other.
This process is called DORA process on the basis of this process DHCP server works to provide IP's dynamically to client pc's in network.