DHCP operations fall into four phases: server discovery, IP lease offer, IP lease request, and IP lease acknowledgement. These stages are often abbreviated as DORA for discovery, offer, request, and acknowledgement.
Explanation:
- DHCP provides reliable IP address configuration, while reducing network administration.
- Discovery : The DHCP client broadcasts a DISCOVER message on the network subnet using the destination address or the specific subnet broadcast address. A DHCP client may also request its last known IP address
- Offer :When the server receives a DISCOVER message from a client, which is an IP address lease request, the DHCP server reserves an IP address for the client and makes a lease offer by sending a OFFER message to the client.
- Request : In response to the DHCP offer, the client replies with a REQUEST message, broadcast to the server,[a] requesting the offered address.
- Acknowledge : When the DHCP server receives the REQUEST message from the client, the configuration process enters its final phase. The acknowledgement phase involves sending a ACK packet to the client.
