DISCOVER:When a client is configured with the ip setting to obtain Ip address automatically. Then the client will search for DHCP server and the UDP Broadcast to the server about the DHCP discover

OFFER: DHCP Server will offers a scope of ip address available in the pool.

REQUEST: In response to the offer, the Client will requests for an ip address.

ACKNOWLEDGE:In response to the request, server will responds with all Ip address, Mask, Gty, Dns and wins info along with the acknowledgment packet.

Anyone has some more suggestion. You can update it.

Thanks