Although a single DHCP server can support a network of any size, it is often useful to have two. Here's what happens when a DHCP client enters the network:
1. The client broadcasts a DHCP discover message that is forwarded to DHCP servers on the network.
2. Each DHCP server that receives the discover message responds with a DHCP offer message that includes an IP address that is appropriate for the subnet where the client is attached.