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ccna 200 301 booksmart film sa.3. thenThe DHCP client then sends a DHCP Request message in broadcast form, which is used to request an IP address and other information.The DHCP server finally completes the interaction as a unicast, returning a DHCPAcknowledgment message to the DHCP client.Figure 4.3 DHCP client four-step processDHCP ConflictA DHCP address conflict occurs when two hosts use the same IP address. This sounds a bit unconvincing doesn't it? Well, of course it does!In the process of assigning IP addresses, the DHCP server checks for IP address conflicts by pinging and assigns the IP addresses from the address pool only after confirming that they are available. If no host responds to the ping, the DHCP server assumes that the IP address has not been assigned. This helps the server confirm that it has provided an address that is not in question, so what can the host do? To provide an additional layer of protection against address conflict problems, hosts can broadcast their own addresses.The host uses a technique called Gratuitous ARP (no cause ARP) to avoid potential address conflict problems. The DHCP client uses its newly acquired IP address to send an ARP broadcast across the local LAN or VLAN, which can eliminate the potential problem before an address conflict occurs.If an IP address conflict is detected, the address is removed from the DHCP address pool (address range). One very important point: this address can be reassigned to a host only after the administrator has manually resolved the conflict.Automatic Private IP Addressing