How DHCP Works

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How DHCP Works

DHCP client configuration is a four-part process, as follows:

1.	When the DHCP client initializes, it broadcasts a request for an IP lease from a DHCP server called a DHCPDISCOVER.
2.	All DHCP servers that receive the IP lease request respond to the DHCP client with an IP lease offer known as a DHCPOFFER. This includes DHCP servers on the local network and on remote networks when the relay agent is used or a router that passes BOOTP requests.
3.	The DHCP client selects the first offer it receives and broadcasts an IP lease selection message specifying the IP address it has selected. This message is known as a DHCPREQUEST.
4.	The DHCP server that offered the selected lease responds with a DHCP lease acknowledgment message known as a DHCPACK. The DHCP server then updates its DHCP database to show that the lease can no longer be offered to other DHCP clients. The DHCP servers offering leases that were not selected can offer those IP addresses in future lease offers.

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