Describe the four DHCP discovery and offer messages in sequence of operation and function.

Describe the four DHCP discovery and offer messages in sequence of operation and function.

The four DHCP messages in sequence are as follows:

DHCPDISCOVER message:

• A broadcast is forwarded by the host looking for a DHCP server.
• Messages are forwarded to the DHCP BOOTP server using UDP port 67.

DHCPOFFER message:

• When the DHCPDISCOVER message reaches the DHCP server, the server responds with a unicast DHCPOFFER message containing the client’s MAC address, offered IP address and mask, default gateway, and the server’s IP address.
• Messages are forwarded to the DHCP BOOTP client using UDP port 68.

DHCPREQUEST message:

• Used for two purposes: to initially negotiate an IP address lease, and to renegotiate (or renew) the IP address halfway through its lease time.
• The client broadcasts the DHCPREQUEST message to the DHCP server using UDP port 67.

DHCPACK message:

• Is nearly identical to the original DHCPOFFER but is sent to the client to confirm that it now can use that address using UDP port 68.

Exam with this question: EWAN v4 Chapter 7 Check Your Understanding: IP Addressing Services