B, A, D, C
The HCIA-Datacom V2.0 Training Material explains that DHCP clients obtain IP addresses through four stages: Discovery, Offer, Request, and Acknowledgment.
In stage 1, the client broadcasts a DHCP DISCOVER message to locate available DHCP servers because it does not yet know the server ' s IP address.
In stage 2, a DHCP server responds with a DHCP OFFER containing an available IP address and other configuration parameters.
In stage 3, the client broadcasts a DHCP REQUEST to indicate the selected server and requested address.
Finally, in stage 4, the selected server sends a DHCP ACK confirming the allocation.
This four-stage process is commonly called DORA: Discover, Offer, Request, and Acknowledge.
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