DHCP Acknowledge is ...?

• A. Client accepting the offer.
• B. Server confirming assignment.
• C. Server offering an IP address.
• D. A client requesting an IP address.

Answer: (B)

DHCP uses a Discover–Offer–Request–Acknowledge exchange. The Acknowledge is the server’s confirmation that the IP address (and other configuration) has been allocated to the client after the client has requested it. It finalizes the lease, conveying the IP, subnet mask, gateway, DNS, and lease duration to the client. It’s not the client accepting the offer (that’s the Request), not the server offering the IP (that’s the Offer), and not the client requesting (that’s the Request as well). The Acknowledge signals that the assignment is successful; if something mismatches, the server might respond with a DHCPNAK instead.