Answer D is the technically correct selection. A DNS lookup resolves a name query or reverse query by asking DNS infrastructure for the matching value. In normal client use, DNS translates a hostname into an IP address so the application can connect to the destination. This aligns with Cisco CCNA 200-301 v1.1 because the exam blueprint requires engineers to recognize operational behaviour from configuration symptoms and topology requirements. DNS does not ping the destination, act as an HA redirector by default, or merely define port 53 service behaviour. Treat the distractors carefully: most are real Cisco terms, but they solve a different problem or operate at a different layer. The selected answer is the one that would be used by an engineer on the device or in the design to produce the outcome stated in the question.
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