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ARP ARP ARP is a cooked quant interview question on networking.
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This is a foundational networking question that appears in technical interviews for infrastructure and systems roles. It probes whether you understand the core purpose and operation of the Address Resolution Protocol—one of the essential mechanisms that enables communication on local networks.
The question rewards clarity on the relationship between network-layer and link-layer addressing, and on how hosts discover the physical (MAC) addresses they need to send frames to their neighbours. A strong answer articulates the problem ARP solves and explains when and why it is invoked in a real communication scenario.