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Host, where are you? is a easy quant interview question on networking.
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This is an easy foundational question about the Address Resolution Protocol, commonly asked to verify that candidates understand the mechanics of layer-2 and layer-3 communication in real networks. It checks whether you can reason clearly about what happens when a host tries to resolve an IP address that is not actually present on the local network segment.
To answer well, you need to know how ARP discovery works in practice: what an ARP request looks like, how hosts respond (or do not respond), and what the sending host does when it receives no reply. The question often leads into follow-ups about timeout behaviour, retry logic, and how upper-layer protocols handle address resolution failures.