Host, where are you?

What this ARP networking question tests

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.

• ARP request and reply frames
• Broadcast vs. unicast transmission
• Network timeout and retry semantics
• Distinction between local and remote hosts