Your question is ARP Packet Analysis. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain how you would analyze ARP packets to troubleshoot network connectivity issues.
Walk through the packet capture points, fields, request and reply sequences, and host or switch checks you would use. Explain how you would distinguish a normal ARP failure from VLAN misconfiguration, duplicate addressing, stale neighbor state, or ARP spoofing.