A network analyst is investigating a report of intermittent connectivity from a workstation. The workstation's IP address is 192.168.10.55/24, and the default gateway is 192.168.10.1. During the capture, the analyst sees repeated ARP requests from the workstation asking 'Who has 192.168.10.1?' but no ARP replies. What is the most likely cause of the workstation's connectivity issue?

The gateway is dropping ICMP echo requests, so the workstation cannot confirm reachability.

The gateway's MAC address is not in the workstation's ARP cache, and the gateway is not responding to ARP requests.

The workstation's ARP cache is full, so it cannot store the gateway's MAC address even after receiving a reply.

The workstation is using an incorrect subnet mask, causing it to send ARP requests for a remote host instead of the gateway.

GIAC Network Forensic Analyst

Domain 1Objective 1

Common Network Protocols GNFA Practice Questions (Page 12)

Part of the Network Fundamentals and Architecture domain, which makes up ~26% of our current practice bank. GIAC (SANS) does not publish an official question count, but from its 180-minute exam (~70–120 total, ~18–31 in this domain), expect 9–16 from this objective — we provide 56 practice questions to prepare you well beyond it. (estimate)

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Questions 56–56

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A network analyst is investigating a report of intermittent connectivity from a workstation. The workstation's IP address is 192.168.10.55/24, and the default gateway is 192.168.10.1. During the capture, the analyst sees repeated ARP requests from the workstation asking 'Who has 192.168.10.1?' but no ARP replies. What is the most likely cause of the workstation's connectivity issue?
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Common Network Protocols GNFA Practice Questions (Page 12)

Questions 56–56

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