Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During a post-incident review, you discover the attacker used ARP cache poisoning on the Layer-2 process network, forcing PLC traffic through a rogue laptop and causing operator HMI timeouts. Management wants a compensating countermeasure that can be rolled out quickly without firmware upgrades or downtime. Which option BEST addresses this specific threat?

  • Enable SNMPv3 with AES-256 on all devices to encrypt management traffic.

  • Replace the unmanaged switch with a layer-3 core switch and enable OSPF authentication.

  • Deploy a vendor host-based intrusion detection agent on each PLC to monitor file integrity.

  • Configure static ARP entries on critical PLC and HMI interfaces and disable gratuitous ARP processing.

Certified Ethical Hacker (CEH)
Mobile Platform, IoT, and OT Hacking
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