IEC 62443 ICSSCADA Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A large utility is adopting IEC 62443. The security team has completed the risk assessment and defined zones and conduits. However, the team is struggling with the maintenance phase because they have limited staff and budget. The asset owner wants to ensure that the security levels are maintained over time without overburdening the team. Which approach is most aligned with IEC 62443?

   • ARely on the original risk assessment and do not change anything until a security incident occurs.
   • BSet a fixed schedule for re-certification of all components every three years.
   • CImplement continuous monitoring and periodic reviews of security controls, with a formal re-assessment only when significant changes occur.
   • DPerform a full risk assessment every year to identify any changes.
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2. 12application · medium

   A system integrator is contracted to upgrade the control system of a power plant. The asset owner has provided the security requirements and the target security level for each zone. During the project, the integrator discovers that a component from a product supplier does not meet the required security level. According to IEC 62443, what is the most appropriate action for the system integrator?

   • AInform the asset owner and work with the product supplier to find a compensating measure or a compliant alternative.
   • BIgnore the issue because the product supplier is responsible for the component's security.
   • CProceed with the installation and document the deviation in the final report.
   • DReplace the component with a similar one from another supplier without consulting the asset owner.
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4. 13expert · hard

   A power generation company is in the maintenance phase of the IEC 62443 security lifecycle. They have implemented all required security controls and achieved the target security levels. However, a recent audit found that several security patches have not been applied to the HMI servers because the patches would require a system reboot, which is not allowed during peak production. The plant manager wants to maintain compliance. What is the best approach?

   • AIgnore the patches because the system is already at the target security level.
   • BApply the patches during the next scheduled maintenance window, even if it is several months away.
   • CApply the patches immediately, even if it causes an unplanned outage.
   • DImplement compensating controls, such as network segmentation and application whitelisting, to mitigate the risk until patches can be applied.
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5. 14foundation · easy

   What is the role of a conduit in the IEC 62443 zones and conduits model?

   • AIt defines the security level of a zone
   • BIt represents the communication path between zones and must be secured accordingly
   • CIt groups assets with similar security requirements
   • DIt is a physical cable that connects devices
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6. 15foundation · easy

   Which security level in IEC 62443 is intended to protect against intentional attacks by individuals with moderate resources and skills?

   • ASL 4
   • BSL 1
   • CSL 2
   • DSL 3
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