IEC 62443 ICSSCADA Practice Questions (Page 5)

Questions 21–25

1. 21expert · hard

   A company is in the design phase of an IEC 62443 implementation. The asset owner has defined the target security levels for each zone. The system integrator is now selecting components and designing the network. The integrator finds that a particular component is only available with a security level of SL 2, but the zone requires SL 3. What should the integrator do?

   • ASelect a different component that meets SL 3, even if it costs more.
   • BUse the SL 2 component and implement compensating measures to achieve SL 3 for the zone.
   • CAsk the asset owner to lower the target security level for the zone.
   • DProceed with the SL 2 component and document the deviation in the final report.
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2. 22application · medium

   A manufacturing company is implementing IEC 62443 for a new automated warehouse. The company has hired an external firm to design and install the control system. During the design phase, the external firm proposes a network architecture that does not include a firewall between the IT and OT networks. The company's security team is concerned. According to IEC 62443, who is primarily responsible for ensuring that the design meets the required security level?

   • AThe asset owner, because they define the security requirements and are accountable for the system's security posture.
   • BThe product supplier, because they provide the components that must meet the security level.
   • CThe system integrator, because they are responsible for the design and implementation of the system.
   • DThe maintenance provider, because they will be responsible for the system after installation.
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4. 23application · medium

   A power utility is upgrading its substation automation system. The new design includes a remote access server for vendor diagnostics. The security team wants to ensure that the vendor can only reach the diagnostic server, not the protection relays. According to IEC 62443, what is the most appropriate way to implement this?

   • AAssign the diagnostic server a higher security level than the protection relays to prevent unauthorized access.
   • BPut the diagnostic server in the same zone as the protection relays and rely on the vendor's authentication to prevent access.
   • CUse a VPN that gives the vendor full network access to the substation LAN.
   • DPlace the diagnostic server in a separate zone and use a conduit with a firewall rule that permits only the vendor's IP to the diagnostic server.
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5. 24foundation · easy

   What does Security Level 1 (SL 1) in IEC 62443 primarily protect against?

   • ASophisticated, intentional attacks by skilled adversaries
   • BInsider threats with extensive knowledge of the system
   • CNation-state sponsored cyber warfare
   • DCasual or coincidental violation
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6. 25expert · hard

   A large utility is implementing IEC 62443 across multiple sites. The project manager has assigned the following responsibilities: the asset owner defines security levels, the system integrator designs the network, and the product supplier provides certified components. During a review, it is discovered that the system integrator has been making changes to the security levels without consulting the asset owner. What is the most appropriate course of action?

   • ATerminate the integrator's contract immediately for violating the project plan.
   • BRequire the integrator to document all changes and submit them to the asset owner for approval.
   • CAllow the integrator to continue, as they have the technical expertise to adjust security levels.
   • DAsk the product supplier to verify the security levels.
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