IEC 62443 ICSSCADA Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which part of the IEC 62443 standard provides common terms, concepts, and models used throughout the series?

   • APart 1-1: Concepts and models
   • BPart 4-2: Technical security requirements for IACS components
   • CPart 2-1: Security program requirements for IACS asset owners
   • DPart 3-3: System security requirements and security levels
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2. 17application · medium

   A manufacturing plant has just completed a risk assessment and designed a new segmented network architecture. The next phase is to implement the security controls. According to IEC 62443, what is a key responsibility of the system integrator during the implementation phase?

   • ADefine the target security level for each zone.
   • BDevelop the overall security management system policy.
   • CConduct the initial risk assessment.
   • DEnsure that the implementation follows the design and that security requirements are met.
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4. 18application · easy

   A chemical plant has been operating for years without a formal cybersecurity program. The new plant manager wants to align with IEC 62443. The first step is to understand the current state of the plant's ICS security. Which IEC 62443 activity should be performed first?

   • AConduct a risk assessment to identify threats, vulnerabilities, and potential consequences.
   • BImplement security monitoring and incident response procedures.
   • CSelect a certification body to audit the plant against IEC 62443.
   • DDesign a target architecture using zones and conduits.
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5. 19expert · hard

   A pharmaceutical company is designing a new production line. The asset owner has set a target security level of SL 3 for the entire system. However, the system integrator points out that some legacy components can only achieve SL 2. The asset owner is concerned about the cost of replacing these components. What is the best course of action according to IEC 62443?

   • AAccept the risk and operate the system at SL 2 for the affected components.
   • BImplement compensating measures, such as additional monitoring and access controls, to raise the effective security level of the legacy components to SL 3.
   • CLower the target security level for the entire system to SL 2.
   • DReplace all legacy components with new ones that meet SL 3.
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6. 20application · medium

   A water treatment facility is adding a new remote monitoring service that will allow a third-party vendor to view historical sensor data. The vendor does not need direct access to the control network. The facility's ICS network currently has a single flat segment containing both the HMI/SCADA servers and the field devices. The security team wants to minimize the vendor's ability to reach control systems while still providing the required data. Which approach best aligns with IEC 62443 zones and conduits?

   • ACreate a separate zone for the vendor access, place a read-only historian in that zone, and connect it to the control zone through a conduit with a firewall rule that only allows historian-to-vendor traffic.
   • BConfigure the vendor's system as a new conduit directly attached to each field device, allowing it to read sensor data without crossing the control zone.
   • CAssign the vendor's system a Security Level of SL 4 and place it in the same zone as the HMI to ensure the highest protection.
   • DAdd the vendor's monitoring system to the existing flat segment and rely on the HMI's user authentication to prevent unauthorized access.
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