IEC 62443 ICSSCADA Practice Questions (Page 6)

Questions 26–30

1. 26application · medium

   A security architect is evaluating different standards for a new OT security program. The architect notes that NIST SP 800-82 provides guidelines for industrial control systems, while IEC 62443 is an international standard. Which statement correctly compares the two?

   • AIEC 62443 is a high-level framework, while NIST SP 800-82 provides detailed technical controls.
   • BNIST SP 800-82 is more specific than IEC 62443 for OT security.
   • CIEC 62443 is an international standard that can be used globally, while NIST SP 800-82 is a US-specific guideline.
   • DNIST SP 800-82 is a subset of IEC 62443.
   Reveal Solution Discussion Select an answer first
2. 27application · medium

   A security manager is comparing IEC 62443 with ISO 27001 to decide which framework to use for a new industrial control system project. The project involves a mix of IT and OT systems, and the manager needs a framework that specifically addresses the unique requirements of IACS, such as safety and real-time constraints. Which statement accurately reflects the relationship between the two standards?

   • AIEC 62443 can be used to complement ISO 27001 by providing OT-specific technical controls.
   • BISO 27001 is more detailed than IEC 62443 for OT-specific threats.
   • CIEC 62443 and ISO 27001 are interchangeable for IACS security.
   • DISO 27001 is a subset of IEC 62443 and covers only the management system part.
   Reveal Solution Discussion Select an answer first
4. 28expert · hard

   A chemical plant has a legacy control network that was designed without segmentation. The plant is now required to comply with IEC 62443. The security team has identified three zones: a control zone (SL 3), a safety zone (SL 4), and a business network zone (SL 2). The plant's budget is limited, and the team must prioritize the implementation of security controls. The safety zone contains the emergency shutdown system, which is currently connected to the control zone through a simple switch. The business network is connected to the control zone through a firewall that is already in place. Which action should the team take first to reduce the most risk?

   • AUpgrade the firewall between the business network and the control zone to a next-generation firewall.
   • BImplement application whitelisting on all control zone workstations.
   • CInstall a firewall between the control zone and the safety zone to enforce the SL 4 boundary.
   • DConduct a new risk assessment to confirm the security levels.
   Reveal Solution Discussion Select an answer first
5. 29application · medium

   A manufacturing company is adopting IEC 62443 to improve security. They have already completed a risk assessment and identified the zones and conduits. The next step is to select and implement security countermeasures, such as firewalls and access control, for the identified zones. Which IEC 62443 part provides guidance for this phase?

   • AIEC 62443-3-3, which specifies system security requirements and security levels.
   • BIEC 62443-2-1, which covers the IACS security management system.
   • CIEC 62443-1-1, which provides the terminology and concepts.
   • DIEC 62443-4-1, which covers the product development lifecycle.
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6. 30application · medium

   A manufacturing plant has a control network that includes a robotic cell and a quality inspection system. The robotic cell has a high risk of physical damage if compromised, while the quality inspection system is less critical. The plant wants to minimize the attack surface between the two systems. According to IEC 62443, what is the best approach?

   • ADisconnect the quality inspection system from the network to avoid any risk.
   • BPlace both systems in the same zone and apply the highest security level to the entire zone.
   • CUse a single flat network and rely on the security features of the robotic cell.
   • DCreate two separate zones and use a conduit with a firewall to control traffic between them.
   Reveal Solution Discussion Select an answer first