Which of the following is an example of separation of duties as a part of system development and maintenance? Available Choices (select all choices that are correct)
Correct Answer: A
Question 27
Which of the following is the BEST reason for periodic audits? Available Choices (select all choices that are correct)
Correct Answer: C
Periodic audits are an essential part of the ISA/IEC 62443 cybersecurity standards, as they help to verify the effectiveness and compliance of the security program. According to the ISA/IEC 62443-2-1 standard, periodic audits should be conducted to evaluate the following aspects1: * The security policies and procedures are consistent with the security requirements and objectives of the organization * The security policies and procedures are implemented and enforced in accordance with the security program * The security policies and procedures are reviewed and updated regularly to reflect changes in the threat landscape, the IACS environment, and the business needs * The security performance indicators and metrics are measured and reported to the relevant stakeholders * The security incidents and vulnerabilities are identified, analyzed, and resolved in a timely manner * The security awareness and training programs are effective and aligned with the security roles and responsibilities of the personnel * The security audits and assessments are conducted by qualified and independent auditors * The security audit and assessment results are documented and communicated to the appropriate parties * The security audit and assessment findings and recommendations are addressed and implemented in a prioritized and systematic way Periodic audits are not only a means to meet regulations or adhere to a schedule, but also a way to validate that the security policies and procedures are performing as intended and achieving the desired security outcomes. Periodic audits also help to identify gaps and weaknesses in the security program and provide opportunities for improvement and enhancement. References: Periodic audits are an essential part of the ISA/IEC 62443 cybersecurity standards, as they help to verify the effectiveness and compliance of the security program. According to the ISA/IEC 62443-2-1 standard, periodic audits should be conducted to evaluate the following aspects1: * The security policies and procedures are consistent with the security requirements and objectives of the organization * The security policies and procedures are implemented and enforced in accordance with the security program * The security policies and procedures are reviewed and updated regularly to reflect changes in the threat landscape, the IACS environment, and the business needs * The security performance indicators and metrics are measured and reported to the relevant stakeholders * The security incidents and vulnerabilities are identified, analyzed, and resolved in a timely manner * The security awareness and training programs are effective and aligned with the security roles and responsibilities of the personnel * The security audits and assessments are conducted by qualified and independent auditors * The security audit and assessment results are documented and communicated to the appropriate parties * The security audit and assessment findings and recommendations are addressed and implemented in a prioritized and systematic way Periodic audits are not only a means to meet regulations or adhere to a schedule, but also a way to validate that the security policies and procedures are performing as intended and achieving the desired security outcomes. Periodic audits also help to identify gaps and weaknesses in the security program and provide opportunities for improvement and enhancement. References:
Question 28
Which organization is responsible for the ISA 62443 series of standards?
Correct Answer: B
The ISA/IEC 62443 standards series was originally developed by the International Society of Automation (ISA) and then adopted and published by the International Electrotechnical Commission (IEC) as the IEC 62443 series. The IEC is the primary international body responsible for the ongoing development, maintenance, and publication of these standards, which are recognized globally for IACS cybersecurity. ANSI is a US standards body, NIST is responsible for US federal cybersecurity frameworks, and ETSI develops telecommunications standards for Europe, but IEC is the correct answer here. Reference: ISA/IEC 62443-1-1:2007, Foreword and Scope; IEC 62443 official documentation, www.iec.ch /62443.
Question 29
When selecting a risk assessment methodology for a complex industrial automation system, which approach aligns BEST with ISA/IEC 62443 guidance?
Correct Answer: C
ISA/IEC 62443-3-2 states that while it doesn't mandate a specific risk methodology, the chosen approach must be documented, consistent, and based on a risk ranking scale that enables the comparison and prioritization of security needs. "Any documented risk assessment methodology may be used, provided it results in a repeatable risk ranking and includes asset, threat, and vulnerability evaluation." - ISA/IEC 62443-3-2:2020, Clause 6.4.1 - Risk Assessment Methodology This ensures compatibility with SL-T (Target Security Level) assignment and zone/conduit design. Flexibility is allowed, but methodology must be traceable and consistently applied. References: ISA/IEC 62443-3-2:2020 - Clause 6.4.1 ISA/IEC 62443-2-1 - Organizational guidance for risk assessments
Question 30
If an asset owner wants to improve their organization's ability to respond during a cyberattack, which of the following activities would be MOST appropriate to implement?
Correct Answer: A
ISA/IEC 62443 emphasizes preparedness and coordinated response as part of incident handling and response requirements. Step 1: Purpose of tabletop exercises Tabletop exercises simulate cyber incidents and require participants to practice decision-making, communication, escalation, and coordination without impacting live systems. Step 2: Alignment with SP Element 7 SP Element 7 focuses on incident handling and response. Tabletop exercises directly validate these processes and identify gaps before a real incident occurs. Step 3: Why other options are less effective for response readiness Password hygiene improves prevention, not response. Architecture workshops build awareness, not reaction capability. Operator anomaly drills focus on detection, not coordinated response. Step 4: Operational benefit ISA/IEC 62443 stresses that response effectiveness depends on people and processes being exercised in advance. Thus, tabletop exercises are the most appropriate activity.
