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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q20-Q25):
NEW QUESTION # 20
What is the primary focus of Part 3-2 in the ISA/IEC 62443 series?
Answer: B
Explanation:
ISA/IEC 62443-3-2 is titled "Security risk assessment for system design" and provides a methodology for performing cybersecurity risk assessments and for the design of security zones and conduits within IACS. It describes how to identify assets, assess threats and vulnerabilities, assign Security Levels (SLs), and develop a security design based on risk.
Reference: ISA/IEC 62443-3-2:2020, Scope and Section 4.1 ("Purpose and objectives of 62443-3-2").
NEW QUESTION # 21
Which of the following is a trend that has caused a significant percentage of security vulnerabilities?
Available Choices (select all choices that are correct)
Answer: A
Explanation:
One of the trends that has increased the security risks for industrial automation and control systems (IACS) is the integration of these systems with business and enterprise systems, such asenterprise resource planning (ERP), manufacturing execution systems (MES), and supervisory control and data acquisition (SCADA). This integration exposes the IACS to the same threats and vulnerabilities that affect the business and enterprise systems, such as malware, denial-of-service attacks, unauthorized access, and data theft. Moreover, the integration also creates new attack vectors and pathways for adversaries to compromise the IACS, such as through remote access, wireless networks, or third-party devices. Therefore, the integration of IACS with business and enterprise systems is a trend that has caused a significant percentage of security vulnerabilities. References: ISA/IEC 62443 Standards to Secure Your Industrial Control System, page 1-2.
NEW QUESTION # 22
What does a demilitarized zone (DMZ) provide in network security?
Answer: D
Explanation:
A demilitarized zone (DMZ) in network architecture provides indirect (controlled and monitored) access to the Internet or untrusted networks, usually by isolating publicly accessible services (like web servers) from internal control networks. This prevents direct exposure of sensitive IACS assets to external threats. While DMZs can support secure data transfer, their primary function is segmentation and indirect access.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3; ISA/IEC 62443-1-1:2007, Section 3.2.6 (Network Security Architectures and DMZ).
NEW QUESTION # 23
Which of the following is the BEST reason for periodic audits?
Available Choices (select all choices that are correct)
Answer: D
NEW QUESTION # 24
What is TRUE regarding safety systems?
Answer: B
Explanation:
Even the most modern and sophisticated safety systems can be defeated by an attacker. This statement is validated by the discovery of malware specifically targeting safety instrumented systems (SIS), such as the
"Triton/Trisis" malware that compromised the SIS of a petrochemical plant. Safety systems, while designed as independent protection layers, are not immune to cybersecurity vulnerabilities and require specific countermeasures. Integration, such as using Modbus TCP, does not inherently reduce risk to a tolerable level without additional controls.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.2; ISA/IEC 62443-1-1:2007, Section 3.2.4; ISA/IEC 62443-
2-1:2009, Section 4.2.3.2; TRITON/TRISIS incident case studies.
NEW QUESTION # 25
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