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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q54-Q59):

NEW QUESTION # 54
What makes patching in IACS environments particularly complex?

A. Patches never require testing before deployment
B. The availability of unlimited maintenance windows
C. Continuous operations and safety concerns
D. Cyber threats do not affect IACS systems

Answer: C

Explanation:
Patching in Industrial Automation and Control Systems (IACS) is complex primarily due to:
The need to maintain continuous operations
Strict safety and reliability requirements
The risk of introducing unintended consequences through updates
"Unlike IT environments, IACS patching is constrained by the requirement to maintain availability and ensure safety. Patches must be tested in staging environments and applied during maintenance windows to avoid disrupting operations."
- ISA/IEC 62443-2-3:2015, Clause 6.1 - Patch Management Process
This makes patch management a risk-based and carefully scheduled activity, not an automatic or rapid one.
References:
ISA/IEC 62443-2-3:2015 - Clause 6.1
ISA/IEC 62443-2-1:2010 - Clause 4.3.4.3 - Change Management

NEW QUESTION # 55
According to ISA/IEC TR 62443-1-5, which documents can be referenced when creating a security profile?

A. ISA/IEC 62443-2-1, 2-4, 3-3, 4-1, and 4-2
B. Only ISA/IEC 62443-3-3 and 4-1
C. Only ISA/IEC 62443-1-1 and 1-2
D. Any cybersecurity standard outside the ISA/IEC 62443 series

Answer: A

Explanation:
ISA/IEC TR 62443-1-5 provides guidance on developing and using security profiles to represent the security requirements of IACS systems. These profiles reference detailed technical and procedural requirements drawn from multiple documents in the 62443 series.
"The creation of security profiles should leverage relevant requirements and foundational elements from:
ISA/IEC 62443-2-1 (Security Program Requirements for IACS Asset Owners) ISA/IEC 62443-2-4 (Requirements for IACS Service Providers) ISA/IEC 62443-3-3 (System Security Requirements and Security Levels) ISA/IEC 62443-4-1 (Secure Product Development Lifecycle Requirements) ISA/IEC 62443-4-2 (Technical Security Requirements for IACS Components)"
- ISA/IEC TR 62443-1-5:2018, Clause 5.2
This ensures a comprehensive and layered security profile based on technical, system, and organizational controls.
References:
ISA/IEC TR 62443-1-5:2018 - Clause 5.2
Cross-referenced documents: 62443-2-1, 2-4, 3-3, 4-1, 4-2

NEW QUESTION # 56
Which is the BEST deployment system for malicious code protection?
Available Choices (select all choices that are correct)

A. Zones and conduits
B. Network segmentation
C. Application whitelistinq (AWL) OD.
D. IACS protocol converters

Answer: C

Explanation:
Application whitelisting (AWL) is a technique that allows only authorized applications to run on a system, and blocks any unauthorized or malicious code from executing. AWL is one of the most effective methods for preventing malware infections and reducing the attack surface of a system. AWL can be implemented at different levels, such as the operating system, the network, or the application itself. AWL is especially useful forindustrial automation and control systems (IACS), which often run on legacy or proprietary platforms that are not compatible with traditional antivirus software or other security solutions. AWL can also help protect IACS from zero-day attacks, which exploit unknown vulnerabilities that have not been patched or detected by security vendors. AWL is recommended by the ISA/IEC 62443 standards as a key component of malicious code protection for IACS. According to the standards, AWL should be applied to all IACS components that support it, and should be configured and maintained according to the security policies and procedures of the organization. AWL should also be complemented by other security measures, such as network segmentation, zones and conduits, and patch management, to provide a defense-in-depth approach to IACS security. References:
* ISA/IEC 62443-3-3:2013, System security requirements and security levels, Section 5.2.3.41
* ISA/IEC 62443-2-1:2010, Establishing an industrial automation and control systems security program, Section 4.3.3.6.42
* ISA/IEC 62443-4-2:2019, Technical security requirements for IACS components, Section 4.2.3.43
* ISA/IEC 62443-3-2:2020, Security risk assessment for system design, Section 7.3.3.44
* ISA/IEC 62443-4-1:2018, Product development requirements, Section 5.2.3.45

NEW QUESTION # 57
Whose responsibility is it to determine the level of risk an organization is willing to tolerate?
Available Choices (select all choices that are correct)

A. Management
B. Legal Department
C. Safety Department
D. Operations Department

Answer: A

Explanation:
According to the ISA/IEC 62443 standards, the level of risk an organization is willing to tolerate is determined by the management, as they are responsible for defining the business and risk objectives, as well as the security policies and procedures for the organization. The management also has the authority to allocate the necessary resources and assign the roles and responsibilities for implementing and maintaining the security program. The legal, operations, and safety departments may provide input and feedback to the management, but they do not have the final say in determining the risk tolerance level. References: ISA/IEC
62443-2-1:2010 - Establishing an industrial automation and control systems security program, section 4.2.1.

NEW QUESTION # 58
What is Modbus?

A. A network security standard
B. A serial communications protocol
C. A type of industrial machinery
D. A programming language

Answer: B

Explanation:
Modbus is defined as a serial communication protocol widely used in industrial environments to enable communication among devices such as PLCs, sensors, and actuators.
From ISA/IEC 62443-1-1 (Terminology, Concepts, and Models), Modbus is mentioned in the context of communication protocols:
"Many IACS use legacy communication protocols (e.g., Modbus, DNP3) that were not originally designed with cybersecurity in mind." Modbus was developed in 1979 by Modicon and operates over serial lines (RS-232, RS-485) or over Ethernet as Modbus TCP/IP. It follows a master/slave or client/server architecture.
Incorrect Options:
A). A programming language - Modbus is not a language; it's a protocol.
B). A network security standard - It lacks built-in security; it is a communication protocol, not a security standard.
C). A type of industrial machinery - It facilitates communication between machinery, but is not machinery itself.
References:
ISA/IEC 62443-1-1:2007 - "Terminology, Concepts, and Models"
Official ISA/IEC 62443 Study Guide

NEW QUESTION # 59
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