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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q124-Q129):

NEW QUESTION # 124
What is Modbus?

Answer: A

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 # 125
Multiuser accounts and shared passwords inherently carry which of the followinq risks?
Available Choices (select all choices that are correct)

Answer: D


NEW QUESTION # 126
What is the primary purpose of the NIST Cybersecurity Framework (CSF)?

Answer: B

Explanation:
The NIST Cybersecurity Framework (CSF) was developed to enhance the security and resilience of critical infrastructure in the United States by providing a flexible, repeatable, and cost-effective risk-based approach to managing cybersecurity risk. It is designed to complement, not replace, existing standards and guidelines, and is intended for voluntary adoption by critical infrastructure organizations.
Reference: ISA/IEC 62443-1-1:2007, Section 4.2.7; NIST CSF Framework Core, "Purpose and Scope" (NIST CSF 1.1, Section 1.0).


NEW QUESTION # 127
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)

Answer: A


NEW QUESTION # 128
How can defense in depth be achieved via security zones?

Answer: B

Explanation:
Defense in depth is a core concept of ISA/IEC 62443, and security zones are a structural method to implement it. According to ISA/IEC 62443-3-2 and 62443-1-1, layering can be achieved by nesting zones - creating zones within zones (i.e., subzones) - to enhance protection through multiple barriers.
"Defense in depth is realized through segmentation into zones and conduits. A zone may contain subzones to establish additional layers of security, providing multiple barriers to intrusion."
- ISA/IEC 62443-3-2:2020, Clause 5.3.2 - Zone and Conduit Model
This layered zoning approach enables tiered security controls, reducing the impact of breaches and limiting lateral movement within a network.
References:
ISA/IEC 62443-3-2:2020 - Clause 5.3.2
ISA/IEC 62443-1-1:2007 - Security Zones and Conduits


NEW QUESTION # 129
......

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