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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q127-Q132):

NEW QUESTION # 127
Why is OPC Classic considered firewall unfriendly?

A. It works with control devices from different manufacturers.
B. It dynamically assigns several ports.
C. It allows use of only port 80.
D. It is an obsolete communication standard.

Answer: B

Explanation:
OPC Classic uses Microsoft's DCOM (Distributed Component Object Model) for communication, which dynamically opens multiple ports, making it extremely difficult to manage with firewalls.
"OPC Classic is firewall-unfriendly because DCOM requires dynamic port negotiation, making it difficult to define consistent firewall rules."
- ISA/IEC 62443-3-3:2013, Annex A - Communication Protocols and Security Concerns This lack of port predictability presents a significant security and operational risk, which led to the development of OPC UA, which uses fixed ports and supports encryption.
References:
ISA/IEC 62443-3-3 - Annex A
OPC Foundation Security Guidelines

NEW QUESTION # 128
What are the three main components of the ISASecure Integrated Threat Analysis (ITA) Program?
Available Choices (select all choices that are correct)

A. Software development security assurance, functional security assessment, and communications robustness testing
B. Software robustness security testing, functional software assessment assurance, and essential security functionality assessment
C. Communication speed, disaster recovery, and essential security functionality assessment
D. Communications robustness testing, functional security assurance, and software robustness communications

Answer: A

Explanation:
The ISASecure Integrated Threat Analysis (ITA) Program is a certification scheme that certifies off-the-shelf automation and control systems to the ISA/IEC 62443 series of standards1. The ITA Program consists of three main components2:
* Software Development Security Assurance (SDSA): This component evaluates the security lifecycle and practices of the product supplier, such as security requirements, design, implementation, verification, and maintenance. The SDSA certification is based on the ISA/IEC 62443-4-1 standard.
* Functional Security Assessment (FSA): This component verifies the security functions and features implemented in the product, such as identification and authentication, access control, encryption, audit logging, and security management. The FSA certification is based on the ISA/IEC 62443-4-2 standard.
* Communications Robustness Testing (CRT): This component tests the resilience of the product against network attacks, such as denial-of-service, fuzzing, spoofing, and replay. The CRT certification is based on the ISA/IEC 62443-4-2 and ISA/IEC 62443-3-3 standards .
References:
* 1: ISASecure - IEC 62443 Conformance Certification - Official Site
* 2: ISASecure - IEC 62443 Conformance Certification - Official Site
* [3]: ISA/IEC 62443-4-1: Secure Product Development Lifecycle Requirements, ISA, 2018.
* [4]: ISA/IEC 62443-4-2: Technical Security Requirements for IACS Components, ISA, 2019.
* [5]: ISA/IEC 62443-4-2: Technical Security Requirements for IACS Components, ISA, 2019.
* [6]: ISA/IEC 62443-3-3: System Security Requirements and Security Levels, ISA, 2013.

NEW QUESTION # 129
Which factor drives the selection of countermeasures?
Available Choices (select all choices that are correct)

A. Foundational requirements
B. Output from a risk assessment
C. System design
D. Security levels

Answer: B

NEW QUESTION # 130
In terms of availability requirements, how do IACS and IT differ?

A. Rebooting is never acceptable in IT but tolerated in IACS.
B. IACS tolerates occasional failures while IT does not.
C. Both IACS and IT have the same availability requirements.
D. Continuous operation is expected in IT while scheduled operation is sufficient for IACS.

Answer: D

Explanation:
The ISA/IEC 62443 standards explain that continuous operation is often required in IT systems (such as data centers and online services), but for IACS environments, scheduled operation (for example, planned maintenance windows) is typically sufficient. IACS systems may accept limited downtime for maintenance, but require high availability during production runs.
Reference: ISA/IEC 62443-1-1:2007, Section 4.4.4 ("Availability in IACS and IT contexts"); Table 7 (Comparison of IT and IACS requirements).

NEW QUESTION # 131
Which activity is part of establishing policy, organization, and awareness?
Available Choices (select all choices that are correct)

A. Establish the risk tolerance.
B. Communicate policies.
C. Implement countermeasures.
D. Identify detailed vulnerabilities.

Answer: B

Explanation:
According to the ISA/IEC 62443 Cybersecurity Fundamentals Specialist course, establishing policy, organization, and awareness is one of the four steps of the IACS cybersecurity lifecycle. This step involves defining the cybersecurity policies, roles, and responsibilities, as well as communicating them to the relevant stakeholders. It also involves establishing the risk tolerance level, which is the acceptable level of risk for the organization. Communicating policies and establishing the risk tolerance are both activities that are part of this step. Identifying detailed vulnerabilities and implementing countermeasures are activities that belong to the next steps of the lifecycle, which are assessing the current situation and implementing the cybersecurity program, respectively. References: ISA/IEC 62443 Cybersecurity Fundamentals Specialist course, Module 2:
IACS Cybersecurity Lifecycle1

NEW QUESTION # 132
......

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