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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q23-Q28):

NEW QUESTION # 23
Which is the PRIMARY reason why Modbus over Ethernet is easy to manaqe in a firewall?
Available Choices (select all choices that are correct)

A. Modbus has no known security vulnerabilities, so firewall rules are simple to implement.
B. Modbus uses a single master to communicate with multiple slaves usinq simple commands.
C. Modbus is a proprietary protocol that is widely supported by vendors.
D. Modbus uses explicit source and destination IP addresses and a sinqle known TCP port.

Answer: D

Explanation:
According to the ISA/IEC 62443-2-4 standard, a training and security awareness program should include all personnel who have access to the industrial automation and control system (IACS) or who are involved in its operation, maintenance, or management. This includes vendors and suppliers, employees, temporary staff, contractors, and visitors. The purpose of the program is to ensure that all personnel are aware of the security risks and policies related to the IACS, and that they have the necessary skills and knowledge to perform their roles in a secure manner. The program should also cover the roles and responsibilities of different personnel, the reporting procedures for security incidents, and the best practices for security hygiene. References:
ISA/IEC 62443-2-4:2015 - Security for industrial automation and control systems - Part 2-4: Security program requirements for IACS service providers1 ISA/IEC 62443 Cybersecurity Fundamentals Specialist Training Course2

NEW QUESTION # 24
Which term refers to legally enforceable rules created by government bodies or authorized organizations?

A. Regulations
B. Standards
C. Frameworks
D. Special Publications

Answer: A

Explanation:
In cybersecurity governance, the term regulations refers to legally binding and enforceable rules that are established by government authorities or regulatory agencies. These differ from standards (which are often voluntary) and frameworks (which offer guidance).
"Regulations are legal requirements issued by government entities and must be followed. Noncompliance can result in legal penalties, fines, or operational restrictions."
- ISA/IEC 62443-1-1:2007, Glossary and Definitions
ISA/IEC 62443 standards are often used to support compliance with regulations but are themselves not regulations unless adopted into law.
References:
ISA/IEC 62443-1-1:2007 - Glossary: "Regulation"
ISA/IEC 62443-2-1 - Section on Regulatory Compliance

NEW QUESTION # 25
What is the name of the missing layer in the Open Systems Interconnection (OSI) model shown below?

A. Transport
B. Control
C. Protocol
D. User

Answer: A

Explanation:
The OSI model defines 7 layers for standardizing communications in network systems. The Transport Layer is responsible for reliable data transfer between end systems, including flow control, error correction, and segmentation. It sits between the Network Layer and the Session Layer.
The correct OSI model from top to bottom is:
Application
Presentation
Session
Transport # Missing layer
Network
Data Link
Physical
"The transport layer provides transparent transfer of data between end users, ensuring complete data transfer."
- ISA/IEC 62443-3-3:2013, Annex A - Communications Stack and Layered Security Concepts Understanding the OSI model is crucial when designing secure industrial networks, as ISA/IEC 62443 advocates for layered defense ("defense in depth") at all levels.
References:
ISA/IEC 62443-3-3:2013 - Annex A
ISA/IEC 62443-1-1:2007 - Section on OSI Reference Model

NEW QUESTION # 26
A company discovers malware on a portable USB device used within their IACS environment. According to the document, which SP Element and controls would be MOST relevant to address this issue?

A. SP Element 7 - Incident handling and response
B. SP Element 2 - Asset inventory baseline
C. SP Element 4 - Component hardening and dedicated portable media
D. SP Element 1 - Processes for discovery of security anomalies

Answer: C

Explanation:
According to ISA/IEC 62443-2-1, SP Element 4 is focused on system integrity and includes controls such as component hardening and managing dedicated portable media (e.g., USB drives). These controls help mitigate malware risks from removable devices.
"SP Element 4: System integrity. This element includes controls for system hardening and the use of dedicated, protected portable media to reduce infection risk and prevent unauthorized software installation."
- ISA/IEC 62443-2-1:2010, Clause 4.3.4 - SP Elements
While SP Element 7 (Incident Handling) may be involved post-discovery, the primary preventive control is under SP Element 4.
References:
ISA/IEC 62443-2-1:2010 - Clause 4.3.4, Table 2 - SP Element 4
ISA/IEC 62443-2-4 - Security controls for service providers managing portable devices

NEW QUESTION # 27
After receiving an approved patch from the JACS vendor, what is BEST practice for the asset owner to follow?

A. If no problems are experienced with the current IACS, it is not necessary to apply the patch.
B. If a high priority, apply the patch at the first unscheduled outage.
C. If a low priority, there is no need to apply the patch.
D. If a medium priority, schedule the installation within three months after receipt.

Answer: B

Explanation:
According to the ISA/IEC 62443 Cybersecurity Fundamentals Specialist resources, patches are software updates that fix bugs, vulnerabilities, or improve performance of a system. Patches are classified into three categories based on their urgency and impact: low, medium, and high. Low priority patches are those that have minimal or no impact on the system functionality or security, and can be applied at the next scheduled maintenance. Medium priority patches are those that have moderate impact on the system functionality or security, and should be applied within a reasonable time frame, such as three months. High priority patches are those that have significant or critical impact on the system functionality or security, and should be applied as soon as possible, preferably at the first unscheduled outage. Applying patches in a timely manner is a best practice for maintaining the security and reliability of an industrial automation and control system (IACS).
References:
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section 4.3.2, Patch Management
* ISA/IEC 62443-2-1:2009, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program, Clause 5.3.2.2, Patch management
* ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels, Clause 4.3.3.6.2, Patch management

NEW QUESTION # 28
......

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