Free ISA-IEC-62443 Questions for ISA ISA-IEC-62443 Exam [Jul-2026]
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NEW QUESTION # 72
Which is a role of the application layer?
Available Choices (select all choices that are correct)
- A. Includes user applications specific to network applications such as email, file transfer, and reading data
registers in a PLC - B. Provides the mechanism for opening, closing, and managing a session between end-user application
processes - C. Includes protocols specific to network applications such as email, file transfer, and reading data registers
in a PLC - D. Delivers and formats information, possibly with encryption and security
Answer: A
NEW QUESTION # 73
Which is a PRIMARY reason why network security is important in IACS environments?
Available Choices (select all choices that are correct)
- A. PLCs use serial or Ethernet communications methods.
- B. PLCs under cyber attack can have costly and dangerous impacts.
- C. PLCs are programmed using ladder logic.
- D. PLCs are inherently unreliable.
Answer: B
NEW QUESTION # 74
Which service does an Intrusion Detection System (IDS) provide?
Available Choices (select all choices that are correct)
- A. It is effective against all vulnerabilities in networks and computer systems.
- B. It blocks malicious activity in networks and computer systems.
- C. It is the lock on the door for networks and computer systems.
- D. It detects attempts to break into or misuse a computer system.
Answer: D
Explanation:
An intrusion detection system (IDS) is a network security tool that monitors network traffic and devices for known malicious activity, suspicious activity or security policy violations. The IDS sends alerts to IT and security teams when it detects any security risks and threats. However, an IDS does not block or prevent the malicious activity, it only detects and reports it. Therefore, an IDS is not the lock on the door for networks and computer systems, nor is it effective against all vulnerabilities in networks and computer systems. An IDS can be combined with an intrusion prevention system (IPS) to block the malicious activity in real time.
References:
* What is Intrusion Detection Systems (IDS)? How does it Work? | Fortinet1
* Intrusion Detection System (IDS) - GeeksforGeeks2
* What is an intrusion detection system (IDS)? - IBM3
NEW QUESTION # 75
An energy utility company needs to implement cybersecurity controls specifically tailored for industrial control systems. Which standard from the list would be MOST appropriate for their use?
- A. ISO/IEC 27001
- B. NIST SP 800-53
- C. IEC PAS
- D. ISO/IEC 27019
Answer: D
Explanation:
ISO/IEC 27019 is a sector-specific standard that extends ISO/IEC 27002 controls for use in energy utility control systems, including:
SCADA
Distributed control systems (DCS)
Energy automation systems
"ISO/IEC 27019 provides guidelines based on ISO/IEC 27002 for information security controls applicable to process control systems in the energy utility industry."
- ISO/IEC 27019:2017 - Scope
It is specifically designed for industrial automation within the energy sector, making it the most appropriate choice.
References:
ISO/IEC 27019:2017 - Scope and Introduction
ISO/IEC 27000 series mapping to ICS environments
NEW QUESTION # 76
As related to IACS Maintenance Service Providers, when do maintenance activities generally start?
- A. During the design phase
- B. After the handover of the solution
- C. Before the handover of the solution
- D. At the beginning of the project
Answer: B
Explanation:
Maintenance service activities typically begin after the system is deployed and handed over to the asset owner. This is aligned with the Operation and Maintenance phase of the IACS lifecycle.
"Maintenance service providers typically become responsible for cybersecurity-related activities after the asset owner takes ownership of the system, following handover."
- ISA/IEC 62443-2-4:2015, Clause 4.2.3 - Transition and Handover
Prior to handover, integrators and product suppliers manage the system. Maintenance providers take over only post-commissioning.
References:
ISA/IEC 62443-2-4:2015 - Clause 4.2.3
ISA/IEC 62443-1-1 - IACS lifecycle phases
NEW QUESTION # 77
What are the connections between security zones called?
Available Choices (select all choices that are correct)
- A. Pathways
- B. Firewalls
- C. Conduits
- D. Tunnels
Answer: C
Explanation:
According to the ISA/IEC 62443 standard, the connections between security zones are called conduits. A conduit is defined as a logical or physical grouping of communication channels connecting two or more zones that share common security requirements. A conduit can be used to control and monitor the data flow between zones, and to apply security measures such as encryption, authentication, filtering, or logging. A conduit can also be used to isolate zones from each other in case of a security breach or incident. A conduit can be implemented using various technologies, such as firewalls, routers, switches, cables, or wireless links.
However, these technologies are not synonymous with conduits, as they are only components of a conduit. A firewall, for example, can be used to create multiple conduits between different zones, or to protect a single zone from external threats. Therefore, the other options (firewalls, tunnels, and pathways) are not correct names for the connections between security zones. References:
ISA/IEC 62443-3-2:2016 - Security for industrial automation and control systems - Part 3-2: Security risk assessment and system design1 ISA/IEC 62443-3-3:2013 - Security for industrial automation and control systems - Part 3-3: System security requirements and security levels2 Zones and Conduits | Tofino Industrial Security Solution3 Key Concepts of ISA/IEC 62443: Zones & Security Levels | Dragos4
NEW QUESTION # 78
Which of the following provides the overall conceptual basis in the design of an appropriate security program?
- A. Asset model
- B. Reference architecture
- C. Reference model
- D. Zone model
Answer: C
Explanation:
The reference model provides the overall conceptual basis for designing an appropriate security program. The ISA/IEC 62443-1-1 standard introduces the reference model to explain the structure, concepts, and relationships within an industrial automation and control system (IACS). It establishes the foundation for applying zones and conduits and for understanding security levels and how assets interact. This model is the cornerstone for implementing other architectural and technical security controls.
Reference: ISA/IEC 62443-1-1:2007, Section 4.2, "Reference Model"; also see Figure 1 in 62443-1-1.
NEW QUESTION # 79
How should CSMS organizational responsibilities or training be handled over time?
- A. They should remain constant.
- B. They should be evaluated.
- C. They should be ignored.
- D. They should be expanded indefinitely.
Answer: B
Explanation:
ISA/IEC 62443-2-1 emphasizes the importance of the ongoing evaluation of organizational responsibilities and training as part of continuous improvement within the CSMS. Periodic assessment ensures that personnel remain aware of their roles, are adequately trained, and that the program adapts to changes in the environment, technology, or threat landscape. The standard discourages keeping responsibilities static or expanding without control; instead, it advocates for regular reviews and updates.
Reference: ISA/IEC 62443-2-1:2009, Section 5.4.3 ("Training and awareness") and 6.2.4 ("Periodic review and evaluation").
NEW QUESTION # 80
Which of the following is an industry sector-specific standard?
Available Choices (select all choices that are correct)
- A. ISA-62443 (EC 62443)
- B. API 1164
- C. ISO 27001
- D. NIST SP800-82
Answer: B
Explanation:
API 1164 is an industry sector-specific standard that provides guidance on the cybersecurity of pipeline supervisory control and data acquisition (SCADA) systems. API stands for American Petroleum Institute, which is the largest U.S. trade association for the oil and natural gas industry. API 1164 was first published in
2004 and revised in 2009 and 2021. The latest version of the standard aligns with the ISA/IEC 62443 series of standards and incorporates the concepts of security levels, zones, and conduits. API 1164 covers the security lifecycle of pipeline SCADA systems, from risk assessment and policy development to implementation and maintenance. The standard also defines roles and responsibilities, security requirements, security controls, and security assessment methods for pipeline SCADA systems.
References:
API 1164: Pipeline SCADA Security, Fourth Edition, September 2021
ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section 2.2.2, Industry Sector-Specific Standards ISA/IEC 62443 Cybersecurity Fundamentals Specialist Exam Specification, Section 2.2.2, Industry Sector- Specific Standards
NEW QUESTION # 81
Why is OPC Classic considered firewall unfriendly?
Available Choices (select all choices that are correct)
- A. OPC Classic is an obsolete communication standard.
- B. OPC Classic is allowed to use only port 80.
- C. OPC Classic works with control devices from different manufacturers.
- D. OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535.
Answer: D
NEW QUESTION # 82
What is the name of the missing layer in the Open Systems Interconnection (OSI) model shown below?
- A. Protocol
- B. Transport
- C. Control
- D. User
Answer: B
Explanation:
The Open Systems Interconnection (OSI) model is a framework that describes the functions of a networking system. The OSI model categorizes the computing functions of the different network components, outlining the rules and requirement needed to support the interoperability of the software and hardware that make up the network1.
The OSI model consists of seven abstraction layers arranged in a top-down order: Physical, Data Link, Network, Transport, Session, Presentation, and Application. The Transport layer is the fourth layer in the OSI model, and it is responsible for ensuring reliable and efficient data transfer between the Network layer and the Session layer2. The Transport layer uses protocols such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) to provide end-to-end communication services, such as error detection and correction, flow control, congestion control, and segmentation2.
The image that you sent shows a 3D representation of the OSI model, with the layers stacked on top of each other. The missing layer is the Transport layer, which is represented by a pink box with a white arrow pointing to it. The arrow is labeled "TCP, UDP".
1: What is the OSI Model? 7 Network Layers Explained | Fortinet 2: What is OSI Model | 7 Layers Explained
- GeeksforGeeks
NEW QUESTION # 83
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)
- A. Changes are approved by one party and implemented by another.
- B. Developers write and then test their own code.
- C. Design and implementation are performed by the same team.
- D. Configuration settings are made by one party and self-reviewed using a checklist.
Answer: A
Explanation:
Separation of duties is a security principle that aims to prevent fraud, errors, conflicts of interest, or misuse of resources by dividing critical tasks or functions among different people or teams. It is one of the foundational requirements (FRs) of the ISA/IEC 62443 standards for securing industrial automation and control systems (IACSs). According to the ISA/IEC 62443-2-1 standard, separation of duties includes the following system requirements (SRs):
* SR 2.1: Security management policy
* SR 2.2: Personnel security
* SR 2.3: System development and maintenance
* SR 2.4: Incident response and recovery
* SR 2.5: Compliance and review
Among these SRs, the one that is most related to the example of system development and maintenance is SR
2.3. SR 2.3 requires that the IACS shall provide the capability to ensure that the development and maintenance of the system and its components are performed in a secure manner. This means that the IACS should have a mechanism to control the access and authorization of developers, testers, integrators, and maintainers who work on the system and its components. It also means that the IACS should have a mechanism to verify and validate the quality and security of the system and its components before, during, and after the development and maintenance processes.
Therefore, an example of separation of duties as a part of system development and maintenance is that changes are approved by one party and implemented by another. This ensures that the changes are authorized, documented, and reviewed by someone who is not involved in the implementation. This reduces the risk of introducing errors, vulnerabilities, or malicious code into the system and its components.
References:
* ISA/IEC 62443-2-1:2010, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program1
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Certificate Program2
* ISA/IEC 62443 Cybersecurity Library3
* Using the ISA/IEC 62443 Standards to Secure Your Control Systems4
NEW QUESTION # 84
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)
- A. Changes are approved by one party and implemented by another.
- B. Developers write and then test their own code.
- C. Design and implementation are performed by the same team.
- D. Configuration settings are made by one party and self-reviewed using a checklist.
Answer: A
Explanation:
Separation of duties is a security principle that aims to prevent fraud, errors, conflicts of interest, or misuse of resources by dividing critical tasks or functions among different people or teams. It is one of the foundational requirements (FRs) of the ISA/IEC 62443 standards for securing industrial automation and control systems (IACSs). According to the ISA/IEC 62443-2-1 standard, separation of duties includes the following system requirements (SRs):
* SR 2.1: Security management policy
* SR 2.2: Personnel security
* SR 2.3: System development and maintenance
* SR 2.4: Incident response and recovery
* SR 2.5: Compliance and review
Among these SRs, the one that is most related to the example of system development and maintenance is SR
2.3. SR 2.3 requires that the IACS shall provide the capability to ensure that the development and maintenance of the system and its components are performed in a secure manner. This means that the IACS should have a mechanism to control the access and authorization of developers, testers, integrators, and maintainers who work on the system and its components. It also means that the IACS should have a mechanism to verify and validate the quality and security of the system and its components before, during, and after the development and maintenance processes.
Therefore, an example of separation of duties as a part of system development and maintenance is that changes are approved by one party and implemented by another. This ensures that the changes are authorized, documented, and reviewed by someone who is not involved in the implementation. This reduces the risk of introducing errors, vulnerabilities, or malicious code into the system and its components.
References:
ISA/IEC 62443-2-1:2010, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program1 ISA/IEC 62443 Cybersecurity Fundamentals Specialist Certificate Program2 ISA/IEC 62443 Cybersecurity Library3 Using the ISA/IEC 62443 Standards to Secure Your Control Systems4
NEW QUESTION # 85
What is a major reason for maintaining an asset inventory baseline in Configuration Management (SP Element 2)?
- A. To ensure physical access control
- B. To document IACS architecture
- C. To enforce user authentication policies
- D. To detect security anomalies in event management
Answer: B
Explanation:
SP Element 2 in ISA/IEC 62443-2-1 focuses on Configuration Management, with the asset inventory baseline as a foundational requirement.
Step 1: Purpose of an inventory baseline
The inventory baseline documents all hardware, software, firmware, and configuration items that make up the IACS. This establishes a known, trusted state of the system.
Step 2: Architecture visibility
By maintaining this baseline, the asset owner gains a clear and accurate understanding of the IACS architecture, including system components, versions, and dependencies.
Step 3: Why other options are incorrect
Physical access control and user authentication are addressed in different SP Elements. Event management detects anomalies, but it relies on the inventory baseline rather than replacing it.
Thus, the primary reason is to document IACS architecture.
NEW QUESTION # 86
What does Layer 1 of the ISO/OSI protocol stack provide?
Available Choices (select all choices that are correct)
- A. Data encryption, routing, and end-to-end connectivity
- B. Framing, converting electrical signals to data, and error checking
- C. The electrical and physical specifications of the data connection
- D. User applications specific to network applications such as reading data registers in a PLC
Answer: C
NEW QUESTION # 87
Which layer specifies the rules for Modbus Application Protocol
Available Choices (select all choices that are correct)
- A. Session layer
- B. Presentation layer
- C. Application layer
- D. Data link layer
Answer: C
NEW QUESTION # 88
A manufacturing plant is developing a cybersecurity plan for its IACS that must evolve as new threats emerge and system changes occur. Which document should serve as the foundation for this evolving security approach?
- A. Corporate KPIs unrelated to IACS
- B. Security Protection Scheme (SPS)
- C. IEC 62443-2-2 only
- D. Security Program (SP) portfolio
Answer: D
Explanation:
The Security Program (SP) portfolio, described in IEC 62443-2-1, is the cornerstone for an organization's cybersecurity management for Industrial Automation and Control Systems (IACS). It provides a structured, documented, and dynamic security management approach that evolves as system configurations change and new threats emerge.
IEC 62443-2-1, Clause 4.1.3 states:
"The organization shall develop and maintain a cyber security management system (CSMS) as part of its overall security program. The CSMS provides a systematic approach to defining, implementing, and maintaining policies, procedures, and practices necessary to protect IACS assets." Furthermore, Clause 4.2 emphasizes:
"The security program shall be continually updated based on changes in the threat environment, vulnerabilities, or changes to the organization's IACS assets or systems." The SP portfolio includes the Cybersecurity Management System (CSMS), policies, procedures, roles, responsibilities, and improvement mechanisms. This allows continuous adaptation to evolving cybersecurity requirements.
Incorrect Options:
A). IEC 62443-2-2 only - While it focuses on implementation of security capabilities for asset owners, it does not represent the full foundation for a dynamic and evolving security plan.
C). Corporate KPIs unrelated to IACS - Irrelevant to cybersecurity planning for IACS.
D). Security Protection Scheme (SPS) - Related to zone and conduit security design (IEC 62443-3-2), but not the strategic, evolving program foundation.
References:
ISA/IEC 62443-2-1:2010 - "Security for Industrial Automation and Control Systems - Establishing an IACS Security Program" Official ISA/IEC 62443 Study Guide
NEW QUESTION # 89
What does the abbreviation CSMS round in ISA 62443-2-1 represent?
Available Choices (select all choices that are correct)
- A. Cyber Security Monitoring System
- B. Cyber Security Management System
- C. Control System Monitoring System
- D. Control System Management System
Answer: B
NEW QUESTION # 90
What makes patching in IACS environments particularly complex?
- A. Continuous operations and safety concerns
- B. The availability of unlimited maintenance windows
- C. Patches never require testing before deployment
- D. Cyber threats do not affect IACS systems
Answer: A
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 # 91
Which of the following is a cause for the increase in attacks on IACS?
Available Choices (select all choices that are correct)
- A. The move away from commercial off the shelf (COTS) systems, protocols, and networks
- B. Knowledge of exploits and tools readily available on the Internet
- C. Use of proprietary communications protocols
- D. Fewer personnel with system knowledge having access to IACS
Answer: A
NEW QUESTION # 92
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