Free ISA ISA-IEC-62443 Exam 2026 Practice Materials Collection
ISA-IEC-62443 Exam Info and Free Practice Test All-in-One Exam Guide Mar-2026
NEW QUESTION # 15
If an asset owner wants to demonstrate compliance with ISA/IEC 62443-2-1 requirements during an external audit, which type of evidence would be MOST appropriate?
- A. Anecdotal reports from employees about security practices
- B. Marketing materials describing the company's commitment to security
- C. Financial investment records in cybersecurity tools only
- D. Documentation verifying use and configuration of technologies
Answer: D
Explanation:
To demonstrate compliance with ISA/IEC 62443-2-1, the most effective evidence is formal documentation that shows the actual use, configuration, and operation of required cybersecurity policies and controls.
"The asset owner shall document procedures, configuration settings, and evidence of operational security controls to support compliance assessments and audits."
- ISA/IEC 62443-2-1:2010, Clause 4.3.1 - Documented Security Program
Auditors require verifiable, written proof - not informal reports or promotional material.
References:
ISA/IEC 62443-2-1:2010 - Clause 4.3.1
ISA/IEC 62443-2-4 - Supporting audit evidence for service providers
NEW QUESTION # 16
What impact do increasing cybercrime attacks have?
- A. They affect suppliers of essential services.
- B. They primarily target personal devices.
- C. They lead to improved cybersecurity measures.
- D. They focus solely on financial institutions.
Answer: A
Explanation:
Increasing cybercrime attacks have a significant impact on suppliers of essential services, including those in energy, water, transportation, and manufacturing. ISA/IEC 62443 and related critical infrastructure guidance highlight that attackers are increasingly targeting organizations whose disruption can have widespread societal consequences. While cybercrime can drive organizations to improve cybersecurity, the main documented impact is the risk to essential services and infrastructure.
Reference: ISA/IEC 62443-1-1:2007, Section 4.4; NIST CSF, Section 1.0.
NEW QUESTION # 17
What is the FIRST step required in implementing ISO 27001?
Available Choices (select all choices that are correct)
- A. Implement strict security controls.
- B. Perform a security risk assessment.
- C. Define an information security policy.
- D. Create a security management organization.
Answer: D
NEW QUESTION # 18
Which of the following is a trend that has caused a significant percentage of security vulnerabilities?
Available Choices (select all choices that are correct)
- A. IACS evolving into a number of closed proprietary systems
- B. IACS developing into a network of air-gapped systems
- C. IACS becoming integrated with business and enterprise systems
- D. IACS using equipment designed for measurement and control
Answer: C
Explanation:
One of the trends that has increased the security risks for industrial automation and control systems (IACS) is the integration of these systems with business and enterprise systems, such asenterprise resource planning (ERP), manufacturing execution systems (MES), and supervisory control and data acquisition (SCADA). This integration exposes the IACS to the same threats and vulnerabilities that affect the business and enterprise systems, such as malware, denial-of-service attacks, unauthorized access, and data theft. Moreover, the integration also creates new attack vectors and pathways for adversaries to compromise the IACS, such as through remote access, wireless networks, or third-party devices. Therefore, the integration of IACS with business and enterprise systems is a trend that has caused a significant percentage of security vulnerabilities. References: ISA/IEC 62443 Standards to Secure Your Industrial Control System, page 1-2.
NEW QUESTION # 19
Who is responsible for defining the tolerable residual cybersecurity risk as an input requirement for all activities?
- A. Integration service provider
- B. Asset owner
- C. Product supplier
- D. Maintenance service provider
Answer: B
Explanation:
According to the ISA/IEC 62443 series, it is the asset owner's responsibility to determine what level of residual cybersecurity risk is acceptable after mitigation strategies are applied. This value becomes a key input in defining security levels and selecting controls.
"The asset owner is responsible for defining the tolerable residual risk and establishing acceptable security levels based on business impact and risk tolerance."
- ISA/IEC 62443-3-2:2020, Clause 6.4.2 - Risk Evaluation Inputs
This forms the foundation for SL-T (Target Security Level) determination.
References:
ISA/IEC 62443-3-2:2020 - Clause 6.4.2
ISA/IEC 62443-2-1:2010 - Asset owner roles and responsibilities
NEW QUESTION # 20
Which is a PRIMARY reason why network security is important in IACS environments?
Available Choices (select all choices that are correct)
- A. PLCs under cyber attack can have costly and dangerous impacts.
- B. PLCs are inherently unreliable.
- C. PLCs are programmed using ladder logic.
- D. PLCs use serial or Ethernet communications methods.
Answer: A
NEW QUESTION # 21
What is defined as the hardware and software components of an IACS?
Available Choices (select all choices that are correct)
- A. Cybersecuritv
- B. COTS software and hardware
- C. Control system
- D. Electronic security
Answer: C
NEW QUESTION # 22
Which is a PRIMARY reason why network security is important in IACS environments?
Available Choices (select all choices that are correct)
- A. PLCs under cyber attack can have costly and dangerous impacts.
- B. PLCs are inherently unreliable.
- C. PLCs are programmed using ladder logic.
- D. PLCs use serial or Ethernet communications methods.
Answer: A
Explanation:
Network security is important in IACS environments because PLCs, or programmable logic controllers, are devices that control physical processes and equipment in industrial settings. PLCs under cyber attack can have costly and dangerous impacts, such as disrupting production, damaging equipment, compromising safety, and harming the environment. Therefore, network security is essential to protect PLCs and other IACS components from unauthorized access, modification, or disruption. The other choices are not primary reasons why network security is important in IACS environments. PLCs are not inherently unreliable, but they can be affected by environmental factors, such as temperature, humidity, and electromagnetic interference. PLCs are programmed using ladder logic, which is a graphical programming language that resembles electrical schematics. PLCs use serial or Ethernet communications methods, depending on the type and age of the device, to communicate with other IACS components, such as human-machine interfaces (HMIs), supervisory control and data acquisition (SCADA) systems, and distributed control systems (DCSs). References:
ISA/IEC 62443 Standards to Secure Your Industrial Control System training course1 ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide2 Using the ISA/IEC 62443 Standard to Secure Your Control Systems3
NEW QUESTION # 23
If a system integrator is designing zones and conduits for an IACS network based on risk assessments, which part of the ISA/IEC 62443 standard guides this process?
- A. Part 4-1: Secure product development lifecycle requirements
- B. Part 1-3: System security conformance metrics
- C. Part 3-2: Security risk assessment for system design
- D. Part 2-1: Establishing an IACS security program
Answer: C
Explanation:
ISA/IEC 62443-3-2 specifically provides methodology and guidance for performing risk assessments and defining zones and conduits based on those assessments.
"This standard describes a process for conducting a cybersecurity risk assessment and defines the concept of zones and conduits for segmenting IACS. It provides guidance for assigning security levels and designing mitigation strategies accordingly."
- ISA/IEC 62443-3-2:2020, Clause 5.3 - Zones and Conduits
It is the key reference for system integrators during design and architecture phases of IACS security.
References:
ISA/IEC 62443-3-2:2020 - Clauses 5.2 and 5.3
ISA/IEC 62443-1-1 - Introduction to zones, conduits, and SL-T
NEW QUESTION # 24
After receiving an approved patch from the JACS vendor, what is BEST practice for the asset owner to follow?
- A. If a high priority, apply the patch at the first unscheduled outage.
- B. If a low priority, there is no need to apply the patch.
- C. If a medium priority, schedule the installation within three months after receipt.
- D. If no problems are experienced with the current IACS, it is not necessary to apply the patch.
Answer: A
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 # 25
Which is a physical layer standard for serial communications between two or more devices?
Available Choices (select all choices that are correct)
- A. RS435
- B. RS432
- C. RS232
- D. RS235
Answer: A
NEW QUESTION # 26
Which of the following refers to internal rules that govern how an organization protects critical system resources?
Available Choices (select all choices that are correct)
- A. Formal guidance
- B. Legislation
- C. Security policy
D- Code of conduct
Answer: C
Explanation:
A security policy refers to internal rules that govern how an organization protects critical system resources, such as industrial control systems (ICS). A security policy defines the objectives, scope, roles, responsibilities, and requirements for securing the ICS environment, as well as the procedures and guidelines for implementing, monitoring, and enforcing the security measures. A security policy also establishes the baseline for assessing and managing the security risks to the ICS, and for ensuring compliance with relevant standards, regulations, and best practices. A security policy is a key component of the ICS security program, and it should be documented, communicated, and reviewed regularly.
The other choices are not correct because:
* A. Formal guidance. Formal guidance refers to external sources of information and recommendations that can help an organization improve its ICS security posture, such as standards, frameworks, guidelines, and best practices. Formal guidance is not an internal rule, but rather a reference that can be used to develop, implement, and evaluate the security policy and controls. For example, the ISA/IEC
62443 series of standards provide formal guidance on how to secure ICS from cyber threats1.
* B. Legislation. Legislation refers to external laws and regulations that impose legal obligations and penalties on an organization for its ICS security performance, such as the NERC CIP standards for the electric sector2, or the EU NIS Directive for critical infrastructure operators3. Legislation is not an internal rule, but rather a compliance requirement that must be met by the organization. Legislation may also influence the security policy and controls, as the organization needs to align its security objectives and practices with the legal expectations and consequences.
* D. Code of conduct. A code of conduct refers to a set of ethical principles and values that guide the
* behavior and decision-making of an organization and its employees, such as honesty, integrity, respect, and accountability. A code of conduct is not an internal rule for protecting critical system resources, but rather a general norm for conducting business and maintaining a positive reputation. A code of conduct may also support the security policy and culture, as it can foster a sense of responsibility and trust among the ICS stakeholders.
References:
* 1: ISA/IEC 62443 Standards to Secure Your Industrial Control System
* 2: NERC Critical Infrastructure Protection Standards
* 3: EU Network and Information Systems Directive
NEW QUESTION # 27
How many element groups are in the "Addressing Risk" CSMS category?
Available Choices (select all choices that are correct)
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
The "Addressing Risk" CSMS category consists of three element groups: Security Policy, Organization and Awareness; Selected Security Countermeasures; and Implementation of Security Program1. These element groups cover the aspects of defining the security objectives, roles and responsibilities, policies and procedures, awareness and training, security countermeasures selection and implementation, and security program execution and maintenance1. The "Addressing Risk" CSMS category aims to reduce the security risk to an acceptable level by applying appropriate security measures to the system under consideration (SuC)
1. References: 1: ISA/IEC 62443-2-1: Security for industrial automation and control systems: Establishing an industrial automation and control systems security program
NEW QUESTION # 28
What is TRUE regarding safety systems?
- A. Safety systems are an independent protection layer and as such have no cybersecurity vulnerabilities.
- B. By integrating control and safety systems via Modbus TCP, cybersecurity risks are at a tolerable level.
- C. Even the most modern and sophisticated safety systems can be defeated by an attacker.
- D. No dedicated malware has been found targeting safety systems specifically.
Answer: C
Explanation:
Even the most modern and sophisticated safety systems can be defeated by an attacker. This statement is validated by the discovery of malware specifically targeting safety instrumented systems (SIS), such as the
"Triton/Trisis" malware that compromised the SIS of a petrochemical plant. Safety systems, while designed as independent protection layers, are not immune to cybersecurity vulnerabilities and require specific countermeasures. Integration, such as using Modbus TCP, does not inherently reduce risk to a tolerable level without additional controls.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.2; ISA/IEC 62443-1-1:2007, Section 3.2.4; ISA/IEC 62443-
2-1:2009, Section 4.2.3.2; TRITON/TRISIS incident case studies.
NEW QUESTION # 29
Why is OPC Classic considered firewall unfriendly?
- A. It dynamically assigns several ports.
- B. It is an obsolete communication standard.
- C. It allows use of only port 80.
- D. It works with control devices from different manufacturers.
Answer: A
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 # 30
Electronic security, as defined in ANSI/ISA-99.00.01:2007. includes which of the following?
Available Choices (select all choices that are correct)
- A. Personnel, policies, and procedures related to the security of computers, networks. PLCs, and other programmable configurable components of the system
- B. Computers, networks, operating systems, applications, and other programmable configurable components of the system
- C. Security guidelines for the proper configuration of IACS computers and operating systems
- D. Security guidelines for the proper configuration of IACS PLCs and other programmable configurable components of the system
Answer: A,B
Explanation:
In ANSI/ISA-99.00.01:2007, which is part of the ISA/IEC 62443 standards, electronic security encompasses both the technical and human aspects of cybersecurity within industrial automated and control systems (IACS). Option B correctly highlights components such as computers, networks, operating systems, applications, and other programmable configurable components which are intrinsic to the system's electronic security framework. Option C is also correct as it includes the personnel, policies, and procedures which play a crucial role in securing these systems. This emphasizes that security is not only about the technological solutions but also about managing human elements and organizational processes effectively.
ISA/IEC 62443 Cybersecurity Fundamentals References:
* ISA/IEC 62443 standards focus on the holistic nature of security which is clearly supported by including both the technological (Option B) and human elements (Option C) in the definition of electronic security.
NEW QUESTION # 31
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. Operations Department
- B. Safety Department
- C. Legal Department
- D. Management
Answer: D
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 # 32
What are the three main components of the ISASecure Integrated Threat Analysis (ITA) Program?
Available Choices (select all choices that are correct)
- A. Software robustness security testing, functional software assessment assurance, and essential security
functionality assessment - B. Communication speed, disaster recovery, and essential security functionality assessment
- C. Communications robustness testing, functional security assurance, and software robustness
communications - D. Software development security assurance, functional security assessment, and communications
robustness testing
Answer: D
NEW QUESTION # 33
Which is the PRIMARY objective when defining a security zone?
Available Choices (select all choices that are correct)
- A. All assets in the zone must be physically located in the same area.
- B. All assets in the zone must be from the same vendor.
- C. All assets in the zone must share the same security requirements.
- D. All assets in the zone must be at the same level in the Purdue model.
Answer: C
NEW QUESTION # 34
Which is a role of the application layer?
Available Choices (select all choices that are correct)
- A. Provides the mechanism for opening, closing, and managing a session between end-user application
processes - B. Includes user applications specific to network applications such as email, file transfer, and reading data
registers in a PLC - C. Delivers and formats information, possibly with encryption and security
- D. Includes protocols specific to network applications such as email, file transfer, and reading data registers
in a PLC
Answer: B
NEW QUESTION # 35
Which is a commonly used protocol for managing secure data transmission on the Internet?
Available Choices (select all choices that are correct)
- A. Secure Telnet
- B. Microsoft Point-to-Point Encryption
- C. Datagram Transport Layer Security (DTLS)
- D. Secure Sockets Layer
Answer: C,D
Explanation:
Datagram Transport Layer Security (DTLS) and Secure Sockets Layer (SSL) are both commonly used protocols for managing secure data transmission on the Internet. DTLS is a variant of SSL that is designed to work over datagram protocols such as UDP, which are used for real-time applications such as voice and video.
SSL is a protocol that provides encryption, authentication, and integrity for data transmitted over TCP, which is used for reliable and ordered delivery of data. Both DTLS and SSL use certificates and asymmetric cryptography to establish a secure session between the communicating parties, and then use symmetric cryptography to encrypt the data exchanged. DTLS and SSL are widely used in web browsers, email clients, VPNs, and other applications that require secure communication over the Internet. References:
* ISA/IEC 62443 Standards to Secure Your Industrial Control System, Module 3: Introduction to Cryptography, pages 3-5 to 3-7
* Using the ISA/IEC 62443 Standards to Secure Your Control System, Chapter 6: Securing Communications, pages 125-126
NEW QUESTION # 36
Why is patch management more difficult for IACS than for business systems?
Available Choices (select all choices that are correct)
- A. Business systems automatically update.
- B. Patching a live automation system can create safety risks.
- C. Many more approvals are required.
- D. Overtime pay is required for technicians.
Answer: B
NEW QUESTION # 37
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