2026 ISA-IEC-62443 Question Bank: Free PDF Download Recently Updated Questions
ISA-IEC-62443 Certification Exam Dumps with 221 Practice Test Questions
NEW QUESTION # 114
What is the name of the missing layer in the Open Systems Interconnection (OSI) model shown below?
- A. Protocol
- B. Control
- C. Transport
- D. User
Answer: C
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 # 115
Which of the following is NOT listed as a potential consequence of compromising IACS according to the ISA99 Committee scope?
- A. Endangerment of public safety
- B. Economic and operational losses
- C. Increased product sales
- D. Loss of proprietary information
Answer: C
Explanation:
The ISA99 Committee (which develops the ISA/IEC 62443 series) clearly outlines four key consequences of compromising an Industrial Automation and Control System (IACS):
Endangerment of public or employee safety
Loss of public confidence
Violation of regulatory requirements
Loss of proprietary or confidential information
Economic and operational losses
"Increased product sales" is not listed - in fact, a compromise would likely result in the opposite, such as brand damage and loss of customer trust.
"The scope of the ISA99 Committee includes addressing risks such as the endangerment of public safety, loss of information, and economic harm arising from cyber incidents affecting IACS."
- ISA/IEC 62443-1-1:2007, Clause 1 - Scope and Purpose
References:
ISA/IEC 62443-1-1:2007 - Clause 1
ISA99 Committee Charter and Scope
NEW QUESTION # 116
How many element qroups are in the "Addressinq Risk" CSMS cateqorv?
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 # 117
As related to IACS Maintenance Service Providers, when do maintenance activities generally start?
- A. During the design phase
- B. At the beginning of the project
- C. Before the handover of the solution
- D. After the handover of the solution
Answer: D
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 # 118
An industrial control system requires strong protection against intentional violations using sophisticated means and moderate skills. According to the Security Level (SL) definitions, which SL should be targeted?
- A. SL 3
- B. SL 2
- C. SL 1
- D. SL 4
Answer: A
Explanation:
Security Levels (SLs) in the ISA/IEC 62443 framework define the degree of protection against specific threat actors. SL 3 is designed to protect against intentional violations using sophisticated means with moderate skills, moderate motivation, and IACS-specific knowledge.
"SL 3: Protection against intentional violation using sophisticated means with moderate skills, moderate motivation, and IACS-specific knowledge."
- ISA/IEC 62443-3-3:2013, Table 3 - Target Security Level definitions
This level is commonly applied to systems facing well-resourced threat actors such as organized cybercriminals or advanced persistent threats (APTs), where higher assurance is necessary than what SL1 or SL2 would provide.
References:
ISA/IEC 62443-3-3:2013 - Table 3
ISA/IEC 62443-1-1 - Security Level Definitions
ISA/IEC 62443-3-2 - Security level selection and justification guidance
NEW QUESTION # 119
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 27019
- B. NIST SP 800-53
- C. ISO/IEC 27001
- D. IEC PAS
Answer: A
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 # 120
Which of the following is NOT a strategy for deploying a WAN?
- A. Internet
- B. Enterprise WANs
- C. Carrier-managed WANs
- D. Local area networks
Answer: D
Explanation:
A Local Area Network (LAN) is not a strategy for deploying a Wide Area Network (WAN). WAN deployment strategies include using the public Internet, private enterprise WANs, or carrier-managed WANs.
LANs, by definition, serve local, not wide-area, connectivity. ISA/IEC 62443 standards refer to different strategies for extending network communications over broader geographic regions, but do not classify LAN as a WAN deployment option.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3.4 ("Communications network technologies"); Glossary definitions for LAN and WAN.
NEW QUESTION # 121
Which type of cryptographic algorithms requires more than one key?
Available Choices (select all choices that are correct)
- A. Symmetric (private) key
- B. Block ciphers
- C. Stream ciphers
- D. Asymmetric (public) key
Answer: D
Explanation:
Asymmetric (public) key algorithms are a type of cryptographic algorithms that require more than one key. Asymmetric key algorithms use a pair of keys, one for encryption and one for decryption, that are mathematically related but not identical1. The encryption key is usually made public, while the decryption key is kept private. This allows anyone to encrypt a message using the public key, but only the intendedrecipient can decrypt it using the private key1. Asymmetric key algorithms are also known as public key algorithms or public key cryptography1. Asymmetric key algorithms are used for various purposes, such as digital signatures, key exchange, and encryption2. Some examples of asymmetric key algorithms are RSA, Diffie-Hellman, ElGamal, and Elliptic Curve Cryptography2.
References: Asymmetric Algorithm or Public Key Cryptography - IBM, Cryptography 101: Key Principles, Major Types, Use Cases & Algorithms | Splunk.
NEW QUESTION # 122
Under User Access Control (SP Element 6), which of the following is included in USER 1 - Identification and Authentication?
- A. Password protection
- B. Backup restoration
- C. Incident handling and response
- D. Mutual authentication
Answer: A
Explanation:
SP Element 6 in ISA/IEC 62443-2-1 addresses User Access Control, ensuring that only authorized users can access IACS resources.
Step 1: Definition of USER 1
USER 1 corresponds to Identification and Authentication Control (IAC), the first foundational requirement. It focuses on verifying the identity of users before granting access.
Step 2: Password protection
Password mechanisms are a fundamental form of user authentication and are explicitly included under identification and authentication requirements.
Step 3: Why other options are incorrect
Mutual authentication applies to system-to-system authentication. Backup restoration and incident handling belong to different SP Elements.
Step 4: Security intent
By enforcing password protection, the asset owner ensures accountability, traceability, and prevention of unauthorized access.
Therefore, the correct answer is Password protection.
NEW QUESTION # 123
Which of the following ISA-99 (IEC 62443) Reference Model levels is named correctly?
Available Choices (select all choices that are correct)
- A. Level 2: Quality Control
- B. Level 1: Supervisory Control
- C. Level 4: Process
- D. Level 3: Operations Management
Answer: D
Explanation:
The ISA-99/IEC 62443 standards for industrial automation and control systems security categorize network and system components into different levels based on their operational context. The correct name from the provided options for one of these levels is Level 3: Operations Management. This level typically encompasses systems that manage production control systems, including batch management, production scheduling, and overall factory operations. The other levels listed, such as Supervisory Control and Process, refer to different aspects of the system but are not named correctly in the options provided. Level 1 is correctly referred to as
"Basic Control," and Level 4 should be "Business Logistics" instead of "Process."
NEW QUESTION # 124
What does ISASecure primarily focus on?
- A. Developing internal testing labs
- B. Certifying IACS products and systems for cybersecurity
- C. Managing asset owner operations and maintenance practices
- D. Offering assessments for integrator site engineering practices
Answer: B
Explanation:
ISASecure is a conformity assessment scheme developed under the ISA Security Compliance Institute (ISCI), an affiliate of ISA. Its primary focus is the certification of IACS (Industrial Automation and Control System) products, systems, and supplier processes for cybersecurity. The program's aim is to facilitate and ensure the cybersecurity of automation and control systems by certifying that products and systems meet the requirements set forth in the ISA/IEC 62443 standards. ISASecure offers certifications such as ISASecure EDSA (Embedded Device Security Assurance), SSA (System Security Assurance), and CSA (Component Security Assurance), all of which are tightly mapped to the 62443 series requirements.
Reference: ISA/IEC 62443-4-2:2019, Section 1; ISASecure Certification Program Description, 2024.
NEW QUESTION # 125
How does ISA-62443-2-1 suggest integrating the IACS Security Program (SP) within an organization?
- A. Outsourcing all security responsibilities to third parties
- B. As a standalone system unrelated to other processes
- C. By embedding it into organizational processes and the ISMS
- D. Only focusing on technical controls without process integration
Answer: C
Explanation:
ISA/IEC 62443-2-1 explicitly requires that the IACS Security Program be integrated into the organization's overall management structure.
Step 1: Integration principle
The standard states that IACS security must align with business processes, governance, and enterprise security management rather than operate in isolation.
Step 2: Alignment with ISMS
Where an Information Security Management System (ISMS) exists, the IACS SP should be embedded within it to ensure consistent risk management, policy enforcement, and continuous improvement.
Step 3: Why other options are incorrect
Standalone security programs create silos. Full outsourcing violates asset owner accountability. Purely technical approaches ignore human and process factors.
Step 4: Operational outcome
Embedding the SP ensures sustainability, consistency, and executive oversight.
Therefore, the correct answer is by embedding it into organizational processes and the ISMS.
NEW QUESTION # 126
An industrial facility wants to ensure that only authorized systems reach its PLCs while minimizing disruption to time-sensitive control processes. Which type of firewall would BEST suit this need?
- A. IACS-specific firewall with deep packet inspection
- B. Unidirectional gateway (data diode)
- C. Basic packet filter firewall without protocol awareness
- D. General-purpose software firewall
Answer: A
Explanation:
For industrial networks, the most effective approach is to use IACS-specific firewalls that perform deep packet inspection (DPI) of industrial protocols (e.g., Modbus, DNP3, OPC UA).
"Industrial-specific firewalls with DPI capabilities can inspect control system protocols and enforce granular access control without disrupting time-sensitive operations."
- ISA/IEC 62443-3-3:2013, SR 5.1 - Zone Boundary Protection
Unlike generic IT firewalls, IACS-specific firewalls:
Understand OT protocols
Enforce real-time constraints
Support deterministic traffic flows
References:
ISA/IEC 62443-3-3:2013 - SR 5.1
ISA/IEC 62443-1-1 - Zone and conduit protection technologies
NEW QUESTION # 127
If a U.S. federal agency must comply with mandatory cybersecurity requirements under law, which document would they be required to follow?
- A. NIST FIPS
- B. EU Cyber Resilience Act
- C. NIST Special Publication 800-171
- D. ISA/IEC 62443
Answer: A
Explanation:
For U.S. federal agencies, compliance with cybersecurity requirements is mandated under the Federal Information Security Modernization Act (FISMA). Under this act, agencies are required by law to adhere to NIST Federal Information Processing Standards (FIPS).
From NIST documentation and FISMA:
"Federal agencies must comply with the standards and guidelines developed by NIST, including FIPS 199 and FIPS 200, to ensure appropriate levels of information security." NIST FIPS documents are mandatory for federal agencies, while NIST Special Publications (e.g., SP 800-
171) are recommended or apply to non-federal entities (like contractors).
Incorrect Options:
B). ISA/IEC 62443 - While globally recognized, ISA/IEC 62443 is not mandated by U.S. federal law.
C). EU Cyber Resilience Act - Applies only to European Union entities.
D). NIST SP 800-171 - Applies to defense contractors, not directly to federal agencies.
References:
FISMA (Federal Information Security Modernization Act)
NIST FIPS 199, FIPS 200
ISA/IEC 62443 Study Guide (Context: Applicability and comparison with NIST standards)
NEW QUESTION # 128
Which is the BEST deployment system for malicious code protection?
Available Choices (select all choices that are correct)
- A. Application whitelistinq (AWL) OD.
- B. Zones and conduits
- C. Network segmentation
- D. IACS protocol converters
Answer: A
Explanation:
Application whitelisting (AWL) is a technique that allows only authorized applications to run on a system, and blocks any unauthorized or malicious code from executing. AWL is one of the most effective methods for preventing malware infections and reducing the attack surface of a system. AWL can be implemented at different levels, such as the operating system, the network, or the application itself. AWL is especially useful for industrial automation and control systems (IACS), which often run on legacy or proprietary platforms that are not compatible with traditional antivirus software or other security solutions. AWL can also help protect IACS from zero-day attacks, which exploit unknown vulnerabilities that have not been patched or detected by security vendors. AWL is recommended by the ISA/IEC 62443 standards as a key component of malicious code protection for IACS. According to the standards, AWL should be applied to all IACS components that support it, and should be configured and maintained according to the security policies and procedures of the organization. AWL should also be complemented by other security measures, such as network segmentation, zones and conduits, and patch management, to provide a defense-in-depth approach to IACS security. References:
ISA/IEC 62443-3-3:2013, System security requirements and security levels, Section 5.2.3.41 ISA/IEC 62443-2-1:2010, Establishing an industrial automation and control systems security program, Section 4.3.3.6.42 ISA/IEC 62443-4-2:2019, Technical security requirements for IACS components, Section 4.2.3.43 ISA/IEC 62443-3-2:2020, Security risk assessment for system design, Section 7.3.3.44 ISA/IEC 62443-4-1:2018, Product development requirements, Section 5.2.3.45
NEW QUESTION # 129
Which of the following is an activity that should trigger a review of the CSMS?
Available Choices (select all choices that are correct)
- A. New technical controls
- B. Organizational restructuring
- C. Security incident exposing previously unknown risk.
- D. Budgeting
Answer: A,B,C
Explanation:
According to the ISA/IEC 62443-2-1 standard, a review of the CSMS should be triggered by any changes that affect the cybersecurity risk of the industrial automation and control system (IACS), such as new technical controls, organizational restructuring, or security incidents1. Budgeting is not a trigger for CSMS review, unless it impacts the cybersecurity risk level or the CSMS itself2. References: 1: ISA/IEC 62443-2-1:2010, Section 4.3.3.3 2: A Practical Approach to Adopting the IEC 62443 Standards, ISAGCA Blog3
NEW QUESTION # 130
Multiuser accounts and shared passwords inherently carry which of the followinq risks?
Available Choices (select all choices that are correct)
- A. Unauthorized access
- B. Buffer overflow
- C. Privilege escalation
- D. Race conditions
Answer: C
NEW QUESTION # 131
Under User Access Control (SP Element 6), which of the following is included in USER 1 - Identification and Authentication?
- A. Password protection
- B. Backup restoration
- C. Incident handling and response
- D. Mutual authentication
Answer: A
Explanation:
SP Element 6 in ISA/IEC 62443-2-1 covers User Access Control. Within this, USER 1 - Identification and Authentication includes controls such as:
Unique user identification
Password and credential management
Authentication mechanisms
"USER 1 defines policies for individual user identification and password protection to enforce accountability and prevent unauthorized access."
- ISA/IEC 62443-2-1:2010, Clause 4.3.4 - SP Element 6
"Password protection" is a core component of this control, while other options (like incident handling or backup) fall under different SP elements.
References:
ISA/IEC 62443-2-1:2010 - SP Element 6, USER 1
ISA/IEC 62443-1-1 - Definitions of authentication and access control
NEW QUESTION # 132
Which term refers to legally enforceable rules created by government bodies or authorized organizations?
- A. Frameworks
- B. Special Publications
- C. Standards
- D. Regulations
Answer: D
Explanation:
ISA/IEC 62443 distinguishes between voluntary standards and legally binding obligations. Understanding this distinction is essential for compliance planning.
Step 1: Definition of regulations
Regulations are rules issued by governments or authorized regulators that carry legal force. Non-compliance can result in penalties, fines, or legal action.
Step 2: Standards vs regulations
ISA/IEC 62443 itself is a voluntary international standard unless incorporated into law or contracts.
Frameworks and special publications provide guidance but lack inherent legal enforceability.
Step 3: ISA/IEC 62443 context
The standard acknowledges that asset owners must comply with applicable regulations first, then apply standards like 62443 to meet cybersecurity objectives.
Step 4: Correct terminology
Only regulations meet the definition of legally enforceable rules.
Therefore, the correct answer is Regulations.
NEW QUESTION # 133
What is one reason why IACS systems are highly vulnerable to attack?
- A. They are isolated from all networks.
- B. They often have unpatched software.
- C. They use the latest software updates regularly.
- D. They do not require patches.
Answer: B
Explanation:
ISA/IEC 62443 highlights that many IACS environments operate with long lifecycles and strict availability requirements, which often results in delayed or infrequent patching.
Step 1: Legacy systems and uptime constraints
IACS components may run for decades without replacement. Applying patches can introduce operational and safety risks, so updates are often postponed.
Step 2: Accumulated vulnerabilities
Unpatched systems accumulate known vulnerabilities that attackers can exploit using publicly available tools.
Step 3: Why other options are incorrect
IACS systems are no longer isolated. They do require patches, and they rarely run the latest updates.
Therefore, unpatched software is a major vulnerability factor.
NEW QUESTION # 134
Which analysis method is MOST frequently used as an input to a security risk assessment?
Available Choices (select all choices that are correct)
- A. System Safety Analysis(SSA)
- B. Failure Mode and Effects Analysis
- C. Process Hazard Analysis (PHA)
- D. Job Safety Analysis
Answer: C
NEW QUESTION # 135
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