[Nov-2026] Check your preparation for ISA ISA-IEC-62443 On-Demand Exam
Practice Exam ISA-IEC-62443 Realistic Dumps Verified Questions
NEW QUESTION # 88
Which is the BEST deployment system for malicious code protection?
Available Choices (select all choices that are correct)
- A. Network segmentation
- B. Application whitelistinq (AWL) OD.
- C. IACS protocol converters
- D. Zones and conduits
Answer: B
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 # 89
What is the primary focus of Part 3-2 in the ISA/IEC 62443 series?
- A. Technical security requirements for IACS components
- B. Cybersecurity risk assessment and system design
- C. Security technologies for IACS
- D. Secure product development lifecycle requirements
Answer: B
Explanation:
ISA/IEC 62443-3-2 is titled "Security risk assessment for system design" and provides a methodology for performing cybersecurity risk assessments and for the design of security zones and conduits within IACS. It describes how to identify assets, assess threats and vulnerabilities, assign Security Levels (SLs), and develop a security design based on risk.
Reference: ISA/IEC 62443-3-2:2020, Scope and Section 4.1 ("Purpose and objectives of 62443-3-2").
NEW QUESTION # 90
Which of the following can be employed as a barrier device in a segmented network?
Available Choices (select all choices that are correct)
- A. VPN
- B. Router
- C. Unmanaged switch
- D. Domain controller
Answer: B
NEW QUESTION # 91
What is one reason why IACS systems are highly vulnerable to attack?
- A. They do not require patches.
- B. They often have unpatched software.
- C. They are isolated from all networks.
- D. They use the latest software updates regularly.
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 # 92
Which of the following is a recommended default rule for IACS firewalls?
Available Choices (select all choices that are correct)
- A. Allow IACS devices to access the Internet.
- B. Block all traffic by default.
- C. Allow traffic directly from the IACS network to the enterprise network.
- D. Allow all traffic by default.
Answer: B
Explanation:
A recommended default rule for IACS firewalls is to block all traffic by default, and then allow only the necessary and authorized traffic based on the security policy and the zone and conduit model. This is also known as the principle of least privilege, which means granting the minimum access required for a legitimate purpose. Blocking all traffic by default provides a higher level of security and reduces the attack surface of the IACS network. The other choices are not recommended default rules for IACS firewalls, as they may expose the IACS network to unnecessary risks. Allowing all traffic by default would defeat the purpose of a firewall, as it would not filter any malicious or unwanted traffic. Allowing IACS devices to access the Internet would expose them to potential cyber threats, such as malware, phishing, or denial-of-service attacks.
Allowing traffic directly from the IACS network to the enterprise network would bypass the demilitarized zone (DMZ), which is a buffer zone that isolates the IACS network from the enterprise network and hosts services that need to communicate between them. 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 # 93
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 using equipment designed for measurement and control
- D. IACS becoming integrated with business and enterprise systems
Answer: D
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 # 94
When selecting a risk assessment methodology for a complex industrial automation system, which approach aligns BEST with ISA/IEC 62443 guidance?
- A. Follow any documented methodology as long as it uses a consistent risk ranking scale.
- B. Use different methodologies for initial and detailed assessments to cover more perspectives.
- C. Only perform qualitative assessments without quantitative measures.
- D. Avoid using standards or frameworks to maintain flexibility.
Answer: A
Explanation:
ISA/IEC 62443-3-2 intentionally avoids mandating a single risk assessment methodology. Instead, it defines requirements for the outcome and consistency of the risk assessment process.
Step 1: Methodology flexibility
The standard allows asset owners to use qualitative, quantitative, or hybrid methods based on system complexity, organizational maturity, and available data.
Step 2: Consistency requirement
What ISA/IEC 62443 does require is that the methodology be documented, repeatable, and consistent, particularly in how risks are ranked and compared.
Step 3: Security Level determination
Consistent risk ranking is essential for determining Target Security Levels (SL-T) and for justifying security decisions during audits.
Step 4: Why other options are incorrect
Avoiding standards undermines rigor. Using only qualitative methods may be insufficient. Mixing methodologies can introduce inconsistency and invalidate comparisons.
Therefore, the approach that best aligns with ISA/IEC 62443 is to follow any documented methodology that uses a consistent risk ranking scale.
NEW QUESTION # 95
What.are the two elements of the risk analysis category of an IACS?
Available Choices (select all choices that are correct)
- A. Business rationale and risk identification and classification
- B. Business rationale and risk reduction and avoidance
- C. Risk evaluation and risk identification
- D. Business recovery and risk elimination or mitigation
Answer: A
NEW QUESTION # 96
What caution is advised when using the vector approach to security levels?
- A. Vector approaches eliminate the need for risk models.
- B. Vector approaches are always more accurate than qualitative methods.
- C. Vector values must align with the asset owner's risk matrix and risk appetite.
- D. Vector values should be ignored if they do not match industry standards.
Answer: C
Explanation:
When using the security level (SL) vector approach in ISA/IEC 62443, each Foundational Requirement (FR) can have its own SL-T value. However, these values must reflect the organization's specific risk assessment outcomes, not generic or industry default values.
"SL vectors should be derived based on the asset owner's own risk matrix and risk tolerance, ensuring that the security levels support operational needs and business requirements."
- ISA/IEC 62443-3-2:2020, Clause 6.5.2 - SL-T Vector Selection
Misalignment could lead to over- or under-protection of critical zones or conduits.
References:
ISA/IEC 62443-3-2:2020 - Clause 6.5.2
ISA/IEC 62443-3-3 - SL Vector and FR Mapping
NEW QUESTION # 97
An industrial facility wants to ensure that only authorized communication reaches its PLCs while minimizing disruption to time-sensitive control processes. Which type of firewall would BEST suit this need?
- A. Unidirectional gateway (data diode)
- B. General-purpose software firewall
- C. IACS-specific firewall with deep packet inspection
- D. Basic packet filter firewall without protocol awareness
Answer: C
Explanation:
ISA/IEC 62443 recommends protocol-aware security controls for IACS networks to protect real-time communications.
Step 1: ICS protocol awareness
IACS-specific firewalls understand industrial protocols such as Modbus, DNP3, and IEC 61850, allowing precise control without breaking deterministic behavior.
Step 2: Deep packet inspection (DPI)
DPI enables inspection of commands and function codes, blocking unauthorized actions while allowing legitimate traffic.
Step 3: Why other options are unsuitable
General-purpose firewalls lack protocol awareness. Data diodes restrict bidirectional control. Basic packet filters cannot inspect commands.
Therefore, the correct choice is IACS-specific firewall with deep packet inspection.
NEW QUESTION # 98
Multiuser accounts and shared passwords inherently carry which of the followinq risks?
Available Choices (select all choices that are correct)
- A. Buffer overflow
- B. Race conditions
- C. Unauthorized access
- D. Privilege escalation
Answer: C,D
Explanation:
Multiuser accounts and shared passwords are accounts and passwords that are used by more than one person to access a system or a resource. They inherently carry the risk of unauthorized access, which means that someone who is not authorized or intended to use the account or password can gain access to the system or resource, and potentially compromise its confidentiality, integrity, or availability. For example, if a multiuser account and password are shared among several operators of an industrial automation and control system (IACS), an attacker who obtains the password can use the account to access the IACS and perform malicious actions, such as changing the system settings, deleting data, or disrupting the process. Multiuser accounts and shared passwords also make it difficult to track and audit the activities of individual users, and to enforce the principle of least privilege, which states that users should only have the minimum level of access required to perform their tasks. Therefore, the ISA/IEC 62443 standards recommend avoiding the use of multiuser accounts and shared passwords, and instead using individual accounts and strong passwords for each user, and implementing authentication and authorization mechanisms to control the access to the IACS. References:
* ISA/IEC 62443-3-3:2013 - Security for industrial automation and control systems - Part 3-3: System security requirements and security levels1
* ISA/IEC 62443-2-1:2009 - Security for industrial automation and control systems - Part 2-1:
Establishing an industrial automation and control systems security program2
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Training Course3
Shared passwords and multiuser accounts pose specific risks, notably unauthorized access and privilege escalation. In ISA/IEC 62443's framework, these practices are discouraged because they complicate the attribution of actions to individual users and increase the likelihood that accounts can be used beyond their intended scope. Unauthorized access occurs when individuals exploit the shared nature of an account to gain entry to systems or data that they should not access. Privilege escalation can happen when users leverage shared accounts to perform actions at higher permission levels than those assigned to their personal accounts.
Conversely, buffer overflows and race conditions are types of vulnerabilities or programming errors, not directly associated with the risks of multiuser accounts or shared passwords.
NEW QUESTION # 99
Which is the PRIMARY responsibility of the network layer of the Open Systems Interconnection (OSI)
model?
Available Choices (select all choices that are correct)
- A. Provides the rules for framing, converting electrical signals to data
- B. Forwards packets, including routing through intermediate routers
- C. Handles the physics of getting a message from one device to another
- D. Gives transparent transfer of data between end users
Answer: B
NEW QUESTION # 100
What programs are MOST effective if they are tailored to the audience, consistent with company policy, and communicated regularly?
- A. ISCS cybersecurity certification programs
- B. CSMS development programs
- C. Control systems adjustment programs
- D. Cybersecurity awareness programs
Answer: D
Explanation:
Cybersecurity awareness programs are most effective when tailored to the organization's audience, are aligned with corporate policies, and are communicated regularly. ISA/IEC 62443-2-1 emphasizes the importance of ongoing cybersecurity training and awareness, customized to different user roles, as a critical factor in reducing human-related security risks.
Reference: ISA/IEC 62443-2-1:2009, Section 6.2.4 ("Training and awareness").
NEW QUESTION # 101
A company needs to create a standardized interface for exchanging real-time plant data between heterogeneous control devices while maintaining a structured organization of data elements such as folders, classes, and methods. Which feature of OPC supports this requirement?
- A. OPC Tunnel Applications for firewalls
- B. OPC Unified Architecture's browsable namespace
- C. OPC Classic aware firewalls analyzing DCOM
- D. OPC Classic's use of Microsoft OLE and COM technologies
Answer: B
Explanation:
OPC Unified Architecture (OPC UA) introduces a browsable namespace that supports hierarchical organization of data including folders, classes, methods, and object types. This is critical for structured access to real-time and historical data across heterogeneous control systems.
"OPC UA provides a flexible, secure, and platform-independent mechanism for exchanging information. Its browsable namespace allows structured navigation of nodes, types, and attributes in a hierarchical format."
- OPC UA Specification, Part 3 - Address Space Model
This is a key improvement over OPC Classic, which was tightly coupled to DCOM and lacked standardized structures across systems.
References:
OPC UA Specification - Part 3: Address Space Model
ISA/IEC 62443-3-3 - SR 3.1 RE: Secure data exchange mechanisms
NEW QUESTION # 102
Which is one of the PRIMARY goals of providing a framework addressing secure product development life-cycle requirements?
Available Choices (select all choices that are correct)
- A. Aligned needs of industrial users
- B. Defense-in-depth approach to designing
- C. Aligned development process
- D. Well-documented security policies and procedures
Answer: D
Explanation:
One of the primary goals of providing a framework that addresses secure product development lifecycle requirements is to ensure that security policies and procedures are well-documented. This objective is crucial because it establishes a structured and standardized approach to security that is integrated throughout the development process of software or systems. This framework helps in aligning the development process with security best practices, thereby mitigating risks associated with security vulnerabilities. Documentation of security policies and procedures ensures that security considerations are consistently applied and that compliance with relevant standards, such as ISA/IEC 62443, is maintained. This foundational approach supports the overall security posture by embedding security considerations directly into the lifecycle of product development, rather than addressing security as an afterthought.
NEW QUESTION # 103
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. Communications robustness testing, functional security assurance, and software robustness
communications - D. Communication speed, disaster recovery, and essential security functionality assessment
Answer: A
NEW QUESTION # 104
Which statement BEST describes the Target Security Protection Ratings?
- A. They define the levels of security requirements fulfilled through implementation measures.
- B. They represent the actual security levels achieved at a time during operation.
- C. They measure the cost-effectiveness of security investments or implementation measures.
- D. They outline the desired levels of system security requirements to be fulfilled during operation.
Answer: D
Explanation:
Target Security Levels (SL-T) or Target Security Protection Ratings are defined as the desired security levels that must be achieved for a specific zone or conduit, based on risk assessment and business requirements.
"The Target Security Level (SL-T) represents the desired level of protection against threats for a zone or conduit, to be fulfilled through appropriate security measures."
- ISA/IEC 62443-3-2:2020, Clause 6.5.2 - Target SL Vector Determination They are not the actual achieved level (SL-A), nor are they a measure of cost-effectiveness. SL-Ts guide system designers and implementers in selecting appropriate security controls.
References:
ISA/IEC 62443-3-2:2020 - Clause 6.5.2
ISA/IEC 62443-1-1 - Security Level Types: SL-T, SL-A, SL-C
NEW QUESTION # 105
Which statement BEST describes the Target Security Protection Ratings?
- A. They define the levels of security requirements fulfilled through implementation measures.
- B. They represent the actual security levels achieved at a time during operation.
- C. They measure the cost-effectiveness of security investments or implementation measures.
- D. They outline the desired levels of system security requirements to be fulfilled during operation.
Answer: D
Explanation:
In ISA/IEC 62443, Target Security Protection Ratings correspond to the concept of Target Security Levels (SL-T).
Step 1: Definition of target ratings
Target ratings describe the desired level of protection that a system or zone must achieve during operation, based on risk assessment.
Step 2: Difference between target and achieved
* Target ratings define what is required.
* Achieved ratings (SL-A) describe what has actually been implemented and verified.
Step 3: Why Option D is correct
The target rating outlines the intended security outcome that implementation measures must fulfill during operation, not what currently exists.
Step 4: Why other options are incorrect
Actual achieved levels, cost metrics, or implementation measurements are separate concepts.
Therefore, the correct description is that they outline the desired levels of system security requirements to be fulfilled during operation.
NEW QUESTION # 106
If a U.S. federal agency must comply with mandatory cybersecurity requirements under law, which document would they be required to follow?
- A. NIST Special Publication 800-171
- B. EU Cyber Resilience Act
- C. NIST FIPS
- D. ISA/IEC 62443
Answer: C
Explanation:
For U.S. federal agencies, mandatory cybersecurity requirements under law are established through Federal Information Processing Standards (FIPS). FIPS are issued by the U.S. government and are legally enforceable for federal agencies and contractors when specified by statute or regulation. This legal enforceability distinguishes FIPS from voluntary standards and frameworks.
Step 1: Understand the legal nature of FIPS
FIPS are developed under U.S. law to define minimum security requirements for federal information systems.
When a federal agency operates or procures information systems, compliance with applicable FIPS is mandatory. This makes FIPS a legal obligation rather than a best-practice recommendation.
Step 2: Differentiate standards vs regulations
ISA/IEC 62443 is an international consensus-based standard intended primarily for industrial automation and control systems. While widely adopted and referenced by regulators, it is not legally mandatory unless explicitly incorporated into law or contracts. Therefore, it does not satisfy the requirement "under law" by itself.
Step 3: Eliminate incorrect options
* The EU Cyber Resilience Act applies to products placed on the European Union market and has no jurisdiction over U.S. federal agencies.
* NIST SP 800-171 provides requirements for protecting Controlled Unclassified Information (CUI) in non-federal systems, but it becomes mandatory only through contractual flow-downs, not directly as federal law.
Step 4: Align with ISA/IEC 62443 perspective
ISA/IEC 62443 acknowledges that regulatory and legal obligations override voluntary standards. Asset owners must comply with applicable laws first, then apply ISA/IEC 62443 controls to meet industrial cybersecurity objectives.
Thus, for a U.S. federal agency facing mandatory cybersecurity requirements under law, NIST FIPS is the correct answer.
NEW QUESTION # 107
What is the primary purpose of the NIST Cybersecurity Framework (CSF)?
- A. To replace existing cybersecurity standards
- B. To create new cybersecurity technologies
- C. To provide a certification program for organizations
- D. To enhance the resilience of critical infrastructure
Answer: D
Explanation:
The NIST Cybersecurity Framework (CSF) was developed to enhance the security and resilience of critical infrastructure in the United States by providing a flexible, repeatable, and cost-effective risk-based approach to managing cybersecurity risk. It is designed to complement, not replace, existing standards and guidelines, and is intended for voluntary adoption by critical infrastructure organizations.
Reference: ISA/IEC 62443-1-1:2007, Section 4.2.7; NIST CSF Framework Core, "Purpose and Scope" (NIST CSF 1.1, Section 1.0).
NEW QUESTION # 108
At Layer 4 of the Open Systems Interconnection (OSI) model, what identifies the application that will handle a packet inside a host?
Available Choices (select all choices that are correct)
- A. ATCP/UDP port number
- B. A TCP/UDP host ID
- C. ATCP/UDP application ID
- D. ATCP/UDP registry number
Answer: A
Explanation:
At layer 4 of the OSI model, also known as the transport layer, the application that will handle a packet inside a host is identified by a TCP/UDP port number. A port number is a 16-bit integer that is assigned to a specific application or service that runs on a host. Port numbers are used to multiplex and demultiplex the data streams that are exchanged between hosts and end systems. Multiplexing is the process of combining multiple data streams into one, while demultiplexing is the process of separating one data stream into multiple ones. Port numbers are part of the header of the transport layer protocol data unit (PDU), which is called a segment for TCP and a datagram for UDP. The header contains the source port number and the destination port number, which indicate the applications that are involved in the communication. For example, if a host sends a packet to another host using the HTTP protocol, which runs on port 80 by default, the source port number would be a random number chosen by the sender, and the destination port number would be 80. The receiver would then use the destination port number to demultiplex the packet and deliver it to the HTTP application.
Port numbers are divided into three ranges: well-known ports (0-1023), registered ports (1024-49151), and dynamic or private ports (49152-65535). Well-known ports are reserved for common and standardized applications and services, such as HTTP (80), FTP (21), and SSH (22). Registered ports are assigned by the Internet Assigned Numbers Authority (IANA) to specific applications and services that request them, such as Skype (49175) and Minecraft (25565). Dynamic or private ports are not assigned by any authority and can be used by any application or service that needs them, such as ephemeral ports that are used for temporary connections.
The other options are not valid identifiers for the application that will handle a packet inside a host at layer 4 of the OSI model. A TCP/UDP application ID is not a term that is used in the OSI model or the TCP/IP model. A TCP/UDP host ID is not a term that is used in the OSI model or the TCP/IP model, and it would be more appropriate for layer 3, which is the network layer, where the host is identified by an IP address. A TCP
/UDP registry number is not a term that is used in the OSI model or the TCP/IP model, and it would be more appropriate for layer 5, which is the session layer, where the registry number is used to identify a session between two hosts.
References:
Transport Layer | Layer 4 | The OSI-Model1
OSI model - Wikipedia2
What is Layer 4 of the OSI Model? | Glossary | A10 Networks3
What Are the 7 Layers of the OSI Model? | Webopedia4
NEW QUESTION # 109
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. Security Program (SP) portfolio
- B. IEC 62443-2-2 only
- C. Corporate KPIs unrelated to IACS
- D. Security Protection Scheme (SPS)
Answer: A
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 # 110
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