[Apr 12, 2026] Free ISA Cybersecurity ISA-IEC-62443 Exam Question
ISA-IEC-62443 dumps & ISA Cybersecurity sure practice dumps
NEW QUESTION # 22
If a U.S. federal agency must comply with mandatory cybersecurity requirements under law, which document would they be required to follow?
- A. ISA/IEC 62443
- B. EU Cyber Resilience Act
- C. NIST FIPS
- D. NIST Special Publication 800-171
Answer: C
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 # 23
What is a commonly used protocol for managing secure data transmission over a Virtual Private Network (VPN)?
Available Choices (select all choices that are correct)
- A. SSH
- B. HTTPS
- C. MPLS
- D. IPSec
Answer: D
Explanation:
IPSec is a commonly used protocol for managing secure data transmission over a VPN. IPSec stands for Internet Protocol Security and it is a set of standards that define how to encrypt and authenticate data packets that travel between two or more devices over an IP network. IPSec can operate in two modes: transport mode and tunnel mode. In transport mode, IPSec only encrypts the payload of the IP packet, leaving the header intact. In tunnel mode, IPSec encrypts the entire IP packet and encapsulates it in a new IP header. Tunnel mode is more secure and more suitable for VPNs, as it can protect the original source and destination addresses of the IP packet from eavesdropping or spoofing. IPSec uses two main protocols to provide security services: Authentication Header (AH) and Encapsulating Security Payload (ESP). AH provides data integrity and source authentication, but not confidentiality. ESP provides data integrity, source authentication, and confidentiality. IPSec also uses two protocols to establish and manage security associations (SAs), which are the parameters and keys used for encryption and authentication: Internet Key Exchange (IKE) and Internet Security Association and Key Management Protocol (ISAKMP). IKE is a protocol that negotiates and exchanges cryptographic keys between two devices. ISAKMP is a protocol that defines the format and structure of the messages used for key exchange and SA management.
References:
ISA/IEC 62443-3-3:2018, Section 4.2.3.7.1, VPN1
ISA/IEC 62443-4-2:2019, Section 4.2.3.7.1, VPN
ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section 5.3.2, VPN ISA/IEC 62443 Cybersecurity Fundamentals Specialist Exam Specification, Section 5.3.2, VPN
NEW QUESTION # 24
What is Modbus?
- A. A serial communications protocol
- B. A network security standard
- C. A programming language
- D. A type of industrial machinery
Answer: A
Explanation:
Modbus is defined as a serial communication protocol widely used in industrial environments to enable communication among devices such as PLCs, sensors, and actuators.
From ISA/IEC 62443-1-1 (Terminology, Concepts, and Models), Modbus is mentioned in the context of communication protocols:
"Many IACS use legacy communication protocols (e.g., Modbus, DNP3) that were not originally designed with cybersecurity in mind." Modbus was developed in 1979 by Modicon and operates over serial lines (RS-232, RS-485) or over Ethernet as Modbus TCP/IP. It follows a master/slave or client/server architecture.
Incorrect Options:
A). A programming language - Modbus is not a language; it's a protocol.
B). A network security standard - It lacks built-in security; it is a communication protocol, not a security standard.
C). A type of industrial machinery - It facilitates communication between machinery, but is not machinery itself.
References:
ISA/IEC 62443-1-1:2007 - "Terminology, Concepts, and Models"
Official ISA/IEC 62443 Study Guide
NEW QUESTION # 25
Which steps are part of implementing countermeasures?
Available Choices (select all choices that are correct)
- A. Establish the risk tolerance and select common countermeasures.
- B. Establish the risk tolerance and update the business continuity plan.
- C. Select common countermeasures and update the business continuity plan.
- D. Select common countermeasures and collaborate with stakeholders.
Answer: A
Explanation:
According to the ISA/IEC 62443-3-2 standard, implementing countermeasures is one of the steps in the security risk assessment for system design. The standard defines a comprehensive set of engineering measures to guide organizations through the process of assessing the risk of a particular industrial automation and control system (IACS) and identifying and applying security countermeasures to reduce that risk to tolerable levels. The standard recommends the following steps for implementing countermeasures:
Establish the risk tolerance: This step involves determining the acceptable level of risk for the organization and the system under consideration, based on the business objectives, legal and regulatory requirements, and stakeholder expectations. The risk tolerance can be expressed as a target security level (SL-T) for each zone or conduit in the system.
Select common countermeasures: This step involves selecting the appropriate security countermeasures for each zone or conduit, based on the SL-T and the existing security level (SL-A) of the system. The standard provides a list of common countermeasures for each security level, covering the domains of physical security, network security, system security, and application security. The selected countermeasures should be documented and justified in the security risk assessment report. References: ISA/IEC 62443 Cybersecurity Series Designated as IEC Horizontal Standards, Cybersecurity Risk Assessment According to ISA/IEC 62443-
3-2
NEW QUESTION # 26
Which of the following BEST describes a control system?
- A. Actions to prevent loss of revenue
- B. Unauthorized modifications to data
- C. Measures taken to protect against unauthorized access
- D. Hardware and software components of an IACS
Answer: D
Explanation:
A control system, in the context of ISA/IEC 62443, refers to the hardware and software components of an Industrial Automation and Control System (IACS). This includes PLCs, SCADA, DCS, HMIs, sensors, actuators, and supporting networks and applications used to monitor and control physical processes.
Reference: ISA/IEC 62443-1-1:2007, Section 3.2.1 (Definition of control system and IACS).
NEW QUESTION # 27
What does Part 6-1 of the ISA/IEC 62443 series specify?
- A. Security technologies for ICS and IACS
- B. Patch management guidance
- C. System security requirements, phases, and levels
- D. Security evaluation methodology for Part 2-4
Answer: D
Explanation:
ISA/IEC 62443-6-1 defines a security evaluation methodology specifically intended for use with 62443-2-4 (Service Providers) and 62443-4-1 (Secure Development Lifecycle). It provides assessment techniques and scoring models for verifying conformance.
"This part specifies requirements and provides guidance for the assessment of conformity to selected parts of the ISA/IEC 62443 series. It supports evaluation of suppliers per 62443-2-4 and 62443-4-1."
- ISA/IEC 62443-6-1:2020, Clause 1 - Scope
It is not focused on patching, technologies, or security phases, but rather on evaluating and validating conformance to the standards.
References:
ISA/IEC 62443-6-1:2020 - Clauses 1 and 4
ISA/IEC 62443-2-4 and 4-1 - Reference to evaluation applicability
NEW QUESTION # 28
Which is a common pitfall when initiating a CSMS program?
Available Choices (select all choices that are correct)
- A. Insufficient documentation due to lack of good follow-up
- B. Organizational lack of communication
- C. Failure to relate to the mission of the organization
- D. Immediate jump into detailed risk assessment
Answer: D
Explanation:
"A common pitfall is to attempt to initiate a CSMS program without at least a high-level rationale that relates cyber security to the specific organization and its mission." A CSMS program is a Cybersecurity Management System program that follows the IEC 62443 standards for securing industrial control systems (ICS)1. A common pitfall when initiating a CSMS program is D.
Immediate jump into detailed risk assessment. This is because a detailed risk assessment requires a clear definition of the system under consideration (SuC), the allocation of IACS assets to zones and conduits, and the identification of threats, vulnerabilities, and consequences for each zone and conduit2. These steps are part of the assess phase of the CSMS program, which is the first phase of the security program development process2. However, before starting the assess phase, it is important to have the management team's support to ensure the CSMS program will have sufficient financial and organizational resources to implement necessary actions2. Therefore, jumping into detailed risk assessment without having the management buy-in is a common mistake that can jeopardize the success of the CSMS program.
NEW QUESTION # 29
Which of the following are the critical variables related to access control?
Available Choices (select all choices that are correct)
- A. Reporting and monitoring
- B. Password strength and change frequency
- C. Account management and monitoring
- D. Account management and password strength
Answer: D
Explanation:
Access control is the process of granting or denying specific requests to obtain and use information and related information processing services. 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
62443-3-3 standard, access control includes the following system requirements (SRs):
* SR 1.1: Identification and authentication control
* SR 1.2: Use control
* SR 1.3: System integrity
* SR 1.4: Data confidentiality
* SR 1.5: Restricted data flow
* SR 1.6: Timely response to events
* SR 1.7: Resource availability
Among these SRs, the ones that are most related to the critical variables of account management and password strength are SR 1.1 and SR 1.2. SR 1.1 requires that the IACS shall provide the capability to uniquely identify and authenticate all users, processes, and devices that attempt to establish a logical connection to the system. This means that the IACS should have a robust account management system that can create, modify, delete, and monitor user accounts and their privileges. It also means that the IACS should enforce strong password policies that can prevent unauthorized access or compromise of user credentials.
Password strength refers to the level of difficulty for an attacker to guess or crack a password. It depends on factors such as length, complexity, randomness, and uniqueness of the password.
SR 1.2 requires that the IACS shall provide the capability to enforce the use of logical connections in accordance with the security policy of the organization. This means that the IACS should have a mechanism to control the access rights and permissions of users, processes, and devices based on their roles, responsibilities, and needs. It also means that the IACS should have a mechanism to audit and log the activities and events related to access control, such as successful or failed login attempts, password changes, privilege escalations, or unauthorized actions.
Therefore, account management and password strength are the critical variables related to access control, as they directly affect the identification, authentication, and authorization of users, processes, and devices in 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 Cybersecurity Fundamentals Specialist Certificate Program2 ISA/IEC 62443 Cybersecurity Library3 Using the ISA/IEC 62443 Standards to Secure Your Control Systems4
NEW QUESTION # 30
As related to technical security requirements for IACS components, what does CCSC stand for?
- A. Comprehensive Component Security Controls
- B. Common Component Security Criteria
- C. Centralized Component Security Compliance
- D. Common Component Security Constraints
Answer: B
Explanation:
CCSC stands for Common Component Security Criteria, as defined in ISA/IEC 62443-4-2. These are a standardized set of technical security requirements that apply across all component types (e.g., embedded devices, software apps, network components).
"CCSCs represent baseline technical security requirements that are commonly applicable to all IACS components, regardless of their type."
- ISA/IEC 62443-4-2:2018, Clause 4.1 - Common Component Security Criteria These requirements support consistency and interoperability in component security evaluations.
References:
ISA/IEC 62443-4-2:2018 - Clause 4.1
ISA/IEC 62443-1-1 - Component types and terminology
NEW QUESTION # 31
What do the tiers in the NIST CSF represent?
- A. Stages of incident response
- B. Different types of cybersecurity software
- C. An organization's cybersecurity profile
- D. Categories of cybersecurity threats
Answer: C
Explanation:
In the NIST Cybersecurity Framework (CSF), "tiers" represent the degree to which an organization's cybersecurity risk management practices exhibit the characteristics defined in the framework (such as risk awareness, repeatability, and adaptability). Tiers range from Partial (Tier 1) to Adaptive (Tier 4) and describe the organization's overall cybersecurity maturity or profile.
Reference: NIST CSF v1.1, Section 2.2 ("Framework Implementation Tiers"); ISA/IEC 62443-1-1:2007, Section 4.2.7.
NEW QUESTION # 32
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 uses DCOM, which dynamically assigns any port between 1024 and 65535.
- C. OPC Classic works with control devices from different manufacturers.
- D. OPC Classic is allowed to use only port 80.
Answer: B
Explanation:
OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535. Comprehensive Explanation: OPC Classic is a software interface technology that uses the Distributed Component Object Model (DCOM) protocol to facilitate the transfer of data between different industrial control systems. DCOM is a Microsoft technology that allows applications to communicate across a network. However, DCOM is not designed with security in mind, and it poses several challenges for firewall configuration. One of the main challenges is that DCOM does not use fixed TCP port numbers, but rather negotiates new port numbers within the first open connection. This means that intermediary firewalls can only be used with wide-open rules, leaving a large range of ports open for potential attacks. This makes OPC Classic very "firewall unfriendly" and reduces the security and protection they provide. References:
* Tofino Security OPC Foundation White Paper
* Step 2 (for client or server): Configuring firewall settings - GE
* Secure firewall for OPC Classic - Design World
NEW QUESTION # 33
Which statement BEST describes the enforceability of standards?
- A. Standards have criminal penalties for non-compliance.
- B. Standards are always legally binding and must be followed.
- C. Courts never consider standards when determining liability.
- D. Compliance with standards is voluntary.
Answer: D
Explanation:
Standards like ISA/IEC 62443 are generally voluntary unless they are incorporated into law, regulation, or contractual obligation. However, they can be used in legal proceedings to determine whether an organization met its duty of care.
"Compliance with standards is generally voluntary, but standards may become mandatory if referenced in laws, regulations, or contracts. Courts may consider them in liability cases."
- ISA/IEC 62443-1-1:2007 - Clause 5.3 - Relationship to Regulatory Requirements Therefore, while not automatically legally binding, standards can have significant regulatory and legal influence.
References:
ISA/IEC 62443-1-1:2007 - Clause 5.3
ISO/IEC Guide 2 - Terminology for standardization
NEW QUESTION # 34
Who must be included in a training and security awareness program?
Available Choices (select all choices that are correct)
- A. Employees
- B. All personnel
- C. Vendors and suppliers
- D. Temporary staff
Answer: B
Explanation:
Modbus over Ethernet, also known as Modbus/TCP, is a protocol that encapsulates the Modbus/RTU data string inside the data section of the TCP frame. It then sets up a client/server exchange between nodes, using TCP/IP addressing to establish connections1. This makes it easy to manage in a firewall, because the firewall can filter the traffic based on the source and destination IP addresses and the TCP port number. The default TCP port for Modbus/TCP is 502, but it can be changed if needed. Modbus/TCP does not use any other ports or protocols, so the firewall rules can be simple and specific. References:
* 8: Open Modbus/TCP Specification, RTA Automation, 2010.
* [9]: Modbus Application Protocol Specification V1.1b3, Modbus Organization, 2012.
NEW QUESTION # 35
What are the two elements of the risk analysis category of an IACS?
- A. Business rationale and risk identification and classification
- B. Business recovery and risk elimination or mitigation
- C. Risk evaluation and risk identification
- D. Business rationale and risk reduction and avoidance
Answer: A
Explanation:
According to ISA/IEC 62443-3-2, the risk analysis phase in the IACS security lifecycle includes both the business rationale and the risk identification and classification. This ensures that risk decisions are based not only on technical vulnerability but also on business impact and operational context.
"The risk analysis process includes identification and classification of risks based on a defined business rationale. This ensures that the protection requirements are aligned with the organization's risk tolerance and operational priorities."
- ISA/IEC 62443-3-2:2020, Section 6.4 - Risk Assessment and SL Targeting The term business rationale refers to understanding the value and criticality of the asset or system in order to make informed security decisions.
References:
ISA/IEC 62443-3-2:2020 - Section 6.4
ISA/IEC 62443-2-1 - Section 4.3.2: Risk and business continuity alignment
NEW QUESTION # 36
Which layer specifies the rules for Modbus Application Protocol
Available Choices (select all choices that are correct)
- A. Data link layer
- B. Session layer
- C. Application layer
- D. Presentation layer
Answer: C
Explanation:
The Modbus Application Protocol is a messaging protocol that provides client/server communication between devices connected on different types of buses or networks. It is positioned at level 7 of the OSI model, which is the application layer. The application layer is the highest level of the OSI model and defines the rules and formats for data exchange between applications. The Modbus Application Protocol is independent of the underlying communication layers and can be implemented using different transport protocols, such as TCP/IP, serial, or Modbus Plus. The Modbus Application Protocoldefines the function codes, data formats, and error codes for Modbus transactions123 References:
* MODBUS APPLICATION PROTOCOL SPECIFICATION V1
* Modbus - Wikipedia
* Overview of Modbus - EPICS support for Modbus - GitHub Pages
NEW QUESTION # 37
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