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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q116-Q121):
NEW QUESTION # 116
Which Security Level (SL) would be MOST appropriate for a system that requires protection against attackers with high motivation and extended resources using sophisticated means?
Answer: C
Explanation:
SL4 is the highest Security Level defined in ISA/IEC 62443 and is intended to defend against:
Highly motivated attackers
Those with extensive resources
Capable of using sophisticated techniques
"SL4 provides protection against intentional violation using sophisticated means with extended resources, high motivation, and IACS-specific knowledge."
- ISA/IEC 62443-3-3:2013, Table 3 - Security Level Definitions
This level is typically reserved for critical infrastructure or national security environments.
References:
ISA/IEC 62443-3-3:2013 - Table 3
ISA/IEC 62443-1-1 - SL Overview and Definitions
NEW QUESTION # 117
What is a key activity in the Maintain phase?
Answer: C
Explanation:
The "Maintain" phase is the fourth phase of the IACS Cybersecurity Lifecycle described in ISA/IEC 62443-2-
1. A key activity in this phase is managing changes (also known as "change management"). This activity ensures that any modifications to the IACS environment (hardware, software, processes, etc.) are evaluated for cybersecurity impact, and proper controls are implemented to maintain the intended security posture.
While risk assessment is typically done in the Assess phase, and allocating assets and designing countermeasures belong to earlier phases, managing changes is essential for ensuring ongoing compliance and effectiveness of cybersecurity controls over time.
Reference: ISA/IEC 62443-2-1:2009, Section 5.6 (Maintain Phase), Table 3 (CSMS lifecycle activities).
NEW QUESTION # 118
Which is the PRIMARY reason why Modbus over Ethernet is easy to manaqe in a firewall?
Available Choices (select all choices that are correct)
Answer: D
Explanation:
According to the ISA/IEC 62443-2-4 standard, a training and security awareness program should include all personnel who have access to the industrial automation and control system (IACS) or who are involved in its operation, maintenance, or management. This includes vendors and suppliers, employees, temporary staff, contractors, and visitors. The purpose of the program is to ensure that all personnel are aware of the security risks and policies related to the IACS, and that they have the necessary skills and knowledge to perform their roles in a secure manner. The program should also cover the roles and responsibilities of different personnel, the reportingprocedures for security incidents, and the best practices for security hygiene. References:
* ISA/IEC 62443-2-4:2015 - Security for industrial automation and control systems - Part 2-4: Security program requirements for IACS service providers1
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Training Course2
NEW QUESTION # 119
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)
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 # 120
What is the formula for calculating risk?
Answer: D
Explanation:
The formula for risk in ISA/IEC 62443 is typically expressed as:
Risk = Threat × Vulnerability × Consequence
This means that risk is a product of the likelihood that a threat will exploit a vulnerability and the impact (consequence) if that event occurs. This formula is consistently used in both the general information security domain and explicitly referenced in the ISA/IEC 62443-3-2 standard in the context of IACS risk assessments.
Reference: ISA/IEC 62443-3-2:2020, Section 5.2 ("Risk is typically calculated as Threat × Vulnerability × Consequence"); ISA/IEC 62443-2-1:2009, Section 5.2.4.
NEW QUESTION # 121
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