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ISA-IEC-62443 Dump File & Examcollection ISA-IEC-62443 Questions Answers

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q142-Q147):

NEW QUESTION # 142
Which of the following is an example of separation of duties as a part of system development and maintenance?
Available Choices (select all choices that are correct)

A. Developers write and then test their own code.
B. Configuration settings are made by one party and self-reviewed using a checklist.
C. Changes are approved by one party and implemented by another.
D. Design and implementation are performed by the same team.

Answer: C

Explanation:
Separation of duties is a security principle that aims to prevent fraud, errors, conflicts of interest, or misuse of resources by dividing critical tasks or functions among different people or teams. 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 62443-2-1 standard, separation of duties includes the following system requirements (SRs):
* SR 2.1: Security management policy
* SR 2.2: Personnel security
* SR 2.3: System development and maintenance
* SR 2.4: Incident response and recovery
* SR 2.5: Compliance and review
Among these SRs, the one that is most related to the example of system development and maintenance is SR
2.3. SR 2.3 requires that the IACS shall provide the capability to ensure that the development and maintenance of the system and its components are performed in a secure manner. This means that the IACS should have a mechanism to control the access and authorization of developers, testers, integrators, and maintainers who work on the system and its components. It also means that the IACS should have a mechanism to verify and validate the quality and security of the system and its components before, during, and after the development and maintenance processes.
Therefore, an example of separation of duties as a part of system development and maintenance is that changes are approved by one party and implemented by another. This ensures that the changes are authorized, documented, and reviewed by someone who is not involved in the implementation. This reduces the risk of introducing errors, vulnerabilities, or malicious code into the system and its components.
References:
* ISA/IEC 62443-2-1:2010, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program1
* 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 # 143
Which of the following BEST describes a control system?

A. Hardware and software components of an IACS
B. Actions to prevent loss of revenue
C. Measures taken to protect against unauthorized access
D. Unauthorized modifications to data

Answer: A

Explanation:
A control system, particularly in the context of IACS, is defined as a collection of hardware and software components used to monitor and control industrial processes. This includes PLCs, RTUs, SCADA software, HMIs, and communication networks.
"Control system: A set of hardware and software components that work together to monitor and control industrial or process operations."
- ISA/IEC 62443-1-1:2007, Clause 3.3.5 - Terminology
While the other options describe security functions or consequences, only Option C accurately describes what a control system is.
References:
ISA/IEC 62443-1-1:2007 - Clause 3.3.5
ISA/IEC 62443-2-1 - Asset definitions

NEW QUESTION # 144
Why is OPC Classic considered firewall unfriendly?
Available Choices (select all choices that are correct)

A. OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535.
B. OPC Classic is an obsolete communication standard.
C. OPC Classic is allowed to use only port 80.
D. OPC Classic works with control devices from different manufacturers.

Answer: A

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 # 145
What are the connections between security zones called?
Available Choices (select all choices that are correct)

A. Conduits
B. Firewalls
C. Pathways
D. Tunnels

Answer: A

NEW QUESTION # 146
What is the primary focus of Part 3-2 in the ISA/IEC 62443 series?

A. Secure product development lifecycle requirements
B. Cybersecurity risk assessment and system design
C. Security technologies for IACS
D. Technical security requirements for IACS components

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 # 147
......

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