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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q119-Q124):

NEW QUESTION # 119
What is Modbus?

A. A programming language
B. A type of industrial machinery
C. A network security standard
D. A serial communications protocol

Answer: D

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 # 120
Which of the following is the BEST example of detection-in-depth best practices?
Available Choices (select all choices that are correct)

A. Role-based access control and unusual data transfer patterns
B. Role-based access control and VPNs
C. IDS sensors deployed within multiple zones in the production environment
D. Firewalls and unexpected protocols being used

Answer: C

NEW QUESTION # 121
In which layer is the physical address assigned?
Available Choices (select all choices that are correct)

A. Layer 3
B. Layer 7
C. Layer 2
D. Layer 1

Answer: C

Explanation:
According to the OSI model, the physical address is assigned in the layer 2, also known as the data link layer.
The physical address is a unique identifier for each device on a network, such as a MAC address or a serial number. The data link layer is responsible for transferring data between adjacent nodes on a network, using the physical address to identify the source and destination of each frame. The data link layer also provides error detection and correction, flow control, and media access control. References: ISA/IEC 62443 Cybersecurity Fundamentals Specialist Exam Prep, section 2.2; ISA/IEC 62443 Standards to Secure Your Industrial Control System, section 3.1.2.

NEW QUESTION # 122
In a defense-in-depth strategy, what is the purpose of role-based access control?
Available Choices (select all choices that are correct)

A. Ensures that users can access only certain devices on the network
B. Ensures that users can access only the functions they need for their job
C. Ensures that users can access systems from remote locations
D. Ensures that users correctly manage their username and password

Answer: B

Explanation:
Role-based access control (RBAC) is a method of restricting access to resources based on the roles of individual users within an organization. RBAC assigns permissions and responsibilities to roles, rather than to individual users, and then assigns users to those roles. This way, users can only perform the actions that are relevant and necessary for their role, and not access or modify any other resources that are beyond their scope of authority. RBAC is one of the security countermeasures that can be implemented in a defense-in-depth strategy, which is a layered approach to protect industrial automation and control systems (IACS) from cyber threats. RBAC can help prevent unauthorized access, misuse, or sabotage of IACS resources, as well as reduce the risk of human error or insider attacks.
References:
ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels, Clause 5.3.2.11 ISA/IEC 62443-2-1:2010, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program, Clause 6.2.2.32 ISA/IEC 62443-4-1:2018, Security for industrial automation and control systems - Part 4-1: Product security development life-cycle requirements, Clause 5.2.3.23 ISA/IEC 62443-4-2:2019, Security for industrial automation and control systems - Part 4-2: Technical security requirements for IACS components, Clause 4.2.3.24

NEW QUESTION # 123
What type of attack is characterized by encrypting an organization's data and demanding payment for restoration?

A. Ransomware
B. Malware variant
C. DDoS attack
D. Phishing

Answer: A

Explanation:
Ransomware is a type of malicious software (malware) designed to block access to a computer system or data, typically by encrypting files, until a sum of money (ransom) is paid. This form of attack is increasingly targeting industrial automation and control system (IACS) environments due to the critical nature of these systems. Unlike phishing (which tricks users into revealing sensitive information) or DDoS attacks (which disrupt availability), ransomware specifically encrypts data and extorts the victim.
Reference: ISA/IEC 62443-3-2:2020, Annex B; ISA/IEC 62443-1-1:2007, Section 3.2.2; ISA/IEC 62443-2-1:
2009, Section 4.2.3.

NEW QUESTION # 124
......

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