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NEW QUESTION # 129
Why were PLCs originally designed?
- A. To improve Ethernet functionality
- B. To service I/O exclusively
- C. To replace relays
- D. To enhance network security
Answer: C
Explanation:
Programmable Logic Controllers (PLCs) were originally designed to replace relay-based control systems in industrial automation. Early manufacturing and process control systems relied on hard-wired relays, timers, and sequencers, which were inflexible and difficult to modify. PLCs offered a software-based alternative that could easily be reprogrammed for various automation tasks, making plant operations more efficient and flexible. Their purpose was not specifically to enhance network security or Ethernet functionality, but rather to modernize and simplify control logic implementation.
Reference: ISA/IEC 62443-1-1:2007, Section 3.2.2; IEC 61131-3, Foreword and Introduction.
NEW QUESTION # 130
What is the name of the protocol that implements serial Modbus over Ethernet?
Available Choices (select all choices that are correct)
- A. MODBUS/TCP
- B. MODBUS/Ethernet
- C. MODBUS/CIP
- D. MODBUS/Plus
Answer: A
Explanation:
MODBUS/TCP is the name of the protocol that implements serial Modbus over Ethernet. MODBUS/TCP is a variant of the Modbus protocol that uses the Transmission Control Protocol (TCP) as the transport layer to encapsulate Modbus messages and send them over Ethernet networks. MODBUS/TCP preserves the Modbus application layer and data model, which means that serial Modbus devices can communicate with MODBUS/TCP devices through a gateway or a converter. MODBUS/TCP is widely used in industrial automation and control systems, as it offers high performance, interoperability, and compatibility with existing Modbus devices. References: ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section
3.1.21; MODBUS Application Protocol Specification V1.1b3, Section 1.1
NEW QUESTION # 131
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. Immediate jump into detailed risk assessment
- C. Organizational lack of communication
- D. Failure to relate to the mission of the organization
Answer: B
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 # 132
Which characteristic is MOST closely associated with the deployment of a demilitarized zone (DMZ)?
Available Choices (select all choices that are correct)
- A. Level 4 systems must use the DMZ to communicate with Level 3 and below.
- B. Email is prevented, thereby mitigating the risk of phishing attempts.
- C. Internet access through the firewall is allowed.
- D. Level 0 can only interact with Level 1 through the firewall.
Answer: A
NEW QUESTION # 133
Which is the PRIMARY reason why Modbus over Ethernet is easy to manaqe in a firewall?
Available Choices (select all choices that are correct)
- A. Modbus uses a single master to communicate with multiple slaves usinq simple commands.
- B. Modbus is a proprietary protocol that is widely supported by vendors.
- C. Modbus uses explicit source and destination IP addresses and a sinqle known TCP port.
- D. Modbus has no known security vulnerabilities, so firewall rules are simple to implement.
Answer: C
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 # 134
Which analysis method is MOST frequently used as an input to a security risk assessment?
Available Choices (select all choices that are correct)
- A. Job Safety Analysis
- B. Process Hazard Analysis (PHA)
- C. System Safety Analysis(SSA)
- D. Failure Mode and Effects Analysis
Answer: B
Explanation:
A Process Hazard Analysis (PHA) is a systematic method of identifying and evaluating the potential hazards associated with an industrial process. A PHA can help to identify the sources of cyber threats, the consequences of cyber incidents, and the existing safeguards and mitigation measures. A PHA is most frequently used as an input to a security risk assessment because it provides a comprehensive and structured overview of the process and its risks, which can then be used to determine the security level targets and security countermeasures for the industrial automation and control system (IACS). A PHA can also help to align the security objectives with the safety objectives of the process, and to ensure that the security measures do not compromise the safety or operability of the process. References:
* ISA/IEC 62443 Standards to Secure Your Industrial Control System, page 10
* Using the ISA/IEC 62443 Standard to Secure Your Control System, page 17
NEW QUESTION # 135
After receiving an approved patch from the JACS vendor, what is BEST practice for the asset owner to follow?
- A. If no problems are experienced with the current IACS, it is not necessary to apply the patch.
- B. If a medium priority, schedule the installation within three months after receipt.
- C. If a high priority, apply the patch at the first unscheduled outage.
- D. If a low priority, there is no need to apply the patch.
Answer: C
Explanation:
According to the ISA/IEC 62443 Cybersecurity Fundamentals Specialist resources, patches are software updates that fix bugs, vulnerabilities, or improve performance of a system. Patches are classified into three categories based on their urgency and impact: low, medium, and high. Low priority patches are those that have minimal or no impact on the system functionality or security, and can be applied at the next scheduled maintenance. Medium priority patches are those that have moderate impact on the system functionality or security, and should be applied within a reasonable time frame, such as three months. High priority patches are those that have significant or critical impact on the system functionality or security, and should be applied as soon as possible, preferably at the first unscheduled outage. Applying patches in a timely manner is a best practice for maintaining the security and reliability of an industrial automation and control system (IACS).
References:
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section 4.3.2, Patch Management
* ISA/IEC 62443-2-1:2009, Security for industrial automation and control systems - Part 2-1:
Establishing an industrial automation and control systems security program, Clause 5.3.2.2, Patch management
* ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels, Clause 4.3.3.6.2, Patch management
NEW QUESTION # 136
Which of the following is a cause for the increase in attacks on IACS?
Available Choices (select all choices that are correct)
- A. Fewer personnel with system knowledge having access to IACS
- B. Knowledge of exploits and tools readily available on the Internet
- C. Use of proprietary communications protocols
- D. The move away from commercial off the shelf (COTS) systems, protocols, and networks
Answer: D
NEW QUESTION # 137
Which of the ISA 62443 standards focuses on the process of developing secure products?
Available Choices (select all choices that are correct)
- A. 62443-4-1
- B. 62443-3-3
- C. 62443-3-2
- D. 62443-1-1
Answer: A
Explanation:
The ISA/IEC 62443 series of standards is divided into four main parts, each covering a different aspect of industrial automation and control systems (IACS) cybersecurity1:
* Part 1: Terminology, Concepts, and Models
* Part 2: Policies and Procedures
* Part 3: System Requirements
* Part 4: Component Requirements The part 4 of the series focuses on the requirements for the secure development and maintenance of products that are used in IACS, such as controllers, sensors, actuators, network devices, software applications, and cloud services. The part 4 consists of two standards1:
NEW QUESTION # 138
Which is a commonly used protocol for managing secure data transmission on the Internet?
Available Choices (select all choices that are correct)
- A. Microsoft Point-to-Point Encryption
- B. Datagram Transport Layer Security (DTLS)
- C. Secure Telnet
- D. Secure Sockets Layer
Answer: B,D
Explanation:
Datagram Transport Layer Security (DTLS) and Secure Sockets Layer (SSL) are both commonly used protocols for managing secure data transmission on the Internet. DTLS is a variant of SSL that is designed to work over datagram protocols such as UDP, which are used for real-time applications such as voice and video.
SSL is a protocol that provides encryption, authentication, and integrity for data transmitted over TCP, which is used for reliable and ordered delivery of data. Both DTLS and SSL use certificates and asymmetric cryptography to establish a secure session between the communicating parties, and then use symmetric cryptography to encrypt the data exchanged. DTLS and SSL are widely used in web browsers, email clients, VPNs, and other applications that require secure communication over the Internet. References:
* ISA/IEC 62443 Standards to Secure Your Industrial Control System, Module 3: Introduction to Cryptography, pages 3-5 to 3-7
* Using the ISA/IEC 62443 Standards to Secure Your Control System, Chapter 6: Securing Communications, pages 125-126
NEW QUESTION # 139
Which of the following BEST describes 'Vulnerability'?
- A. The result that occurs from a particular incident
- B. An event that could breach security
- C. An exploitable flaw in management
- D. The potential for violation of security
Answer: D
Explanation:
According to ISA/IEC 62443-1-1, a vulnerability is defined as "the potential for violation of security," which means a weakness or gap in protection efforts that could be exploited by threats to gain unauthorized access or cause harm to an IACS. It does not specifically mean an event (B) or a result (D), and it is broader than just management flaws (A). The identification and management of vulnerabilities are key steps in risk assessment and mitigation in the 62443 framework.
Reference: ISA/IEC 62443-1-1:2007, Section 3.3, Glossary ("vulnerability" definition).
NEW QUESTION # 140
When selecting a risk assessment methodology for a complex industrial automation system, which approach aligns BEST with ISA/IEC 62443 guidance?
- A. Use different methodologies for initial and detailed assessments to cover more perspectives.
- B. Follow any documented methodology as long as it uses a consistent risk ranking scale.
- C. Avoid using standards or frameworks to maintain flexibility.
- D. Only perform qualitative assessments without quantitative measures.
Answer: B
Explanation:
ISA/IEC 62443-3-2 states that while it doesn't mandate a specific risk methodology, the chosen approach must be documented, consistent, and based on a risk ranking scale that enables the comparison and prioritization of security needs.
"Any documented risk assessment methodology may be used, provided it results in a repeatable risk ranking and includes asset, threat, and vulnerability evaluation."
- ISA/IEC 62443-3-2:2020, Clause 6.4.1 - Risk Assessment Methodology
This ensures compatibility with SL-T (Target Security Level) assignment and zone/conduit design. Flexibility is allowed, but methodology must be traceable and consistently applied.
References:
ISA/IEC 62443-3-2:2020 - Clause 6.4.1
ISA/IEC 62443-2-1 - Organizational guidance for risk assessments
NEW QUESTION # 141
Which is a physical layer standard for serial communications between two or more devices?
Available Choices (select all choices that are correct)
- A. RS435
- B. RS235
- C. RS432
- D. RS232
Answer: D
Explanation:
RS232 is a physical layer standard for serial communication between two or more devices. It defines the electrical characteristics, timing, and pinout of connectors for serial data transmission. RS232 is widely used in industrial communication devices, such as PLCs, measuring instruments, and network servers. RS232 allows only one master and one slave to communicate on each line, and operates in a full duplex mode. RS232 haslower transmission speed, shorter maximum cable length, and larger voltage swing than later standards such as RS422 and RS485123 References: 1: Basics of RS232, RS422, and RS485 Serial Communication 2: RS-232 - Wikipedia 3: RS232 Serial Communication Protocol: Basics, Working & Specifications
NEW QUESTION # 142
What is the primary focus of Part 3-2 in the ISA/IEC 62443 series?
- A. Cybersecurity risk assessment and system design
- B. Security technologies for IACS
- C. Secure product development lifecycle requirements
- D. Technical security requirements for IACS components
Answer: A
Explanation:
ISA/IEC 62443-3-2 focuses on the cybersecurity risk assessment process, including:
Identifying zones and conduits
Determining the Target Security Levels (SL-T)
Designing the IACS architecture based on risk-based zoning
"Part 3-2 defines a process for conducting cybersecurity risk assessments and designing system architectures that incorporate zones and conduits based on those risks."
- ISA/IEC 62443-3-2:2020, Clause 5 - Risk Assessment Process
This part bridges the gap between risk evaluation and technical implementation.
References:
ISA/IEC 62443-3-2:2020 - Clauses 5.2 to 5.5
ISA/IEC 62443-1-1 - Framework overview
NEW QUESTION # 143
Which is a physical layer standard for serial communications between two or more devices?
Available Choices (select all choices that are correct)
- A. RS435
- B. RS235
- C. RS432
- D. RS232
Answer: A
NEW QUESTION # 144
Which of the following can be employed as a barrier device in a segmented network?
Available Choices (select all choices that are correct)
- A. Domain controller
- B. Unmanaged switch
- C. VPN
- D. Router
Answer: D
NEW QUESTION # 145
Which of the ISA 62443 standards focuses on the process of developing secure products?
Available Choices (select all choices that are correct)
- A. 62443-4-1
- B. 62443-3-3
- C. 62443-3-2
- D. 62443-1-1
Answer: A
NEW QUESTION # 146
Which is the implementation of PROFIBUS over Ethernet for non-safetv-related communications?
Available Choices (select all choices that are correct)
- A. PROF1SAFE
- B. PROFIBUS PA
- C. PROFIBUS DP
- D. PROFINET
Answer: D
NEW QUESTION # 147
Which of the following technologies is no longer considered secure?
- A. Digital Encryption Standard (DES)
- B. Advanced Encryption Standard (AES)
- C. Secure Sockets Layer (SSL)
- D. Transport Layer Security (TLS)
Answer: C
Explanation:
Secure Sockets Layer (SSL) is no longer considered secure due to known vulnerabilities and cryptographic weaknesses. Modern standards require the use of newer versions of Transport Layer Security (TLS), and similarly, DES is deprecated for strong security. However, the best and most universally referenced example is SSL, as major industry and regulatory bodies recommend disabling SSL entirely in favor of TLS 1.2 or above.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3.7 ("Cryptographic protections"); NIST SP 800-52 Rev. 2.
NEW QUESTION # 148
Who is responsible for defining the tolerable residual cybersecurity risk as an input requirement for all activities?
- A. Maintenance service provider
- B. Integration service provider
- C. Product supplier
- D. Asset owner
Answer: D
Explanation:
According to the ISA/IEC 62443 series, it is the asset owner's responsibility to determine what level of residual cybersecurity risk is acceptable after mitigation strategies are applied. This value becomes a key input in defining security levels and selecting controls.
"The asset owner is responsible for defining the tolerable residual risk and establishing acceptable security levels based on business impact and risk tolerance."
- ISA/IEC 62443-3-2:2020, Clause 6.4.2 - Risk Evaluation Inputs
This forms the foundation for SL-T (Target Security Level) determination.
References:
ISA/IEC 62443-3-2:2020 - Clause 6.4.2
ISA/IEC 62443-2-1:2010 - Asset owner roles and responsibilities
NEW QUESTION # 149
Which of the following is an activity that should trigger a review of the CSMS?
Available Choices (select all choices that are correct)
- A. Security incident exposing previously unknown risk.
- B. Budgeting
- C. New technical controls
- D. Organizational restructuring
Answer: A
NEW QUESTION # 150
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