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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q19-Q24):

NEW QUESTION # 19
Why is patch management more difficult for IACS than for business systems?
Available Choices (select all choices that are correct)

A. Overtime pay is required for technicians.
B. Many more approvals are required.
C. Business systems automatically update.
D. Patching a live automation system can create safety risks.

Answer: D

Explanation:
Patch management is the process of applying software updates to fix security vulnerabilities, improve functionality, or enhance performance. Patch management is an essential part of cybersecurity, as unpatched systems can be exploited by malicious actors. However, patch management for industrial automation and control systems (IACS) is more challenging than for business systems, because patching a live automation system can create safety risks. According to the ISA/IEC 62443 standards, patching an IACS may have the following potential impacts1:
* Patching may introduce new vulnerabilities or errors that compromise the availability, integrity, or confidentiality of the IACS.
* Patching may affect the functionality or performance of the IACS, causing unexpected or undesired behavior, such as process shutdowns, slowdowns, or failures.
* Patching may require downtime or reduced operation of the IACS, which may affect production, quality, or profitability.
* Patching may require additional resources, such as personnel, equipment, or testing facilities, which may not be readily available or affordable.
Therefore, patch management for IACS requires careful planning, testing, and validation before applying patches to the operational environment. The ISA/IEC 62443 standards provide guidance and best practices for patch management in the IACS environment, such as1:
* Establishing a patch management program that defines roles, responsibilities, policies, and procedures
* for patching IACS components and systems.
* Identifying and prioritizing the IACS assets that need patching, based on their criticality, vulnerability, and risk level.
* Evaluating and verifying the patches for compatibility, functionality, and security before applying them to the IACS.
* Implementing and documenting the patching process, including backup, recovery, and rollback procedures, in case of patch failure or adverse effects.
* Monitoring and auditing the patching activities and outcomes, and reporting any issues or incidents.
References: 1: ISA TR62443-2-3 - Security for industrial automation and control systems, Part 2-3: Patch management in the IACS environment

NEW QUESTION # 20
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 works with control devices from different manufacturers.
C. OPC Classic is allowed to use only port 80.
D. OPC Classic is an obsolete communication standard.

Answer: A

NEW QUESTION # 21
Security Levels (SLs) are broken down into which three types?
Available Choices (select all choices that are correct)

A. Target.capability, and availability
B. Target.capacity, and achieved
C. Target.capability, and achieved
D. SL-1, SL-2, and SL-3

Answer: C

Explanation:
Security Levels (SLs) are a way of expressing the security performance of an industrial automation and control system (IACS) or its components. SLs are broken down into three types: target, capability, and achieved1.
* Target SL is the level of security performance that is required for a system or component to protect against a specific threat scenario. The target SL is determined by conducting a risk assessment that considers the likelihood and impact of potential security incidents1.
* Capability SL is the level of security performance that a system or component can provide based on its design and implementation. The capability SL is determined by evaluating the security functions and features of the system or component against a set of security requirements1.
* Achieved SL is the level of security performance that a system or component actually provides in its operational environment. The achieved SL is determined by verifying that the system or component is properly installed, configured, maintained, and monitored1.
References: ISA/IEC 62443 Standards to Secure Your Industrial Control System, page 3-4.

NEW QUESTION # 22
What is the name of the missing layer in the Open Systems Interconnection (OSI) model shown below?

A. Control
B. Transport
C. Protocol
D. User

Answer: B

Explanation:
The Open Systems Interconnection (OSI) model is a framework that describes the functions of a networking system. The OSI model categorizes the computing functions of the different network components, outlining the rules and requirement needed to support the interoperability of the software and hardware that make up the network1.
The OSI model consists of seven abstraction layers arranged in a top-down order: Physical, Data Link, Network, Transport, Session, Presentation, and Application. The Transport layer is the fourth layer in the OSI model, and it is responsible for ensuring reliable and efficient data transfer between the Network layer and the Session layer2. The Transport layer uses protocols such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) to provide end-to-end communication services, such as error detection and correction, flow control, congestion control, and segmentation2.
The image that you sent shows a 3D representation of the OSI model, with the layers stacked on top of each other. The missing layer is the Transport layer, which is represented by a pink box with a white arrow pointing to it. The arrow is labeled "TCP, UDP".
1: What is the OSI Model? 7 Network Layers Explained | Fortinet 2: What is OSI Model | 7 Layers Explained
- GeeksforGeeks

NEW QUESTION # 23
Which of the following is an industry sector-specific standard?
Available Choices (select all choices that are correct)

A. ISO 27001
B. API 1164
C. NIST SP800-82
D. ISA-62443 (EC 62443)

Answer: B

NEW QUESTION # 24
......

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