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ISA-IEC-62443 Valid Test Papers, ISA-IEC-62443 Actual Test Pdf

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q95-Q100):

NEW QUESTION # 95
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. Failure Mode and Effects Analysis
C. Process Hazard Analysis (PHA)
D. System Safety Analysis (SSA)

Answer: C

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 # 96
Which ISA/IEC 62443 part covers technical security requirements used by product suppliers, integration service providers, and asset owners?

A. ISA/IEC 62443-2-1
B. ISA/IEC 62443-2-4
C. ISA/IEC 62443-4-2
D. ISA/IEC 62443-3-3

Answer: D

Explanation:
ISA/IEC 62443-3-3 defines system-level security requirements applicable across roles.
Step 1: System focus
Part 3-3 specifies technical security requirements for IACS systems, independent of who implements them.
Step 2: Multi-role applicability
These requirements are used by:
* Product suppliers (design alignment)
* System integrators (implementation)
* Asset owners (operation and verification)
Step 3: Distinction from other parts
* 2-1 focuses on management systems
* 2-4 focuses on service providers
* 4-2 focuses on component-level requirements
Thus, Option C is correct.

NEW QUESTION # 97
An industrial facility wants to ensure that only authorized systems reach its PLCs while minimizing disruption to time-sensitive control processes. Which type of firewall would BEST suit this need?

A. General-purpose software firewall
B. Basic packet filter firewall without protocol awareness
C. Unidirectional gateway (data diode)
D. IACS-specific firewall with deep packet inspection

Answer: D

Explanation:
For industrial networks, the most effective approach is to use IACS-specific firewalls that perform deep packet inspection (DPI) of industrial protocols (e.g., Modbus, DNP3, OPC UA).
"Industrial-specific firewalls with DPI capabilities can inspect control system protocols and enforce granular access control without disrupting time-sensitive operations."
- ISA/IEC 62443-3-3:2013, SR 5.1 - Zone Boundary Protection
Unlike generic IT firewalls, IACS-specific firewalls:
Understand OT protocols
Enforce real-time constraints
Support deterministic traffic flows
References:
ISA/IEC 62443-3-3:2013 - SR 5.1
ISA/IEC 62443-1-1 - Zone and conduit protection technologies

NEW QUESTION # 98
Why is OPC Classic considered firewall unfriendly?

A. It works with control devices from different manufacturers.
B. It allows use of only port 80.
C. It dynamically assigns several ports.
D. It is an obsolete communication standard.

Answer: C

Explanation:
OPC Classic uses Microsoft's DCOM (Distributed Component Object Model) for communication, which dynamically opens multiple ports, making it extremely difficult to manage with firewalls.
"OPC Classic is firewall-unfriendly because DCOM requires dynamic port negotiation, making it difficult to define consistent firewall rules."
- ISA/IEC 62443-3-3:2013, Annex A - Communication Protocols and Security Concerns This lack of port predictability presents a significant security and operational risk, which led to the development of OPC UA, which uses fixed ports and supports encryption.
References:
ISA/IEC 62443-3-3 - Annex A
OPC Foundation Security Guidelines

NEW QUESTION # 99
What type of security level defines what a component or system is capable of meeting?
Available Choices (select all choices that are correct)

A. Capability security level
B. Design security level
C. Achieved security level
D. Target security level

Answer: A

Explanation:
According to the IEC 62443 standard, a capability security level (SL-C) is defined as "the security level that a component or system is capable of meeting when it is properly configured and protected by an appropriate set of security countermeasures" 1. A component or system can have different SL-Cs for different security requirements, depending on its design and implementation. The SL-C is determined by testing the component or system against a set of security test cases that correspond to the security requirements. The SL-C is not dependent on the actual operational environment orconfiguration of the component or system, but rather on its inherent capabilities. References:
* IEC 62443 - Wikipedia

NEW QUESTION # 100
......

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