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[General] Reliable ISA-IEC-62443 Test Book & ISA-IEC-62443 Exam Pass4sure

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【General】 Reliable ISA-IEC-62443 Test Book & ISA-IEC-62443 Exam Pass4sure

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q127-Q132):NEW QUESTION # 127
What is the name of the protocol that implements serial Modbus over Ethernet?
Available Choices (select all choices that are correct)
  • A. MODBUS/Plus
  • B. MODBUS/CIP
  • C. MODBUS/TCP
  • D. MODBUS/Ethernet
Answer: C
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 # 128
Which of the following BEST describes 'Vulnerability'?
  • A. An exploitable flaw in management
  • B. The potential for violation of security
  • C. The result that occurs from a particular incident
  • D. An event that could breach security
Answer: B
Explanation:
According to IEC 62443-1-1, a vulnerability is defined as:
"A weakness in an asset or in the protective measures associated with that asset that can be exploited by a threat source." More broadly, it represents the potential for a violation of security, rather than a guaranteed breach or specific event.
This aligns with the understanding in cybersecurity risk management - a vulnerability does not equate to an incident or result, but rather a potential that could be exploited.
Incorrect Options:
A). An exploitable flaw in management - Too narrow; vulnerabilities exist in systems, software, devices, not just management.
B). An event that could breach security - That's a threat, not a vulnerability.
D). The result that occurs from a particular incident - That would be considered a consequence or impact, not the vulnerability itself.
References:
ISA/IEC 62443-1-1:2007 - "Terminology, Concepts, and Models"
ISA/IEC 62443 Study Guide

NEW QUESTION # 129
In terms of availability requirements, how do IACS and IT differ?
  • A. Rebooting is never acceptable in IT but tolerated in IACS.
  • B. Both IACS and IT have the same availability requirements.
  • C. Continuous operation is expected in IT while scheduled operation is sufficient for IACS.
  • D. IACS tolerates occasional failures while IT does not.
Answer: C
Explanation:
The ISA/IEC 62443 standards explain that continuous operation is often required in IT systems (such as data centers and online services), but for IACS environments, scheduled operation (for example, planned maintenance windows) is typically sufficient. IACS systems may accept limited downtime for maintenance, but require high availability during production runs.
Reference: ISA/IEC 62443-1-1:2007, Section 4.4.4 ("Availability in IACS and IT contexts"); Table 7 (Comparison of IT and IACS requirements).

NEW QUESTION # 130
How many element groups are in the "Addressing Risk" CSMS category?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Answer: C
Explanation:
In ISA/IEC 62443-2-1, the Cyber Security Management System (CSMS) includes multiple categories. One of these is "Addressing Risk", which is composed of 4 element groups, as outlined in Figure 3 - CSMS Elements of the standard.
The 4 element groups under "Addressing Risk" are:
Risk analysis and management
Security policy, organization, and awareness
Selected security countermeasures
Personnel security
"The Addressing Risk category of the CSMS consists of four element groups: risk analysis and management, security policy and awareness, selected countermeasures, and personnel security."
- ISA/IEC 62443-2-1:2010, Figure 3 and Clause 4.2.2
References:
ISA/IEC 62443-2-1:2010 - Clause 4.2.2 and Figure 3
ISA/IEC 62443-1-1 - Supporting definitions

NEW QUESTION # 131
The Risk Analysis category contains background information that is used where?
Available Choices (select all choices that are correct)
  • A. Many other elements in the CSMS
  • B. Only the Assessment element
  • C. (Elements external to the CSMS
  • D. Only the Risk ID element
Answer: A
Explanation:
The Risk Analysis category contains background information that is used to identify and assess the risks associated with the cyber-physical system (CPS) under consideration. This information includes the system description, the threat model, the vulnerability analysis, the risk assessment method, and the risk acceptance criteria. The Risk Analysis category is used as an input for many other elements in the CSMS, such as the Risk ID, Risk Reduction, Risk Acceptance, and Risk Monitoring elements. The Risk Analysis category provides the basis for the risk management process and helps to ensure a consistent and systematic approach to cybersecurity in the CPS. References:
* Using the ISA/IEC 62443 Standards to Secure Your Control System, page 13
* [ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide], page 34

NEW QUESTION # 132
......
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