ISA-IEC-62443テスト資料 & ISA-IEC-62443復習教材

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist 認定 ISA-IEC-62443 試験問題 (Q87-Q92):

質問 # 87
What do packet filter firewalls examine?
Available Choices (select all choices that are correct)

A. The packet structure and sequence
B. Every incoming packet up to the application layer
C. Only the source, destination, and ports in the header of each packet
D. The relationships between packets in a session

正解：C

解説：
Packet filter firewalls, as defined by ISA/IEC 62443 standards on cybersecurity, primarily examine the source, destination, and ports in the header of each packet. This type of firewall does not inspect the packet content deeply (such as its structure or sequence) or maintain awareness of the relationships between packets in a session. Instead, it operates at a more superficial level, filtering packets based solely on IP addresses and TCP/UDP ports. This approach allows packet filter firewalls to quickly process and either accept or block packets based on these predefined criteria without delving into the complexities of session management or the content of the packets up to the application layer.

質問 # 88
Which is the BEST practice when establishing security zones?
Available Choices (select all choices that are correct)

A. Security zones should contain assets that share common security requirements.
B. Security zones should align with physical network segments.
C. Assets within the same logical communication network should be in the same security zone.
D. All components in a large or complex system should be in the same security zone.

正解：A

解説：
Security zones are logical groupings of assets that share common security requirements based on factors such as criticality, consequence, vulnerability, and threat. Security zones are used to apply the principle of defense in depth, which means creating multiple layers of protection to prevent or mitigate cyberattacks. By creating security zones, asset owners can isolate the most critical or sensitive assets from the less critical or sensitive ones, and apply different levels of security controls to each zone according to the risk assessment. Security zones are not necessarily aligned with physical network segments, as assets within the same network may have different security requirements. For example, a network segment may contain both a safety instrumented system (SIS) and a human-machine interface (HMI), but the SIS has a higher security requirement than the HMI. Therefore, the SIS and the HMI should be in different security zones, even if they are in the same network segment. Similarly, assets within the same logical communication network may not have the same security requirements, and therefore should not be in the same security zone. For example, a logical communication network may span across multiple physical locations, such as a plant and a corporate office, but the assets in the plant may have higher security requirements than the assets in the office. Therefore, the assets in the plant and the office should be in different security zones, even if they are in the same logical communication network. Finally, all components in a large or complex system should not be in the same security zone, as this would create a single point of failure and expose the entire system to potential cyberattacks. Instead, the components should be divided into smaller and simpler security zones, based on their security requirements, and the communication between the zones should be controlled by conduits.
Conduits are logical or physical connections between security zones that allow data flow and access control.
Conduits should be designed to minimize the attack surface and the potential impact of cyberattacks, by applying security controls such as firewalls, encryption, authentication, and authorization. References:
* How to Define Zones and Conduits1
* Securing industrial networks: What is ISA/IEC 62443?2
* ISA/IEC 62443 Series of Standards3

質問 # 89
What does the abbreviation CSMS round in ISA 62443-2-1 represent?
Available Choices (select all choices that are correct)

A. Cyber Security Monitoring System
B. Control System Management System
C. Control System Monitoring System
D. Cyber Security Management System

正解：D

解説：
The abbreviation CSMS stands for Cyber Security Management System in ISA 62443-2-1. This standard defines the elements necessary to establish a CSMS for industrial automation and control systems (IACS) and provides guidance on how to develop those elements123. A CSMS is a collection of policies, procedures, practices, and personnel that are responsible for ensuring the security of IACS throughout their lifecycle24. References: 1: ISA/IEC 62443 Series of Standards - ISA 2: ISA 62443-2-1 - Security for industrial automation and control systems, Part 2-1: Establishing an Industrial Automation and Control Systems Security Program | GlobalSpec 3: IEC 62443-2-1:2010 | IEC Webstore | cyber security, smart city 4: Structuring the ISA/IEC 62443 Standards - ISAGCA

質問 # 90
What are the four main categories for documents in the ISA-62443 (IEC 62443) series?
Available Choices (select all choices that are correct)

A. Assessment. Mitigation. Documentation, and Maintenance
B. People. Processes. Technology, and Training
C. End-User, Integrator, Vendor, and Regulator
D. General. Policies and Procedures. System, and Component

正解：D

質問 # 91
Using the risk matrix below, what is the risk of a medium likelihood event with high consequence?

A. Option A
B. Option B
C. Option C
D. Option D

正解：B

解説：
According to the ISA/IEC 62443 Cybersecurity Fundamentals, the risk matrix is a tool used to assess the risk of a particular event. The risk matrix is divided into three categories: likelihood, consequence, and risk. The likelihood is the probability that an event will occur, the consequence is the impact that the event will have, and the risk is the combination of the two. In this case, the risk of a medium likelihood event with high consequence is a high risk, as shown by the red cell in the matrix. References:
* ISA/IEC 62443 Cybersecurity Fundamentals
* [ISA/IEC 62443 Cybersecurity Certificate Program]
* [Cybersecurity Library]
* [Using the ISA/IEC 62443 Standard to Secure Your Control Systems]

質問 # 92
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