ISA-IEC-62443 ANSWERS FREE | ISA-IEC-62443 NEW GUIDE FILES

ISA-IEC-62443 Answers Free | ISA-IEC-62443 New Guide Files

ISA-IEC-62443 Answers Free | ISA-IEC-62443 New Guide Files

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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q65-Q70):

NEW QUESTION # 65
Which of the following is a recommended default rule for IACS firewalls?
Available Choices (select all choices that are correct)

  • A. Allow all traffic by default.
  • B. Allow IACS devices to access the Internet.
  • C. Block all traffic by default.
  • D. Allow traffic directly from the IACS network to the enterprise network.

Answer: C

Explanation:
A recommended default rule for IACS firewalls is to block all traffic by default, and then allow only the necessary and authorized traffic based on the security policy and the zone and conduit model. This is also known as the principle of least privilege, which means granting the minimum access required for a legitimate purpose. Blocking all traffic by default provides a higher level of security and reduces the attack surface of the IACS network. The other choices are not recommended default rules for IACS firewalls, as they may expose the IACS network to unnecessary risks. Allowing all traffic by default would defeat the purpose of a firewall, as it would not filter any malicious or unwanted traffic. Allowing IACS devices to access the Internet would expose them to potential cyber threats, such as malware, phishing, or denial-of-service attacks. Allowing traffic directly from the IACS network to the enterprise network would bypass the demilitarized zone (DMZ), which is a buffer zone that isolates the IACS network from the enterprise network and hosts services that need to communicate between them. References:
* ISA/IEC 62443 Standards to Secure Your Industrial Control System training course1
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide2
* Using the ISA/IEC 62443 Standard to Secure Your Control Systems3


NEW QUESTION # 66
Which statement is TRUE regarding Intrusion Detection Systems (IDS)?
Available Choices (select all choices that are correct)

  • A. Modern IDS recognize IACS devices by default.
  • B. They require a small amount of care and feeding
  • C. They are very inexpensive to design and deploy.
  • D. They are effective against known vulnerabilities.

Answer: D

Explanation:
Intrusion detection systems (IDS) are tools that monitor network traffic and detect suspicious or malicious activity based on predefined rules or signatures. They are effective against known vulnerabilities, as they can alert the system administrators or security personnel when they encounter a match with a known attack pattern or behavior. However, IDS have some limitations and challenges, especially when applied to industrial automation and control systems (IACS). Some of these are:
* Modern IDS do not recognize IACS devices by default, as they are designed for general-purpose IT networks and protocols. Therefore, they may generate false positives or negatives when dealing with IACS-specific devices, protocols, or traffic patterns. To overcome this, IDS need to be customized or adapted to the IACS environment and context, which may require additional expertise and resources.
* They are not very inexpensive to design and deploy, as they require careful planning, configuration, testing, and maintenance. They also need to be integrated with other security tools and processes, such as firewalls, antivirus, patch management, incident response, etc. Moreover, they may introduce additional costs and risks, such as network performance degradation, data privacy issues, or legal liabilities.
* They are not effective against unknown or zero-day vulnerabilities, as they rely on predefined rules or signatures that may not cover all possible attack scenarios or techniques. Therefore, they may fail to detect novel or sophisticated attacks that exploit new or undiscovered vulnerabilities. To mitigate this, IDS need to be complemented with other security measures, such as anomaly detection, threat intelligence, or machine learning.
* They require a significant amount of care and feeding, as they need to be constantly updated, tuned, and monitored. They also generate a large amount of data and alerts, which may overwhelm the system administrators or security personnel. Therefore, they need to be supported by adequate tools and processes, such as data analysis, alert filtering, prioritization, correlation, or visualization.
References: ISA/IEC 62443-2-1:2010 - Establishing an industrial automation and control system security program, ISA/IEC 62443-3-3:2013 - System security requirements and security levels, ISA/IEC 62443 Cybersecurity Fundamentals Specialist Training Course, [Enhancing Modbus/TCP-Based Industrial Automation and Control Systems Security Using Intrusion Detection Systems]


NEW QUESTION # 67
Authorization (user accounts) must be granted based on which of the following?
Available Choices (select all choices that are correct)

  • A. System complexity
  • B. Specific roles
  • C. Individual preferences
  • D. Common needs for large groups

Answer: B

Explanation:
Authorization is the process of granting or denying access to a network resource or function. Authorization (user accounts) must be granted based on specific roles, which are defined as sets of permissions and responsibilities assigned to a user or a group of users. Roles should be based on the principle of least privilege, which means that users should only have the minimum level of access required to perform their tasks. Roles should also be based on the principle of separation of duties, which means that users should not have conflicting or overlapping responsibilities that could compromise the security or integrity of the system.
Authorization based on individual preferences or common needs for large groups is not recommended, as it could lead to excessive or unnecessary access rights, or to inconsistent or conflicting policies. Authorization based on system complexity is also not a good criterion, as it could result in overcomplicated or unclear roles that are difficult to manage or audit. References:
* ISA/IEC 62443-3-3:2013 - Security for industrial automation and control systems - Part 3-3: System security requirements and security levels1
* ISA/IEC 62443-2-1:2010 - Security for industrial automation and control systems - Part 2-1:
Establishing an industrial automation and control systems security program2
* ISA/IEC 62443-4-1:2018 - Security for industrial automation and control systems - Part 4-1: Product security development life-cycle requirements3


NEW QUESTION # 68
What is defined as the hardware and software components of an IACS?
Available Choices (select all choices that are correct)

  • A. COTS software and hardware
  • B. Electronic security
  • C. Control system
  • D. Cybersecuritv

Answer: C


NEW QUESTION # 69
What is a feature of an asymmetric key?
Available Choices (select all choices that are correct)

  • A. Uses different keys
  • B. Uses a continuous stream
  • C. Has lower network overhead
  • D. Shares the same key OD.

Answer: A


NEW QUESTION # 70
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