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| Section | Objectives |
|---|---|
| Addressing Risk with Selected Security Counter Measures | - Patch management - Firewalls and network security devices - Anti-virus and endpoint protection - Virtual Private Networks (VPNs) |
| Creating A Security Program | - Developing a long-term security program - Security management organization - Defining information security policy |
| Understanding the Current Industrial Security Environment | - Convergence of IT and OT - Current state of industrial control systems security - Security challenges in OT environments |
| Validating or Verifying the Security of Systems | - Continuous improvement of security measures - Security validation and verification techniques - Auditing and compliance |
| Addressing Risk with Security Policy, Organization, and Awareness | - Organizational security roles and responsibilities - Security awareness and training - Security policies and procedures |
| Monitoring and Improving the CSMS | - Security lifecycle management - Continuous monitoring of IACS cybersecurity - Incident detection and response |
| How Cyberattacks Happen | - Vulnerabilities in industrial systems - Cyber threats and attack vectors - Case studies of industrial cyber incidents |
| Risk Analysis | - Risk and vulnerability analysis techniques - Cybersecurity risk assessment concepts - Risk management fundamentals |
| Addressing Risk with Implementation Measures | - Industrial network architecture and segmentation - Defense-in-depth strategy - Zones and conduits model - Access control principles |
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NEW QUESTION # 217
Which of the following is NOT a general class of firewalls?
Answer: A
Explanation:
Packet filter, application proxy, and stateful inspection are all recognized types or classes of firewalls in both IT and industrial control environments. A network monitor, on the other hand, is not considered a firewall but rather a tool for observing and analyzing network traffic. It does not provide firewall-like controls for blocking or allowing traffic.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3.3 ("Types of firewalls"); ISA/IEC 62443-1-1:2007, Section 3.2.6.
NEW QUESTION # 218
Which of the following is a recommended default rule for IACS firewalls?
Available Choices (select all choices that are correct)
Answer: D
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 # 219
Which of the following BEST describes 'Vulnerability'?
Answer: D
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 # 220
How can defense in depth be achieved via security zones?
Answer: B
Explanation:
Defense in depth is a core concept of ISA/IEC 62443, and security zones are a structural method to implement it. According to ISA/IEC 62443-3-2 and 62443-1-1, layering can be achieved by nesting zones - creating zones within zones (i.e., subzones) - to enhance protection through multiple barriers.
"Defense in depth is realized through segmentation into zones and conduits. A zone may contain subzones to establish additional layers of security, providing multiple barriers to intrusion."
- ISA/IEC 62443-3-2:2020, Clause 5.3.2 - Zone and Conduit Model
This layered zoning approach enables tiered security controls, reducing the impact of breaches and limiting lateral movement within a network.
References:
ISA/IEC 62443-3-2:2020 - Clause 5.3.2
ISA/IEC 62443-1-1:2007 - Security Zones and Conduits
NEW QUESTION # 221
What is the definition of "defense in depth" when referring to cybersecurity?
Answer: D
Explanation:
"Defense in Depth" is a foundational principle in ISA/IEC 62443, defined as:
"The application of multiple security countermeasures in a layered (stepwise) fashion to protect assets." (ISA/IEC 62443-1-1, Clause 3.2.65) The objective is to reduce the probability that a single point of failure or vulnerability can be exploited to compromise the system. Layers may include physical security, network segmentation, authentication, intrusion detection, and endpoint protection.
From ISA/IEC 62443-3-3:
"Defense in depth should be employed to provide redundancy in security mechanisms. Each layer increases the security of the system and mitigates different types of threats." Incorrect Options:
A and B - Misinterpret the concept as technical complexity, rather than layered protection.
C - Refers to physical spacing, not a cybersecurity strategy.
References:
ISA/IEC 62443-1-1:2007 - "Terminology, Concepts, and Models"
ISA/IEC 62443-3-3:2013 - "System Security Requirements and Security Levels" ISA/IEC 62443 Study Guide
NEW QUESTION # 222
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