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| Section | Objectives |
|---|---|
| Topic 1: Risk and Security Management | - Risk assessment principles - Security lifecycle management in industrial systems |
| Topic 2: Industrial Network and System Security | - Asset identification and protection - Network segmentation and architecture security |
| Topic 3: ISA/IEC 62443 Framework Overview | - Structure and purpose of IEC 62443 standards - Key terminology and concepts (zones, conduits, security levels) |
| Topic 4: Introduction to Industrial Cybersecurity | - Overview of IT vs OT security concepts - Fundamentals of cybersecurity in industrial environments |
| Topic 5: Policies, Procedures, and Governance | - Security policies for industrial control systems - Compliance and governance considerations |
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NEW QUESTION # 152
What does a demilitarized zone (DMZ) provide in network security?
Answer: C
Explanation:
A demilitarized zone (DMZ) in network architecture provides indirect (controlled and monitored) access to the Internet or untrusted networks, usually by isolating publicly accessible services (like web servers) from internal control networks. This prevents direct exposure of sensitive IACS assets to external threats. While DMZs can support secure data transfer, their primary function is segmentation and indirect access.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3; ISA/IEC 62443-1-1:2007, Section 3.2.6 (Network Security Architectures and DMZ).
NEW QUESTION # 153
Which of the following can be employed as a barrier device in a segmented network?
Available Choices (select all choices that are correct)
Answer: C
Explanation:
A router and a VPN can be employed as barrier devices in a segmented network. A barrier device is a device that controls the flow of traffic between different network segments, based on predefined rules and policies1. A router is a device that forwards packets between different networks, based on their IP addresses2. A router can act as a barrier device by applying access control lists (ACLs) or firewall rules to filter or block unwanted or malicious traffic2. A VPN is a technology that creates a secure and encrypted tunnel between different networks, such as a remote site and a corporate network3. A VPN can act as a barrier device by encrypting the traffic and authenticating the users or devices that access the network3. A VPN can also prevent unauthorized access or eavesdropping by outsiders3.
References: LAYERING NETWORK SECURITY - CISA, Router (computing) - Wikipedia, What Is Network Segmentation? - Cisco.
NEW QUESTION # 154
Which of the following provides the overall conceptual basis in the design of an appropriate security program?
Available Choices (select all choices that are correct)
Answer: C
Explanation:
The reference model provides the overall conceptual basis in the design of an appropriate security program. It defines the common terminology, concepts, and models that can be used by all stakeholders responsible for IACS security. The reference model describes the general characteristics of IACS, the typical threats and vulnerabilities, the security lifecycle phases, and the security levels. The reference model also introduces the concepts of zones and conduits, which are used to group and isolate assets with similar security requirements and to control the communication between them. References https://www.cisco.com/c/en/us/td/docs/solutions
/Verticals/IoT_Security_Lab/IEC62443_WP.pdf
https://www.cisco.com/c/en/us/td/docs/solutions/Verticals/IoT_Security_Lab/IEC62443_WP.pdf
NEW QUESTION # 155
How can defense in depth be achieved via security zones?
Answer: C
Explanation:
ISA/IEC 62443 defines "defense in depth" as a layered approach to security. This can be accomplished by implementing zones within zones (sometimes called subzones), where each zone or subzone provides an additional security barrier or control layer. This segmentation restricts an attacker's ability to move laterally and ensures that compromise of one zone does not automatically result in compromise of the entire system.
Reference: ISA/IEC 62443-1-1:2007, Section 4.3.3 ("Zones and Conduits"); ISA/IEC 62443-3-2:2020, Section 4.4.3 ("Layered security using zones and subzones").
NEW QUESTION # 156
Which factor drives the selection of countermeasures?
Available Choices (select all choices that are correct)
Answer: B
Explanation:
The selection of countermeasures is driven by the output from a risk assessment, which identifies the risks and their associated likelihood and consequences for each zone and conduit in the industrial automation and control system (IACS). The risk assessment also determines the target security level (SL-T) for each zone and conduit, which represents the desired level of protection against the identified threats. The countermeasures are then selected based on the SL-T and the existing security level (SL-A) of the zone and conduit, as well as the cost and feasibility of implementation. The countermeasures should aim to reduce the risk to an acceptable level by increasing the SL-A to meet or exceed the SL-T. References: ISA/IEC 62443-3-2:2018 - Security risk assessment for system design, ISA/IEC 62443-3-3:2013 - System security requirements and security levels, ISA/IEC 62443 Cybersecurity Fundamentals Specialist Training Course
NEW QUESTION # 157
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