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Title: ISA ISA-IEC-62443 PDF Questions Format [Print This Page]
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Title: ISA ISA-IEC-62443 PDF Questions Format
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ISA/IEC 62443 Cybersecurity Fundamentals Specialist Sample Questions (Q154-Q159):NEW QUESTION # 154
What is the name of the missing layer in the Open Systems Interconnection (OSI) model shown below?

Answer: C
Explanation:
The Open Systems Interconnection (OSI) model is a framework that describes the functions of a networking system. The OSI model categorizes the computing functions of the different network components, outlining the rules and requirement needed to support the interoperability of the software and hardware that make up the network1.
The OSI model consists of seven abstraction layers arranged in a top-down order: Physical, Data Link, Network, Transport, Session, Presentation, and Application. The Transport layer is the fourth layer in the OSI model, and it is responsible for ensuring reliable and efficient data transfer between the Network layer and the Session layer2. The Transport layer uses protocols such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) to provide end-to-end communication services, such as error detection and correction, flow control, congestion control, and segmentation2.
The image that you sent shows a 3D representation of the OSI model, with the layers stacked on top of each other. The missing layer is the Transport layer, which isrepresented by a pink box with a white arrow pointing to it. The arrow is labeled "TCP, UDP".
1: What is the OSI Model? 7 Network Layers Explained | Fortinet 2: What is OSI Model | 7 Layers Explained
- GeeksforGeeks

NEW QUESTION # 155
What is a major reason for maintaining an asset inventory baseline in Configuration Management (SP Element 2)?
Answer: A
Explanation:
In SP Element 2 - Configuration Management, maintaining an accurate asset inventory baseline helps detect deviations from the expected configuration, which is critical for identifying anomalies and potential cyber incidents.
"A baseline asset inventory helps in identifying unauthorized changes or additions, which may indicate a security breach or anomaly."
- ISA/IEC 62443-2-1:2010, Clause 4.3.4 - SP Element 2
Although documentation of architecture is important, the primary security function of the baseline is anomaly detection and change tracking.
References:
ISA/IEC 62443-2-1 - SP Element 2: Configuration and Change Management
ISA/IEC 62443-3-3 - System Integrity Controls

NEW QUESTION # 156
What is the primary audience for Part 2-5 of the ISA/IEC 62443 Series - Policies & Procedures group of standards?
Answer: C
Explanation:
ISA/IEC 62443-2-5 provides requirements and guidance specifically for service providers (such as those delivering IACS-related managed services, maintenance, or cybersecurity services). While system integrators and asset owners use this guidance, its main audience is service providers, ensuring that their procedures align with cybersecurity best practices for IACS.
Reference: ISA/IEC 62443-2-5:2019, Scope and Introduction.

NEW QUESTION # 157
Which of the following is NOT a general class of firewalls?
Answer: B
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 # 158
What is one challenge associated with firewalls?
Answer: B
Explanation:
A significant challenge with firewalls in industrial environments is deciding how they should be configured.
The complexity arises from needing to balance operational requirements (such as process data flow) with security needs (such as blocking unauthorized access). Misconfiguration can lead either to security gaps or to unnecessary operational disruptions. Firewalls can filter many types of traffic (not just HTTP) and while updates are important, configuration is the biggest ongoing challenge.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3.3 (Firewalls and configuration management); ISA/IEC
62443-2-1:2009, Section 6.3.2.

NEW QUESTION # 159
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