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| Section | Weight | Objectives |
|---|---|---|
| Industrial Network Security | 30% | - Threats, vulnerabilities and risk assessment - Network segmentation and security architecture - Industrial protocols security |
| Security Fundamentals & ISA/IEC 62443 Framework | 20% | - Foundational security requirements - Structure and parts of ISA/IEC 62443 standards - Core security principles: CIA triad, defense-in-depth - Zones and conduits model |
| Access Control & Identity Management | 15% | - Role-based access control - Security policies and procedures - User authentication and authorization |
| Industrial Automation and Control Systems (IACS) Overview | 15% | - Cybersecurity importance in industrial environments - IACS components, architectures and protocols - Differences between IT and OT security |
| Security Operations & Incident Response | 20% | - Incident handling and response processes - Cybersecurity Management System (CSMS) - Monitoring, maintenance and continuous improvement |
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NEW QUESTION # 132
Which policies and procedures publication is titled Patch Manaqement in the IACS Environment?
Available Choices (select all choices that are correct)
Answer: C
NEW QUESTION # 133
Who must be included in a training and security awareness program?
Available Choices (select all choices that are correct)
Answer: A
Explanation:
Modbus over Ethernet, also known as Modbus/TCP, is a protocol that encapsulates the Modbus/RTU data string inside the data section of the TCP frame. It then sets up a client/server exchange between nodes, using TCP/IP addressing to establish connections1. This makes it easy to manage in a firewall, because the firewall can filter the traffic based on the source and destination IP addresses and the TCP port number. The default TCP port for Modbus/TCP is 502, but it can be changed if needed. Modbus/TCP does not use any other ports or protocols, so the firewall rules can be simple and specific. References:
* 8: Open Modbus/TCP Specification, RTA Automation, 2010.
* [9]: Modbus Application Protocol Specification V1.1b3, Modbus Organization, 2012.
NEW QUESTION # 134
Whose responsibility is it to determine the level of risk an organization is willing to tolerate?
Available Choices (select all choices that are correct)
Answer: D
NEW QUESTION # 135
At Layer 4 of the Open Systems Interconnection (OSI) model, what identifies the application that will handle a packet inside a host?
Available Choices (select all choices that are correct)
Answer: D
Explanation:
At layer 4 of the OSI model, also known as the transport layer, the application that will handle a packet inside a host is identified by a TCP/UDP port number. A port number is a 16-bit integer that is assigned to a specific application or service that runs on a host. Port numbers are used to multiplex and demultiplex the data streams that are exchanged between hosts and end systems. Multiplexing is the process of combining multiple data streams into one, while demultiplexing is the process of separating one data stream into multiple ones. Port numbers are part of the header of the transport layer protocol data unit (PDU), which is called a segment for TCP and a datagram for UDP. The header contains the source port number and the destination port number, which indicate the applications that are involved in the communication. For example, if a host sends a packet to another host using the HTTP protocol, which runs on port 80 by default, the source port number would be a random number chosen by the sender, and the destination port number would be 80. The receiver would then use the destination port number to demultiplex the packet and deliver it to the HTTP application.
Port numbers are divided into three ranges: well-known ports (0-1023), registered ports (1024-49151), and dynamic or private ports (49152-65535). Well-known ports are reserved for common and standardized applications and services, such as HTTP (80), FTP (21), and SSH (22). Registered ports are assigned by the Internet Assigned Numbers Authority (IANA) to specific applications and services that request them, such as Skype (49175) and Minecraft (25565). Dynamic or private ports are not assigned by any authority and can be used by any application or service that needs them, such as ephemeral ports that are used for temporary connections.
The other options are not valid identifiers for the application that will handle a packet inside a host at layer 4 of the OSI model. A TCP/UDP application ID is not a term that is used in the OSI model or the TCP/IP model. A TCP/UDP host ID is not a term that is used in the OSI model or the TCP/IP model, and it would be more appropriate for layer 3, which is the network layer, where the host is identified by an IP address. A TCP
/UDP registry number is not a term that is used in the OSI model or the TCP/IP model, and it would be more appropriate for layer 5, which is the session layer, where the registry number is used to identify a session between two hosts.
References:
Transport Layer | Layer 4 | The OSI-Model1
OSI model - Wikipedia2
What is Layer 4 of the OSI Model? | Glossary | A10 Networks3
What Are the 7 Layers of the OSI Model? | Webopedia4
NEW QUESTION # 136
A plant has several zones including business, safety-critical, and wireless zones. According to ISA/IEC
62443, how should these zones be managed during risk assessment?
Answer: D
Explanation:
The zone and conduit model, core to IEC 62443-3-2, emphasizes the importance of separating zones based on their risk profile and criticality.
From IEC 62443-3-2, Clause 4.5.2:
"Zones should be established to group assets with similar security requirements. The separation of zones ensures that assets with differing risk levels are appropriately isolated to reduce the attack surface and limit propagation of potential threats." Furthermore, Clause 4.5.5 states:
"The use of conduits between zones should be carefully evaluated and controlled, with security functions tailored to the sensitivity of the zones involved." Incorrect Options:
A). Combine all zones - Violates the principle of segmentation and defense-in-depth.
B). Ignore physical location - Physical and logical segmentation is key in risk assessment.
D). Treat temporary devices as permanent - Inconsistent with the dynamic risk-based approach outlined in
62443-3-2.
References:
ISA/IEC 62443-3-2:2020 - "Security risk assessment and system design"
ISA/IEC 62443-1-1:2007 - "Terminology, Concepts, and Models"
ISA/IEC 62443 Study Guide
NEW QUESTION # 137
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