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| Section | Objectives |
|---|---|
| Risk and Security Management | - Risk assessment principles - Security lifecycle management in industrial systems |
| ISA/IEC 62443 Framework Overview | - Structure and purpose of IEC 62443 standards - Key terminology and concepts (zones, conduits, security levels) |
| Introduction to Industrial Cybersecurity | - Fundamentals of cybersecurity in industrial environments - Overview of IT vs OT security concepts |
| Industrial Network and System Security | - Network segmentation and architecture security - Asset identification and protection |
| Policies, Procedures, and Governance | - Security policies for industrial control systems - Compliance and governance considerations |
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NEW QUESTION # 124
After receiving an approved patch from the JACS vendor, what is BEST practice for the asset owner to follow?
Answer: D
Explanation:
According to the ISA/IEC 62443 Cybersecurity Fundamentals Specialist resources, patches are software updates that fix bugs, vulnerabilities, or improve performance of a system. Patches are classified into three categories based on their urgency and impact: low, medium, and high. Low priority patches are those that have minimal or no impact on the system functionality or security, and can be applied at the next scheduled maintenance. Medium priority patches are those that have moderate impact on the system functionality or security, and should be applied within a reasonable time frame, such as three months. High priority patches are those that have significant or critical impact on the system functionality or security, and should be applied as soon as possible, preferably at the first unscheduled outage. Applying patches in a timely manner is a best practice for maintaining the security and reliability of an industrial automation and control system (IACS).
References:
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, Section 4.3.2, Patch Management
* ISA/IEC 62443-2-1:2009, Security for industrial automation and control systems - Part 2-1: Establishing an industrial automation and control systems security program, Clause 5.3.2.2, Patch management
* ISA/IEC 62443-3-3:2013, Security for industrial automation and control systems - Part 3-3: System security requirements and security levels, Clause 4.3.3.6.2, Patch management
NEW QUESTION # 125
Which analysis method is MOST frequently used as an input to a security risk assessment?
Available Choices (select all choices that are correct)
Answer: B
NEW QUESTION # 126
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: C
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 # 127
If a system integrator is designing zones and conduits for an IACS network based on risk assessments, which part of the ISA/IEC 62443 standard guides this process?
Answer: A
Explanation:
ISA/IEC 62443-3-2 provides explicit guidance on performing security risk assessments that directly inform system architecture, including the design of zones and conduits.
Step 1: Purpose of Part 3-2
This part defines how to identify threats, vulnerabilities, and consequences, and how to derive Target Security Levels (SL-T).
Step 2: Zones and conduits linkage
The standard requires that zones be defined based on risk and criticality, and conduits be established to control communications between zones. This architectural outcome is a direct result of the 3-2 risk assessment process.
Step 3: Integrator relevance
System integrators use Part 3-2 to translate risk results into concrete network segmentation and security boundaries.
Step 4: Why other parts do not apply
Other parts address governance, metrics, or product development, not architectural risk-driven design.
NEW QUESTION # 128
Why is OPC Classic considered firewall unfriendly?
Available Choices (select all choices that are correct)
Answer: D
Explanation:
OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535. Comprehensive Explanation: OPC Classic is a software interface technology that uses the Distributed Component Object Model (DCOM) protocol to facilitate the transfer of data between different industrial control systems. DCOM is a Microsoft technology that allows applications to communicate across a network. However, DCOM is not designed with security in mind, and it poses several challenges for firewall configuration. One of the main challenges is that DCOM does not use fixed TCP port numbers, but rather negotiates new port numbers within the first open connection. This means that intermediary firewalls can only be used with wide-open rules, leaving a large range of ports open for potential attacks. This makes OPC Classic very "firewall unfriendly" and reduces the security and protection they provide. References:
* Tofino Security OPC Foundation White Paper
* Step 2 (for client or server): Configuring firewall settings - GE
* Secure firewall for OPC Classic - Design World
NEW QUESTION # 129
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