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| Section | Objectives |
|---|---|
| Industrial Network and System Security | - Asset identification and protection - Network segmentation and architecture security |
| Policies, Procedures, and Governance | - Compliance and governance considerations - Security policies for industrial control systems |
| ISA/IEC 62443 Framework Overview | - Key terminology and concepts (zones, conduits, security levels) - Structure and purpose of IEC 62443 standards |
| Introduction to Industrial Cybersecurity | - Overview of IT vs OT security concepts - Fundamentals of cybersecurity in industrial environments |
| Risk and Security Management | - Security lifecycle management in industrial systems - Risk assessment principles |
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질문 # 177
Which statement BEST describes the Target Security Protection Ratings?
정답：B
설명：
Target Security Levels (SL-T) or Target Security Protection Ratings are defined as the desired security levels that must be achieved for a specific zone or conduit, based on risk assessment and business requirements.
"The Target Security Level (SL-T) represents the desired level of protection against threats for a zone or conduit, to be fulfilled through appropriate security measures."
- ISA/IEC 62443-3-2:2020, Clause 6.5.2 - Target SL Vector Determination They are not the actual achieved level (SL-A), nor are they a measure of cost-effectiveness. SL-Ts guide system designers and implementers in selecting appropriate security controls.
References:
ISA/IEC 62443-3-2:2020 - Clause 6.5.2
ISA/IEC 62443-1-1 - Security Level Types: SL-T, SL-A, SL-C
질문 # 178
What are the four main categories for documents in the ISA-62443 (IEC 62443) series?
Available Choices (select all choices that are correct)
정답：D
질문 # 179
Which is a role of the application layer?
Available Choices (select all choices that are correct)
정답：A,D
설명：
The application layer is the topmost layer of the OSI model, which provides the interface between the user and the network. It includes protocols specific to network applications such as email, file transfer, and reading data registers in a PLC. These protocols deliver and format information, possibly with encryption and security, to ensure reliable and meaningful communication between different applications. The application layer does not include user applications, which are separate from the network protocols. The application layer also does not provide the mechanism for opening, closing, and managing a session between end-user application processes, which is the function of the session layer. References:
* ISA/IEC 62443 Cybersecurity Fundamentals Specialist Study Guide, page 181
* Using the ISA/IEC 62443 Standards to Secure Your Control System, page 82 The application layer in network protocols, such as in the OSI model or the TCP/IP protocol suite, is primarily responsible for providing services directly to user applications. This layer is involved in:
* Option A: Including protocols specific to network applications such as email, file transfer, and industrial protocols like reading data registers in a Programmable Logic Controller (PLC). This is a core function of the application layer as it facilitates specific high-level networking capabilities.
* Option D: Delivering and formatting information, which can include encryption and ensuring the security of data as it is transmitted across the network. This includes protocols like HTTP for web browsing which can encrypt data via HTTPS, SMTP for secure email transmission, and FTP for secure file transfer.
질문 # 180
Which of the following is NOT a strategy for deploying a WAN?
정답：D
설명：
A Local Area Network (LAN) is not a strategy for deploying a Wide Area Network (WAN). WAN deployment strategies include using the public Internet, private enterprise WANs, or carrier-managed WANs.
LANs, by definition, serve local, not wide-area, connectivity. ISA/IEC 62443 standards refer to different strategies for extending network communications over broader geographic regions, but do not classify LAN as a WAN deployment option.
Reference: ISA/IEC 62443-3-3:2013, Section 4.2.3.4 ("Communications network technologies"); Glossary definitions for LAN and WAN.
질문 # 181
A manufacturing plant is developing a cybersecurity plan for its IACS that must evolve as new threats emerge and system changes occur. Which document should serve as the foundation for this evolving security approach?
정답：A
설명：
The Security Program (SP) portfolio is the correct foundational document for an evolving IACS cybersecurity approach according to the ISA/IEC 62443 family of standards. ISA/IEC 62443 is explicitly designed around the concept of continuous risk management and lifecycle-based cybersecurity, rather than static or one-time security implementations.
Step 1: Role of the Security Program (SP)
ISA/IEC 62443-2-1 defines the requirements for establishing, implementing, maintaining, and continuously improving an IACS Cybersecurity Management System. The Security Program provides organizational governance through policies, roles, responsibilities, procedures, training, incident handling, change management, and continuous improvement activities. These elements ensure cybersecurity adapts as threats, vulnerabilities, and system configurations evolve.
Step 2: Need for an evolving security approach
The standard recognizes that IACS environments are long-lived and subject to changing operational conditions, emerging threat actors, and new vulnerabilities. Therefore, cybersecurity must be managed as an ongoing process. The SP portfolio enables periodic reassessment of risks, updates to controls, and improvements to security processes throughout the system lifecycle.
Step 3: Relationship between SP and SPS
IEC 62443-2-2 introduces the Security Protection Scheme (SPS), which is a documented set of technical, procedural, and physical security measures selected to mitigate identified risks. However, the SPS is not the foundation; it is a product of the Security Program. The SP governs how the SPS is developed, implemented, operated, and modified over time.
Step 4: Elimination of incorrect options
* "IEC 62443-2-2 only" is insufficient because it addresses SPS development without broader governance.
* Corporate KPIs unrelated to IACS do not manage cybersecurity risk.
* An SPS alone cannot evolve without programmatic oversight.
In alignment with the intent and structure of ISA/IEC 62443, the Security Program (SP) portfolio is the correct foundation for a cybersecurity plan that must continuously evolve.
질문 # 182
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