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ISA ISA-IEC-62443 Sample Question Answers
Question # 1
Which of the following is the underlying protocol for Ethernet/IP? Available Choices (select all choices that are correct)
A. Building Automation and Control Network (BACnet) B. Common Industrial Protocol C. Highway Addressable Remote Transducer (HART) D. Object Linking and Embedding (OLE) for Process Control
Answer: B
Question # 2
A company discovers malware on a portable USB device used within their IACS environment. According to the document, which SP Element and controls would be MOST relevant to address this issue?
A. SP Element 1 — Processes for discovery of security anomalies B. SP Element 2 — Asset inventory baseline C. SP Element 4 — Component hardening and dedicated portable media D. SP Element 7 — Incident handling and response
Answer: C
Question # 3
In a defense-in-depth strategy, what is the purpose of role-based access control? Available Choices (select all choices that are correct)
A. Ensures that users can access systems from remote locations B. Ensures that users can access only certain devices on the network C. Ensures that users can access only the functions they need for their job D. Ensures that users correctly manage their username and password
Answer: C
Question # 4
Which is a commonly used protocol for managing secure data transmission on the Internet?
Available Choices (select all choices that are correct) A. Datagram Transport Layer Security (DTLS) B. Microsoft Point-to-Point Encryption C. Secure Telnet D. Secure Sockets Layer
Answer: A,D
Question # 5
If an industrial control system experiences frequent unexpected shutdowns causing downtime, which SP Element activities should be reviewed to improve system availability?
A. SP Element 1 – Supply chain security B. SP Element 2 – Change control C. SP Element 7 – Logging and event reporting D. SP Element 8 – Backup restoration
Answer: D
Question # 6
How can Modbus be secured?
A. By firewall B. By using a VPN C. By limiting user access D. By encrypting all data packets
Answer: A
Question # 7
Which is the BEST deployment system for malicious code protection? Available Choices (select all choices that are correct)
A. Network segmentation B. IACS protocol converters C. Application whitelistinq (AWL) OD. D. Zones and conduits
Answer: C
Question # 8
Which of the following starts at a high level and includes all ANSI/ISA-95 Level 0,1,2,3,4 equipment and information systems?
A. Zone model B. Asset model C. Reference model D. Reference architecture
Answer: C
Question # 9
Why is OPC Classic considered firewall unfriendly? Available Choices (select all choices that are correct)
A. OPC Classic uses DCOM, which dynamically assigns any port between 1024 and 65535. B. OPC Classic is allowed to use only port 80. C. OPC Classic works with control devices from different manufacturers. D. OPC Classic is an obsolete communication standard.
Answer: A
Question # 10
Which is NOT a potential consequence for organizations that fail to prioritize control system security?
A. Personal injury B. Decreased energy consumption C. Unauthorized access, theft, or misuse of data D. Violation of legal and regulatory requirements
Answer: B
Question # 11
Whose responsibility is it to determine the level of risk an organization is willing to tolerate? Available Choices (select all choices that are correct)
A. Management B. Legal Department C. Operations Department D. Safety Department
Answer: A
Question # 12
Which is a role of the application layer? Available Choices (select all choices that are correct)
A. Includes protocols specific to network applications such as email, file transfer, and reading data registers in a PLC B. Includes user applications specific to network applications such as email, file transfer, and reading data registers in a PLC C. Provides the mechanism for opening, closing, and managing a session between enduser application processes D. Delivers and formats information, possibly with encryption and security
Answer: A,D
Question # 13
After receiving an approved patch from the JACS vendor, what is BEST practice for the asset owner to follow?
A. If a low priority, there is no need to apply the patch. B. If a medium priority, schedule the installation within three months after receipt. C. If a high priority, apply the patch at the first unscheduled outage. D. If no problems are experienced with the current IACS, it is not necessary to apply the patch.
Answer: C
Question # 14
If a U.S. federal agency must comply with mandatory cybersecurity requirements under law, which document would they be required to follow?
A. NIST FIPS B. ISA/IEC 62443 C. EU Cyber Resilience Act D. NIST Special Publication 800-171
Answer: A
Question # 15
What is a major reason for maintaining an asset inventory baseline in Configuration Management (SP Element 2)?
A. To document IACS architecture B. To ensure physical access control C. To enforce user authentication policies D. To detect security anomalies in event management
Answer: D
Question # 16
Which steps are included in the ISA/IEC 62443 assess phase? Available Choices (select all choices that are correct)
A. Cybersecurity requirements specification and detailed cyber risk assessment B. Cybersecurity requirements specification and allocation of IACS assets to zones and conduits C. Detailed cyber risk assessment and cybersecurity maintenance, monitoring, and management of change D. Allocation of IACS assets to zones and conduits, and detailed cyber risk assessment
Answer: B
Question # 17
What is an important difference between IT systems and IACS? Available Choices (select all choices that are correct)
A. The IACS security priority is integrity. B. The IT security priority is availability. C. IACS cybersecurity must address safety issues. D. Routers are not used in IACS networks.
Answer: A,C
Question # 18
Which of the following staff is NOT mentioned as a stakeholder in the CSMS Program?
A. Marketing B. Operations C. IT security D. Physical security
Answer: A
Question # 19
What is a key aspect of the relationship between physical security measures and cybersecurity?
A. Cybersecurity is irrelevant. B. Physical security is more important. C. They should operate independently. D. They should complement each other.
Answer: D
Question # 20
Which is the BEST practice when establishing security zones? Available Choices (select all choices that are correct)
A. Security zones should contain assets that share common security requirements. B. Security zones should align with physical network segments. C. Assets within the same logical communication network should be in the same security zone. D. All components in a large or complex system should be in the same security zone.
Answer: A
Question # 21
What is the primary focus of Part 3-2 in the ISA/IEC 62443 series?
A. Security technologies for IACS B. Cybersecurity risk assessment and system design C. Secure product development lifecycle requirements D. Technical security requirements for IACS components
Answer: B
Question # 22
What type of malware disrupted an emergency shutdown capability in safety systems?
A. Zeus B. Stuxnet C. WannaCry D. Triton or Trisis
Answer: D
Question # 23
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)
A. ATCP/UDP application ID B. A TCP/UDP host ID C. ATCP/UDP port number D. ATCP/UDP registry number
Answer: C
Question # 24
What is the PRIMARY goal of the IACS Security Program (SP) requirements according to ISA/IEC 62443-2-1?
A. To mitigate risk B. To implement technologies only C. To focus solely on physical security measures D. To eliminate all cybersecurity risks completely
Answer: A
Question # 25
What is a key feature of the NIS2 Directive?
A. It mandates compliance with all standards. B. It focuses solely on physical security regulations. C. It establishes a cyber crisis management structure. D. It eliminates the need for public-private partnerships.
Answer: C
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