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GIAC Global Industrial Cyber Security Professional (GICSP) Sample Questions (Q76-Q81):
NEW QUESTION # 76
Which control helps prevent threats to Integrity?
Answer: D
Explanation:
Integrity in cybersecurity ensures that data and systems are not altered or tampered with in an unauthorized manner. To protect integrity, controls must verify that data originates from a trusted source and has not been changed.
Digital signatures (D) provide cryptographic proof of data origin and integrity by enabling recipients to verify that the data has not been altered since it was signed.
Firewall egress filtering (A) limits outbound traffic but primarily protects confidentiality and availability, not directly integrity.
Logging IDS alerts (B) supports detection and auditing but is reactive rather than preventive.
Centralized LDAP authentication (C) manages user authentication and access control, mainly protecting confidentiality and accountability.
GICSP highlights digital signatures as a core control to maintain data integrity, especially for firmware, configuration files, and critical commands within ICS.
Reference:
GICSP Official Study Guide, Domain: ICS Security Principles
NIST SP 800-82 Rev 2, Section 6.5 (Information Integrity Controls)
GICSP Training on Cryptographic Controls and Data Integrity
NEW QUESTION # 77
In the context of ICS the process of fuzzing a device is described as which of the following?
Answer: A
Explanation:
Fuzzing (C) is a security testing technique that involves sending invalid, unexpected, or random inputs to a device or application to discover vulnerabilities like buffer overflows or crashes.
Brute force attacks (A) target authentication, not input validation.
Launching known exploits (B) is penetration testing but not fuzzing.
(D) and (E) describe environmental or stress testing.
GICSP highlights fuzzing as a proactive testing method to uncover ICS device vulnerabilities.
Reference:
GICSP Official Study Guide, Domain: ICS Security Operations & Incident Response OWASP Fuzzing Resources GICSP Training on Vulnerability Assessment Techniques
NEW QUESTION # 78
A brewer uses a local HMI to communicate with a controller that opens a pump to move the workfrom the boil kettle to the fermentor. What level of the Purdue model would the controller be considered?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The Purdue Enterprise Reference Architecture (PERA) model, commonly used in ICS security frameworks like GICSP, segments industrial control systems into hierarchical levels that correspond to the function and control of devices:
Level 0: Physical process (sensors and actuators directly interacting with the process) Level 1: Basic control level (controllers such as PLCs or DCS controllers that execute control logic and command actuators) Level 2: Supervisory control (HMIs, SCADA supervisory systems that interface with controllers) Level 3: Operations management (Manufacturing Execution Systems, batch control, production scheduling) Level 4: Enterprise level (business systems, ERP, corporate IT) In this scenario, the controller opening the pump is a device executing control logic directly on the process, placing it at Level 1. The local HMI used to communicate with the controller is at Level 2, supervising and providing operator interface.
This classification is foundational in GICSP's ICS Fundamentals and Architecture domain, which emphasizes clear understanding of network segmentation and device role for security zoning.
Reference:
GICSP Official Study Guide, Domain: ICS Fundamentals & Architecture
Purdue Model description in IEC 62443 and NIST SP 800-82
GICSP Training materials on Purdue Model and Network Segmentation
NEW QUESTION # 79
During a plant upgrade an architect needs to connect legacy lEDs to a new TCP/IP instrumentation LAN. The lEDs only have RS-232 communication interfaces available. What would best be used to connect the lEDs?
Answer: B
Explanation:
Legacy devices using RS-232 interfaces require a communications gateway (C) to translate between the serial communication protocol and the new TCP/IP network.
A data diode (A) is a unidirectional security device, not a protocol translator.
An engineering workstation (B) is a computer, not a protocol conversion device.
An industrial switch (D) operates at the Ethernet layer and does not perform protocol conversion.
GICSP emphasizes gateways as essential for integrating legacy ICS devices into modern IP networks while maintaining protocol integrity.
Reference:
GICSP Official Study Guide, Domain: ICS Fundamentals & Architecture
NIST SP 800-82 Rev 2, Section 3.4 (Legacy Protocol Integration)
GICSP Training on ICS Network Architecture and Protocols
NEW QUESTION # 80
What can be configured on the router so that it can most effectively implement and enforce zones for the shown subnets?
Answer: C
Explanation:
The diagram shows multiple subnets/zones (Levels 0-3) connected via routers and switches. To enforce traffic flow policies between these zones/subnets, the router should implement Access Control Lists (ACLs) (B).
ACLs can:
Filter traffic between subnets based on IP addresses, ports, and protocols Enforce security boundaries as per ICS segmentation principles (A) MAC-based port security controls device-level access but is less effective for inter-subnet traffic control.
(C) Secure Shell (SSH) is for secure device management, not traffic control.
(D) 802.1x provides port-based network access control but is less relevant for routing traffic between subnets.
GICSP highlights ACLs as fundamental tools for network segmentation enforcement in ICS.
Reference:
GICSP Official Study Guide, Domain: ICS Security Architecture & Design
NIST SP 800-82 Rev 2, Section 5.5 (Network Segmentation and Filtering)
GICSP Training on Network Security Controls
NEW QUESTION # 81
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