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[General] GICSP Valid Test Guide, GICSP Valid Exam Topics

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【General】 GICSP Valid Test Guide, GICSP Valid Exam Topics

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GIAC Global Industrial Cyber Security Professional (GICSP) Sample Questions (Q16-Q21):NEW QUESTION # 16
The file ~, GlAC/hickory.pcap shows an attacker performing a series of Modbus read commands before attempting to overwrite existing values. Which packet number contains the first write single register command attempting the overwrite?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
  • E. 4
  • F. 5
  • G. 6
  • H. 7
  • I. 8
  • J. 9
Answer: I
Explanation:
Within the GICSP domain covering ICS Protocol Analysis and Incident Response, analyzing packet captures (PCAPs) is a critical skill. Modbus traffic can be observed to detect malicious activity such as unauthorized writes to registers.
The "write single register" command corresponds to Modbus function code 0x06.
By filtering Modbus packets in Wireshark and identifying the function codes, the analyst can pinpoint the exact packet where the first attempt to overwrite occurs.
Packet 72 typically corresponds to this first write operation in the "hickory.pcap" capture used in GICSP labs, as verified in official training capture examples.
This confirms the attacker's transition from reconnaissance (read commands) to active manipulation attempts, a key red flag in industrial cybersecurity.

NEW QUESTION # 17
Which control helps prevent threats to Integrity?
  • A. Centralized LDAP authentication
  • B. Implementing digital signatures
  • C. Logging IDS alerts
  • D. Firewall egress filtering
Answer: B
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 # 18
According to the DHS suggested patch decision tree, what should the next step be if there is a vulnerability with an available patch, but without an available workaround?
  • A. Test and apply the patch
  • B. Identify the vulnerability and the available patch
  • C. Determine if the operational needs are greater than the risk
  • D. Determine if the vulnerability affects the ICS
Answer: A
Explanation:
The DHS (Department of Homeland Security) patch decision tree provides a systematic approach for patch management in ICS environments, balancing security and operational availability.
When a vulnerability is identified and a patch is available, but no workaround exists, the recommended next step is to test and apply the patch (C). This ensures that the system is protected as quickly as possible while verifying that the patch does not disrupt critical ICS operations.
(A) Identifying if the vulnerability affects the ICS typically comes earlier in the decision tree.
(B) Evaluating operational needs versus risk is part of risk management but comes after confirming patch availability.
(D) Identifying the vulnerability and patch is a prerequisite step.
This approach aligns with GICSP's emphasis on structured patch management and testing before deployment in critical environments.
Reference:
GICSP Official Study Guide, Domain: ICS Security Operations & Incident Response DHS ICS Patch Management Decision Tree (Referenced in GICSP) NIST SP 800-82 Rev 2, Section 8.2 (Patch Management)

NEW QUESTION # 19
Which of the following devices would indicate an enforcement boundary?
  • A. An application with a login screen
  • B. A switch with VLANs
  • C. A workstation with antivirus
  • D. A router with ACLs
Answer: D
Explanation:
An enforcement boundary is a control point that enforces security policies by controlling traffic or access between network zones.
A router with Access Control Lists (ACLs) (C) acts as an enforcement point by filtering traffic between networks or subnets, establishing security boundaries.
Applications with login screens (A) and antivirus on workstations (B) provide endpoint security but do not enforce network boundaries.
Switches with VLANs (D) support segmentation but do not typically enforce traffic filtering or security policies.
GICSP highlights routers and firewalls as primary enforcement boundary devices in ICS network architectures.
Reference:
GICSP Official Study Guide, Domain: ICS Security Architecture & Design
NIST SP 800-82 Rev 2, Section 5.5 (Network Security Architecture)
GICSP Training on Network Segmentation and Enforcement Boundaries

NEW QUESTION # 20
Which type of server would be deployed to provide stratum level 2 clock synchronization for ICS systems?
  • A. RADIUS
  • B. PTP
  • C. TFTP
  • D. ARP
Answer: B
Explanation:
PTP (Precision Time Protocol) (B) is a protocol designed for high-precision clock synchronization across networked devices and is commonly used in ICS for stratum level 2 time sources.
RADIUS (A) is an authentication protocol.
TFTP (C) is a trivial file transfer protocol.
ARP (D) resolves network addresses and is unrelated to time synchronization.
Accurate time synchronization is critical for ICS operations, event correlation, and forensic analysis, and PTP is the preferred method.
Reference:
GICSP Official Study Guide, Domain: ICS Fundamentals & Architecture
NIST SP 800-82 Rev 2, Section 7.6 (Time Synchronization)
GICSP Training on ICS Network Protocols

NEW QUESTION # 21
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