Exam GICSP Topic 1 Question 54 Discussion

Actual exam question for GIAC's GICSP exam
Question #: 54
Topic #: 1
Which type of server would be deployed to provide stratum level 2 clock synchronization for ICS systems?

Suggested Answer: B Vote an answer

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

by Lawrence at Jan 13, 2026, 12:15 AM

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