GIAC Network Forensic Analyst (GNFA) : GNFA

  • Exam Code: GNFA
  • Exam Name: GIAC Network Forensic Analyst (GNFA)
  • Updated: Sep 18, 2026
  • Q & A: 97 Questions and Answers

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GIAC GNFA Exam Syllabus Topics:

SectionObjectives
Topic 1: Wireless Network Analysis- Wireless protocols, operation, and security risks
- Capture, analysis, and interpretation of wireless traffic
- Threats, attacks, and forensic investigation methods
Topic 2: Network Analysis Tools and Usage- Command-line and GUI-based forensic utilities
- Traffic capture and analysis tools (tcpdump, Wireshark, etc.)
- Practical application in investigation and analysis
Topic 3: Encryption and Encoding Techniques- Attacks against encryption and encoding controls
- Common encoding methods and data obfuscation
- Encryption algorithms, usage, and implementation
Topic 4: NetFlow Analysis and Attack Visualization- NetFlow, IPFIX, and flow data formats
- Visualization and analysis tools and techniques
- Using flow data to identify anomalies, attacks, and lateral movement
Topic 5: Network Protocol Reverse Engineering- Extracting structure, behavior, and data from traffic
- Tools and methodologies for analyzing unknown or proprietary protocols
- Identifying malicious or non-standard communications
Topic 6: Common Network Protocols- Security risks, vulnerabilities, and mitigation controls
- TCP, UDP, IP, HTTP, DNS, SMTP, FTP, and other core protocols
- Protocol behavior, characteristics, and normal operation
Topic 7: Security Event and Incident Logging- Log formats, standards, and protocol details
- Deployment, aggregation, and retention strategies
- Correlating logs to reconstruct events and activity
Topic 8: Network Architecture and Design- Network topologies, transmission technologies, and collection points
- Design considerations for forensics and evidence collection
- Segmentation, filtering, and security architecture principles
Topic 9: Open-Source Network Security Proxies- Log formats, data flow, and forensic value
- Architecture, deployment, and operational characteristics
- Benefits, limitations, and security weaknesses

GIAC Network Forensic Analyst (GNFA) Sample Questions:

Question #1

Which protocol is used to translate IP addresses to MAC addresses on a local network?
Response:

  • A. DNS
  • B. ICMP
  • C. DHCP
  • D. ARP
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #2

Which of the following best describes an SIEM (Security Information and Event Management) system?
Response:

  • A. A firewall rule enforcement mechanism
  • B. A tool that blocks malicious network traffic
  • C. A system that collects, normalizes, and analyzes security logs
  • D. A device that encrypts all logs for security purposes
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Question #3

Which field in a NetFlow record can help determine if lateral movement is occurring within a network?
Response:

  • A. Destination IP Address and Source and Destination Port
  • B. Source and Destination Port
  • C. Protocol Type
  • D. Destination IP Address
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

Question #4

What methods are used to identify the structure of an unknown network protocol?
(Select two.)
Response:

  • A. Packet inspection
  • B. Reverse engineering binaries
  • C. Static code analysis
  • D. Watching video tutorials
Reveal Solution  Discussion  0

Correct Answer: A,B  🗳️

Question #5

Which log sources are commonly used for detecting insider threats?
(Select two.)
Response:

  • A. Email logs
  • B. File access logs
  • C. IDS/IPS logs
  • D. DNS logs
Reveal Solution  Discussion  0

Correct Answer: A,B  🗳️

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