Exam Name: GIAC Network Forensic Analyst (GNFA)
Certification Provider: GIAC
Corresponding Certification: Digital Forensics
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Updated: Oct 04, 2026
No. of Questions: 97 Questions & Answers
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GIAC GNFA Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Wireless Network Analysis | - Threats, attacks, and forensic investigation methods - Capture, analysis, and interpretation of wireless traffic - Wireless protocols, operation, and security risks |
| Topic 2: Network Protocol Reverse Engineering | - Identifying malicious or non-standard communications - Tools and methodologies for analyzing unknown or proprietary protocols - Extracting structure, behavior, and data from traffic |
| Topic 3: Encryption and Encoding Techniques | - Common encoding methods and data obfuscation - Attacks against encryption and encoding controls - Encryption algorithms, usage, and implementation |
| Topic 4: Common Network Protocols | - Protocol behavior, characteristics, and normal operation - TCP, UDP, IP, HTTP, DNS, SMTP, FTP, and other core protocols - Security risks, vulnerabilities, and mitigation controls |
| Topic 5: Open-Source Network Security Proxies | - Benefits, limitations, and security weaknesses - Architecture, deployment, and operational characteristics - Log formats, data flow, and forensic value |
| Topic 6: NetFlow Analysis and Attack Visualization | - Using flow data to identify anomalies, attacks, and lateral movement - NetFlow, IPFIX, and flow data formats - Visualization and analysis tools and techniques |
| Topic 7: Network Architecture and Design | - Segmentation, filtering, and security architecture principles - Design considerations for forensics and evidence collection - Network topologies, transmission technologies, and collection points |
| Topic 8: Network Analysis Tools and Usage | - Traffic capture and analysis tools (tcpdump, Wireshark, etc.) - Command-line and GUI-based forensic utilities - Practical application in investigation and analysis |
| Topic 9: Security Event and Incident Logging | - Log formats, standards, and protocol details - Correlating logs to reconstruct events and activity - Deployment, aggregation, and retention strategies |
GIAC Network Forensic Analyst (GNFA) Sample Questions:
Which of the following is an indication of a custom or proprietary network protocol?
Response:
- A. Use of open-source encryption libraries
- B. Presence of cleartext credentials in packets
- C. Standard TCP and UDP port usage
- D. Non-standard packet structures and headers
Correct Answer: D 🗳️
An organization suspects that an attacker is using a tunneling technique to evade detection. The analyst checks NetFlow records and sees a high number of outbound DNS queries with unusually large payloads. What type of attack is likely occurring?
Response:
- A. Ransomware execution
- B. DDoS attack
- C. DNS Exfiltration
- D. Man-in-the-Middle attack
Correct Answer: C 🗳️
Your company is implementing a Zero Trust network model. Which approach would best align with Zero Trust principles?
Response:
- A. Using only perimeter-based firewalls
- B. Allowing unrestricted lateral movement within the network
- C. Granting access based on IP address
- D. Requiring continuous authentication and strict access controls
Correct Answer: D 🗳️
What is the primary purpose of security event logging?
Response:
- A. To prevent all cyberattacks before they occur
- B. To replace the need for intrusion detection systems
- C. To store all network activity indefinitely
- D. To detect, investigate, and respond to security incidents
Correct Answer: D 🗳️
Which best practices should organizations follow when configuring log retention policies?
(Select two.)
Response:
- A. Retain logs based on regulatory compliance requirements
- B. Encrypt logs to prevent unauthorized access
- C. Store all logs indefinitely
- D. Delete all logs after 30 days to save storage space
Correct Answer: A,B 🗳️
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