- Exam Code: GNFA
- Exam Name: GIAC Network Forensic Analyst (GNFA)
- Certification Provider: GIAC
- Corresponding Certification: Digital Forensics
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Updated: Oct 20, 2026
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GIAC GNFA Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Network Architecture and Design | - Segmentation, filtering, and security architecture principles - Network topologies, transmission technologies, and collection points - Design considerations for forensics and evidence collection |
| Topic 2: Network Protocol Reverse Engineering | - Tools and methodologies for analyzing unknown or proprietary protocols - Extracting structure, behavior, and data from traffic - Identifying malicious or non-standard communications |
| Topic 3: 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 4: Wireless Network Analysis | - Capture, analysis, and interpretation of wireless traffic - Wireless protocols, operation, and security risks - Threats, attacks, and forensic investigation methods |
| Topic 5: Open-Source Network Security Proxies | - Architecture, deployment, and operational characteristics - Benefits, limitations, and security weaknesses - Log formats, data flow, and forensic value |
| Topic 6: Common Network Protocols | - TCP, UDP, IP, HTTP, DNS, SMTP, FTP, and other core protocols - Security risks, vulnerabilities, and mitigation controls - 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: NetFlow Analysis and Attack Visualization | - Using flow data to identify anomalies, attacks, and lateral movement - Visualization and analysis tools and techniques - NetFlow, IPFIX, and flow data formats |
| Topic 9: Encryption and Encoding Techniques | - Attacks against encryption and encoding controls - Common encoding methods and data obfuscation - Encryption algorithms, usage, and implementation |
GIAC Network Forensic Analyst (GNFA) Sample Questions:
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. DDoS attack
- B. Man-in-the-Middle attack
- C. DNS Exfiltration
- D. Ransomware execution
Correct Answer: C 🗳️
Which tool is commonly used for reverse engineering network protocols by capturing and analyzing packet data?
Response:
- A. Nmap
- B. Netcat
- C. Wireshark
- D. Metasploit
Correct Answer: C 🗳️
Which wireless frequency band provides better penetration through walls but lower data speeds?
Response:
- A. 6 GHz
- B. 5 GHz
- C. 2.4 GHz
- D. 60 GHz
Correct Answer: C 🗳️
Which protocol is commonly used for transmitting log data between devices and centralized logging servers?
Response:
- A. FTP
- B. HTTP
- C. POP3
- D. Syslog
Correct Answer: D 🗳️
A security analyst detects an application sending large volumes of encoded traffic to a remote server over an uncommon port. The analyst suspects data exfiltration. What should be done next?
Response:
- A. Terminate all active network sessions
- B. Immediately block the port on the firewall
- C. Investigate the encoding scheme used in the traffic
- D. Assume the traffic is normal and ignore it
Correct Answer: C 🗳️
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