- Exam Code: GNFA
- Exam Name: GIAC Network Forensic Analyst (GNFA)
- Updated: Oct 05, 2026
- Q & A: 97 Questions and Answers
GIAC GNFA Exam : GIAC Network Forensic Analyst (GNFA)
PDF Version DemoAbout GIAC GNFA Exam
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GIAC GNFA Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Encryption and Encoding Techniques | - Encryption algorithms, usage, and implementation - Attacks against encryption and encoding controls - Common encoding methods and data obfuscation |
| Security Event and Incident Logging | - Correlating logs to reconstruct events and activity - Deployment, aggregation, and retention strategies - Log formats, standards, and protocol details |
| Network Analysis Tools and Usage | - Command-line and GUI-based forensic utilities - Practical application in investigation and analysis - Traffic capture and analysis tools (tcpdump, Wireshark, etc.) |
| Network Architecture and Design | - Design considerations for forensics and evidence collection - Network topologies, transmission technologies, and collection points - Segmentation, filtering, and security architecture principles |
| Wireless Network Analysis | - Threats, attacks, and forensic investigation methods - Capture, analysis, and interpretation of wireless traffic - Wireless protocols, operation, and security risks |
| Network Protocol Reverse Engineering | - Tools and methodologies for analyzing unknown or proprietary protocols - Identifying malicious or non-standard communications - Extracting structure, behavior, and data from traffic |
| Common Network Protocols | - Security risks, vulnerabilities, and mitigation controls - Protocol behavior, characteristics, and normal operation - TCP, UDP, IP, HTTP, DNS, SMTP, FTP, and other core protocols |
| 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 |
| Open-Source Network Security Proxies | - Benefits, limitations, and security weaknesses - Log formats, data flow, and forensic value - Architecture, deployment, and operational characteristics |
GIAC Network Forensic Analyst (GNFA) Sample Questions:
Question #1
You are analyzing network traffic and find a series of communications using an unknown protocol. The traffic appears structured, but there is no official documentation available. What should be your first step?
Response:
- A. Attempt brute-force decryption
- B. Capture and inspect the packets using Wireshark
- C. Block all traffic using the protocol immediately
- D. Search for open-source documentation
Correct Answer: B 🗳️
Question #2
Which tools can be used to capture and analyze wireless network traffic?
(Select two.)
Response:
- A. Kismet
- B. Aircrack-ng
- C. Nmap
- D. Netcat
Correct Answer: A,B 🗳️
Question #3
What is the primary purpose of cryptographic salt in password hashing?
Response:
- A. To add randomness to password hashes, preventing precomputed attacks
- B. To encrypt passwords using asymmetric encryption
- C. To shorten the length of the hash for storage efficiency
- D. To replace the original password with a hash value
Correct Answer: A 🗳️
Question #4
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. Man-in-the-Middle attack
- C. DNS Exfiltration
- D. DDoS attack
Correct Answer: C 🗳️
Question #5
Which security mechanisms are commonly implemented in proxy servers?
(Select two.)
Response:
- A. Network address translation (NAT)
- B. Data loss prevention (DLP)
- C. SSL/TLS decryption
- D. Port mirroring
Correct Answer: B,C 🗳️
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