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Updated: Aug 29, 2026

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GIAC GNFA Exam Overview:

Certification Vendor:GIAC (SANS Institute)
Exam Name:GIAC Network Forensic Analyst (GNFA) Certification Exam
Exam Number:GNFA
Exam Format:Open Book (authorized materials), Multiple Choice, Proctored
Certificate Validity Period:4 years
Passing Score:Approximately 70–73%
Exam Price:$949–$979 USD
Real Exam Qty:75–85 questions (approx.)
Exam Duration:120-180
Related Certifications:GIAC Certified Intrusion Analyst (GCIA)
GIAC Certified Forensic Analyst (GCFA)
Available Languages:English
Recommended Training:SANS FOR572: Advanced Network Forensics and Analysis
Exam Registration:GIAC Certification Registration
SANS Institute Certification Information
Sample Questions:GIAC GNFA Sample Questions
Exam Way:Online proctored exam (remote delivery via GIAC/SANS platform)
Pre Condition:No mandatory prerequisites. Strongly recommended: networking fundamentals and security analysis experience; SANS FOR572 training is highly recommended.
Official Syllabus URL:https://www.giac.org/certifications/network-forensic-analyst-gnfa/

GIAC GNFA Exam Syllabus Topics:

SectionObjectives
Incident Response and Reporting- Reporting and documentation
  • 1. Technical reporting structure
    • 2. Executive-level summarization
      - Response workflow
      • 1. Containment and eradication support
        • 2. Network-based investigation integration
          Network Protocol Analysis- Application layer protocols
          • 1. DNS query and response forensics
            • 2. HTTP/HTTPS traffic analysis
              - Transport and session behavior
              • 1. TLS/SSL inspection concepts
                • 2. Session reconstruction techniques
                  Network Intrusion Detection and Analysis- IDS/IPS interpretation
                  • 1. Signature vs anomaly detection
                    • 2. Alert triage and validation
                      - Malicious traffic identification
                      • 1. Command and control detection patterns
                        • 2. Lateral movement indicators
                          Network Forensic Investigation- Evidence handling
                          • 1. Chain of custody considerations
                            • 2. Data integrity validation
                              - Incident reconstruction
                              • 1. Timeline creation from PCAP/logs
                                • 2. Attribution and artifact correlation
                                  Packet Capture and Traffic Analysis- Traffic inspection tools
                                  • 1. Protocol decoding and inspection
                                    • 2. Wireshark analysis workflows
                                      - Packet acquisition techniques
                                      • 1. PCAP collection best practices
                                        • 2. tcpdump usage and filtering
                                          Network Fundamentals for Forensics- TCP/IP protocol suite understanding
                                          • 1. TCP vs UDP behavior analysis
                                            • 2. IP addressing and subnetting
                                              - Network architecture and traffic flow
                                              • 1. Client-server communication patterns
                                                • 2. Network segmentation and visibility

                                                  GIAC Network Forensic Analyst (GNFA) Sample Questions:

                                                  Question 1

                                                  Which of the following are benefits of a software-defined network (SDN)?
                                                  (Select two.)
                                                  Response:

                                                  A. Centralized control of network traffic
                                                  B. Greater flexibility and automation
                                                  C. Increased reliance on physical network devices
                                                  D. Elimination of the need for firewalls


                                                  Question 2

                                                  Which of the following fields are typically included in a NetFlow record?
                                                  (Select two.)
                                                  Response:

                                                  A. Application payload
                                                  B. Encrypted session keys
                                                  C. Source and destination IP addresses
                                                  D. Number of packets exchanged


                                                  Question 3

                                                  What is the primary purpose of a VLAN in network architecture?
                                                  Response:

                                                  A. To increase network speed
                                                  B. To logically segment networks without requiring physical separation
                                                  C. To replace firewalls in enterprise environments
                                                  D. To encrypt network traffic


                                                  Question 4

                                                  A company wants to prevent employees from accessing malicious websites while browsing the internet. Which type of proxy would best meet this requirement?
                                                  Response:

                                                  A. Load balancer
                                                  B. Transparent forward proxy
                                                  C. Reverse proxy
                                                  D. Network intrusion detection system


                                                  Question 5

                                                  Which type of network topology is most resilient against a single point of failure?
                                                  Response:

                                                  A. Ring
                                                  B. Star
                                                  C. Bus
                                                  D. Mesh


                                                  Solutions:

                                                  Question 1
                                                  Answer: A,B
                                                  Question 2
                                                  Answer: C,D
                                                  Question 3
                                                  Answer: B
                                                  Question 4
                                                  Answer: B
                                                  Question 5
                                                  Answer: D

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