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GIAC GNFA : GIAC Network Forensic Analyst (GNFA)

GNFA

Exam Code: GNFA

Exam Name: GIAC Network Forensic Analyst (GNFA)

Updated: Oct 20, 2026

Q & A: 97 Questions and Answers

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GIAC GNFA Exam Syllabus Topics:

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

                                                  GIAC Network Forensic Analyst (GNFA) Sample Questions:

                                                  Question #1
                                                  Which protocol is commonly used for transmitting log data between devices and centralized logging servers?
                                                  Response:

                                                  A. FTP
                                                  B. HTTP
                                                  C. POP3
                                                  D. Syslog


                                                  Question #2
                                                  Which of the following network protocols is commonly used for email transmission over the internet?
                                                  Response:

                                                  A. FTP
                                                  B. HTTP
                                                  C. SMTP
                                                  D. SNMP


                                                  Question #3
                                                  What is the main advantage of a segmented network architecture?
                                                  Response:

                                                  A. Reduced performance due to additional firewalls
                                                  B. Improved security by limiting lateral movement
                                                  C. Elimination of network monitoring needs
                                                  D. Increased complexity in routing


                                                  Question #4
                                                  Which of the following are benefits of a software-defined network (SDN)?
                                                  (Select two.)
                                                  Response:

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


                                                  Question #5
                                                  Which of the following encryption algorithms are considered secure for modern cryptographic use?
                                                  (Select two.)
                                                  Response:

                                                  A. RC4
                                                  B. AES-256
                                                  C. DES
                                                  D. Blowfish


                                                  Solutions:

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

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