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GIAC GNFA Exam Syllabus Topics:

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

                                                  GIAC Network Forensic Analyst (GNFA) Sample Questions:

                                                  A security analyst is reviewing NetFlow data and notices a sudden increase in outbound connections to an unfamiliar IP address. The majority of the connections originate from a single internal workstation. What is the most likely cause?
                                                  Response:

                                                  • A. A botnet infection exfiltrating data
                                                  • B. Normal traffic fluctuation
                                                  • C. An error in NetFlow collection
                                                  • D. A user downloading a large file
                                                  Reveal Solution  Discussion  0

                                                  Correct Answer: A  🗳️

                                                  A company is experiencing a data breach and suspects an insider threat. Which logs would be most useful in identifying the responsible party?
                                                  Response:

                                                  • A. DNS query logs
                                                  • B. File access and authentication logs
                                                  • C. Firewall logs
                                                  • D. Web server logs
                                                  Reveal Solution  Discussion  0

                                                  Correct Answer: B  🗳️

                                                  Which of the following log sources would be most useful for detecting brute-force login attempts?
                                                  Response:

                                                  • A. DNS query logs
                                                  • B. Authentication logs
                                                  • C. Network firewall logs
                                                  • D. Web server access logs
                                                  Reveal Solution  Discussion  0

                                                  Correct Answer: B  🗳️

                                                  What types of security events should organizations prioritize in log analysis?
                                                  (Select two.)
                                                  Response:

                                                  • A. Large data transfers from internal to external networks
                                                  • B. Failed login attempts
                                                  • C. CPU utilization logs
                                                  • D. Routine system reboots
                                                  Reveal Solution  Discussion  0

                                                  Correct Answer: A,B  🗳️

                                                  Which of the following best describes an SIEM (Security Information and Event Management) system?
                                                  Response:

                                                  • A. A system that collects, normalizes, and analyzes security logs
                                                  • B. A firewall rule enforcement mechanism
                                                  • C. A device that encrypts all logs for security purposes
                                                  • D. A tool that blocks malicious network traffic
                                                  Reveal Solution  Discussion  0

                                                  Correct Answer: A  🗳️

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