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GIAC Network Forensic Analyst (GNFA) Sample Questions:

1. Which actions can be taken after detecting malicious activity using NetFlow?
(Select two.)
Response:

A) Modify encryption keys dynamically
B) Block malicious IP addresses at the firewall
C) Decrypt all traffic for deeper analysis
D) Capture full packet data for forensic analysis

2. What is the primary purpose of log normalization in security event logging?
Response:

A) To store raw logs in different formats
B) To convert log entries into a consistent format for analysis
C) To encrypt all log data before analysis
D) To delete unnecessary logs for storage optimization

3. 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) Firewall logs
B) DNS query logs
C) File access and authentication logs
D) Web server logs

4. A security analyst observes multiple failed login attempts from the same IP address within a short time. What is the most appropriate action to take?
Response:

A) Investigate the source IP and check for additional related logs
B) Ignore the event unless a successful login occurs
C) Delete the logs to free up storage space
D) Block the IP address immediately

5. 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) DNS Exfiltration
C) DDoS attack
D) Man-in-the-Middle attack

Solutions: