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GIAC Network Forensic Analyst (GNFA) Sample Questions:

1. Which of the following NetFlow-based anomalies could indicate a Distributed Denial-of-Service (DDoS) attack?
(Select two.)
Response:

A) High volume of traffic from a single source
B) High number of unique destination IPs from a single source
C) Unusual encrypted payload patterns
D) Large number of failed login attempts

2. 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) An error in NetFlow collection
C) Normal traffic fluctuation
D) A user downloading a large file

3. What is the primary goal of network protocol reverse engineering?
Response:

A) To analyze and understand undocumented or proprietary protocols
B) To design new network protocols
C) To replace network firewalls with better security
D) To encrypt network traffic for security purposes

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

5. Which of the following is a security risk associated with open Wi-Fi networks?
Response:

A) Multi-factor authentication
B) Encryption key rotation
C) Unauthenticated access
D) VLAN segmentation

Solutions: