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GIAC Network Forensic Analyst (GNFA) Sample Questions:

1. What methods are used to identify the structure of an unknown network protocol?
(Select two.)
Response:

A) Static code analysis
B) Packet inspection
C) Reverse engineering binaries
D) Watching video tutorials

2. A security analyst detects an application sending large volumes of encoded traffic to a remote server over an uncommon port. The analyst suspects data exfiltration. What should be done next?
Response:

A) Assume the traffic is normal and ignore it
B) Investigate the encoding scheme used in the traffic
C) Terminate all active network sessions
D) Immediately block the port on the firewall

3. 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) Man-in-the-Middle attack
B) Ransomware execution
C) DNS Exfiltration
D) DDoS attack

4. Which NetFlow version is most commonly used for advanced traffic analysis in modern networks?
Response:

A) NetFlow v5
B) NetFlow v7
C) NetFlow v9
D) NetFlow v1

5. Which of the following is a common use case for a reverse proxy?
Response:

A) Enhancing security by hiding backend servers
B) Encrypting internal DNS queries
C) Bypassing firewall policies
D) Blocking outbound web requests

Solutions: