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GIAC Network Forensic Analyst (GNFA) Sample Questions:

1. What is the primary purpose of a VLAN in network architecture?
Response:

A) To increase network speed
B) To logically segment networks without requiring physical separation
C) To replace firewalls in enterprise environments
D) To encrypt network traffic

2. What is a key advantage of using a proxy-based firewall compared to a packet-filtering firewall?
Response:

A) Packet-filtering firewalls work at the application layer
B) Proxy-based firewalls inspect entire application-layer data
C) Proxy-based firewalls cannot block specific content types
D) Packet-filtering firewalls are more secure

3. 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 user downloading a large file
B) Normal traffic fluctuation
C) An error in NetFlow collection
D) A botnet infection exfiltrating data

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

5. A network administrator notices that an internal web server is being accessed from multiple external sources in an unusual pattern. What security proxy feature would help in identifying and mitigating this attack?
Response:

A) Data compression
B) Application-layer filtering
C) DNS caching
D) Port forwarding

Solutions: