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GIAC Network Forensic Analyst (GNFA) Sample Questions:

1. You are analyzing network traffic and find a series of communications using an unknown protocol. The traffic appears structured, but there is no official documentation available. What should be your first step?
Response:

A) Search for open-source documentation
B) Capture and inspect the packets using Wireshark
C) Block all traffic using the protocol immediately
D) Attempt brute-force decryption

2. Which of the following techniques are used to obfuscate encoded data?
(Select two.)
Response:

A) Base64 encoding
B) XOR encryption
C) SHA-256 hashing
D) URL encoding

3. What technique is used to analyze an unknown protocol by observing repeated patterns and structure in network traffic?
Response:

A) Fuzzing
B) Statistical analysis
C) Code injection
D) SQL injection

4. Which log sources are commonly used for detecting insider threats?
(Select two.)
Response:

A) IDS/IPS logs
B) DNS logs
C) Email logs
D) File access logs

5. What is the primary purpose of a network security proxy?
Response:

A) To block all outbound connections from an organization
B) To act as an intermediary between clients and servers, filtering and monitoring traffic
C) To replace the need for firewalls
D) To encrypt all internal network traffic

Solutions: