312-39 Incident Response Practice Question
When an analyst suspects that a malicious user is using a VPN to hide their source IP, which technique is most helpful for attribution?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Comparing source IP against threat intel feeds of VPN exit nodes
Reviewing connection logs for anomalous login times and comparing them against known VPN exit node lists is the primary technique.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Analyzing DNS queries
Why it's wrong here
This identifies intent, not source origin.
- ✗
Checking OS version
Why it's wrong here
OS version is easy to spoof.
- ✓
Comparing source IP against threat intel feeds of VPN exit nodes
Why this is correct
This is the standard approach to identify proxy/VPN usage.
- ✗
Scanning the source IP
Why it's wrong here
Scanning external IPs is often illegal or against policy.
About these practice questions
Courseiva writes every 312-39 question from scratch — 202 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official EC-Council exam blueprint
This 312-39 practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 312-39 exam.