312-39 Incident Response Practice Question
You are managing a containment procedure for an external C2 callback. Which firewall rule configuration is most effective for immediate containment?
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
✓
Deny egress to the specific destination IP
Blocking the egress connection to the specific malicious IP at the perimeter firewall is the fastest way to stop C2 communication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Allow all, then log
Why it's wrong here
This permits the C2 traffic.
- ✗
Enable Intrusion Prevention System (IPS) in 'Alert' mode
Why it's wrong here
Alert mode will not block the connection.
- ✗
Enable SSL Inspection
Why it's wrong here
This is for monitoring, not blocking.
- ✓
Deny egress to the specific destination IP
Why this is correct
This terminates the C2 channel immediately.
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.