312-39 Incident Response Practice Question
During a suspected malware incident, a SOC analyst needs to isolate an infected workstation using Microsoft Defender for Endpoint. Which specific action should the analyst select within the Device inventory dashboard?
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
✓
Isolate device
Isolate device stops network traffic to the host while keeping the communication with the Microsoft Defender for Endpoint service open.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Restrict application execution
Why it's wrong here
This restricts app launches but does not disconnect the network.
- ✓
Isolate device
Why this is correct
Isolate device is the correct action to contain the threat by severing network connectivity.
- ✗
Device tagging
Why it's wrong here
Tagging is for organization, not containment.
- ✗
Run antivirus scan
Why it's wrong here
This is a remediation action, not a containment action.
About these practice questions
One of 201 original 312-39 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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.