212-89 Malware Incidents Practice Question
A malware infection has encrypted several network shares. You decide to restore from backups. What is the most critical step to perform before restoring data to the production environment?
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
✓
Restore data to a sandbox or isolated VLAN
Restoring data into a clean, isolated environment is critical to ensure that the malware is not re-introduced or that the backup itself is not infected.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Scan the backup media with the same AV used previously
Why it's wrong here
If the AV missed it once, it will likely miss it again.
- ✗
Reboot the domain controllers
Why it's wrong here
This does not address the data infection issue.
- ✓
Restore data to a sandbox or isolated VLAN
Why this is correct
Isolation prevents reinfection of the production network.
- ✗
Change all user passwords
Why it's wrong here
While necessary eventually, it doesn't protect the integrity of the restored files.
About these practice questions
One of 206 original 212-89 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 212-89 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 212-89 exam.