easyMultiple ChoiceObjective-mapped
CV0-004 Practice Question: A systems administrator needs to apply a critical…
A systems administrator needs to apply a critical security patch to a set of application servers running in a cloud environment. The administrator wants to minimize downtime and ensure that if the patch causes issues, the servers can be rolled back quickly. Which of the following is the BEST approach?
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
✓
Use a blue-green deployment, patch the green environment, then switch traffic.
Blue-green deployment allows zero-downtime patching by switching traffic from the current (blue) environment to the patched (green) environment, and if issues occur, traffic can be switched back instantly, providing immediate rollback. Option A is incorrect because patching all servers at once causes downtime and no quick rollback. Option B is incorrect because taking snapshots before patching and restoring if needed incurs downtime during restore and is not as quick as switching traffic. Option C is incorrect because using an automated configuration management tool to apply patches gradually may not provide instant rollback and could still cause partial downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Patch all servers at once during a maintenance window.
Why it's wrong here
This causes full downtime and rolling back requires patching again or restoring from backup.
- ✗
Take a snapshot of each server, apply the patch, and if issues occur, restore from snapshot.
Why it's wrong here
Restoring from snapshot requires downtime and takes time to complete.
- ✗
Use an automated configuration management tool to apply the patch gradually.
Why it's wrong here
Gradual application reduces impact but rollback may require reverting configuration states, which is not instant.
- ✓
Use a blue-green deployment, patch the green environment, then switch traffic.
Why this is correct
Blue-green deployment provides zero-downtime updates and instant rollback by switching to the blue environment.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.