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CV0-004 Practice Question: A cloud architect is designing a multi-tier web…
A cloud architect is designing a multi-tier web application in a cloud environment. The application must handle unpredictable traffic spikes while minimizing costs. The architect decides to use auto-scaling groups for the web tier and a managed database service for the data tier. Which additional design consideration is MOST important to ensure the application remains available during a regional outage?
⚠ Common exam trap
CompTIA often tests the misconception that scaling up (increasing instance size) or using read replicas alone can provide high availability, when in fact only distributing resources across multiple Availability Zones ensures fault tolerance against an AZ outage.
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
✓
Distribute the auto-scaling group across multiple availability zones
Distributing the auto-scaling group across multiple Availability Zones (AZs) ensures that if one AZ fails, the web tier continues to serve traffic from the remaining AZs. This is the most critical design consideration for maintaining availability during a regional outage because it provides fault isolation at the AZ level, which is a fundamental principle of high availability in cloud architecture.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Distribute the auto-scaling group across multiple availability zones
Why this is correct
Multi-AZ deployment ensures high availability during zone failures.
- ✗
Configure the auto-scaling group to burst into on-premises resources during spikes
Why it's wrong here
On-premises bursting is not standard and may not be feasible.
- ✗
Increase the size of the web tier instances to handle more traffic
Why it's wrong here
Vertical scaling does not provide redundancy.
- ✗
Use a read replica of the database to distribute read traffic
Why it's wrong here
Read replicas do not provide automatic failover for writes.
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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.