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CV0-004 Practice Question: Migrating a legacy on-premises application to a…
A company is migrating a legacy on-premises application to a public cloud. The application currently uses a single monolithic architecture and relies on a local file system for storage. The cloud architect needs to redesign the application to take advantage of cloud-native features. Which design principle should the architect prioritize to ensure scalability and resilience?
⚠ Common exam trap
Many candidates confuse vertical scaling (Option B) as a valid cloud-native approach, but the exam emphasizes horizontal scaling and decoupled architectures as the correct principles for scalability and resilience in cloud design.
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
✓
Refactor the application into microservices deployed across multiple instances
Refactoring the monolithic application into microservices enables independent scaling of components, improves fault isolation, and aligns with cloud-native patterns like containerization and orchestration (e.g., Kubernetes). This approach leverages horizontal scaling across multiple instances, which is essential for achieving elasticity and resilience in a public cloud environment, unlike the legacy single-point-of-failure monolithic design.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Maintain the monolithic architecture and connect via VPN to on-premises storage
Why it's wrong here
VPN does not address scalability or resilience.
- ✗
Use vertical scaling by increasing vCPU and RAM on a single large VM
Why it's wrong here
Vertical scaling has limits and does not provide resilience.
- ✓
Refactor the application into microservices deployed across multiple instances
Why this is correct
Microservices enable independent scaling and fault isolation.
- ✗
Deploy the entire application in a single availability zone to reduce latency
Why it's wrong here
Single availability zone lacks high availability.
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JA
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.