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CV0-004 Practice Question: Migrating its on-premises application to the…
A company is migrating its on-premises application to the cloud and wants to ensure high availability across multiple geographic regions. The application consists of stateless web servers and a stateful database. Which architecture should the company implement?
⚠ Common exam trap
CompTIA often tests the misconception that read replicas alone provide high availability for a stateful database, but candidates must remember that read replicas are read-only and cannot handle writes, so they do not ensure full database availability during a primary failure.
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
✓
Active-active web servers in two regions with a multi-region database replication
The application requires high availability across multiple geographic regions for both stateless web servers and a stateful database. Active-active web servers in two regions ensure traffic distribution and failover, while multi-region database replication (e.g., using synchronous or asynchronous replication such as MySQL Group Replication or Aurora Global Database) keeps the stateful database synchronized across regions, enabling read/write capabilities and automatic failover without data loss.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Active-passive web servers in two regions with a single database in the primary region
Why it's wrong here
Single database is a single point of failure.
- ✗
Active-active web servers in two regions with read replicas in each region
Why it's wrong here
Read replicas do not handle write failures.
- ✓
Active-active web servers in two regions with a multi-region database replication
Why this is correct
Multi-region replication allows failover for both reads and writes.
- ✗
Active-active web servers in one region with a standby database in another region
Why it's wrong here
Standby database may not be promoted quickly enough.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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