CV0-004 Cloud Architecture and Design Practice Question
A cloud architect is designing a multi-region application on AWS. The application has a critical database that must tolerate the failure of an entire AWS region. Which strategy provides the lowest RTO while ensuring data consistency?
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-passive with synchronous replication
Active-passive with synchronous replication provides the lowest RTO for regional failure because the standby region has up-to-date data and can be promoted quickly, though synchronous replication may impact performance. Active-active requires conflict resolution. Asynchronous replication has higher RPO. Multi-cloud adds complexity and latency.
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 with synchronous replication
Why this is correct
Synchronous replication ensures data consistency; passive standby can be promoted quickly, minimizing RTO.
- ✗
Active-active with asynchronous replication
Why it's wrong here
Asynchronous replication may result in data loss, increasing RPO.
- ✗
Active-passive with asynchronous replication
Why it's wrong here
Asynchronous replication may have data loss; but RTO can still be low if the standby is ready.
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Multi-cloud active-active with eventual consistency
Why it's wrong here
Multi-cloud adds complexity and latency; eventual consistency may not be acceptable for critical databases.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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