CV0-004 Cloud Architecture and Design Practice Question
A company is designing a disaster recovery plan for its critical application. The application must be recovered within 4 hours (RTO) and can tolerate up to 1 hour of data loss (RPO). Which replication strategy is most cost-effective?
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
✓
Asynchronous replication
Asynchronous replication meets the RPO of 1 hour (data loss up to 1 hour) and can be lower cost than synchronous replication, which requires high bandwidth. Synchronous replication would be more expensive and unnecessary. No replication would not meet RPO. Daily backups would exceed RPO.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
No replication; rely on backups restored from archive
Why it's wrong here
Restoring from archive typically takes many hours or days, breaching the four-hour RTO, and archive backups are usually taken daily, also breaching the one-hour RPO. Archive restoration suits long-term retention or non-critical systems where recovery time is measured in days.
- ✓
Asynchronous replication
Why this is correct
Asynchronous replication copies changes after acknowledgement, so a site can lag by up to an hour — matching the one-hour RPO — while costing far less than synchronous replication, which would need low-latency links to meet a near-zero RPO the business does not require.
- ✗
Synchronous replication
Why it's wrong here
Synchronous replication writes to both sites before acknowledging, so it meets the one-hour RPO but demands low-latency links and duplicate infrastructure, making it the least cost-effective. It suits zero-data-loss requirements where cost is secondary to an RPO of seconds.
- ✗
Daily snapshots with no replication
Why it's wrong here
Daily snapshots capture data once every 24 hours, so up to 24 hours of loss exceeds the one-hour RPO. Snapshots are tempting because they are cheap and simple for non-critical workloads with relaxed recovery objectives, where losing a day's data is acceptable.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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