SOA-C02 Reliability and Business Continuity Practice Question
A SysOps administrator is tasked with ensuring that an Amazon S3 bucket can withstand the loss of an entire AWS Region. The bucket stores critical data that must be accessible with minimal latency from multiple regions. Which solution meets these requirements?
⚠ Common exam trap
Watch out — candidates often confuse S3 Transfer Acceleration or Versioning with multi-region replication, failing to recognize that only CRR provides cross-region data redundancy and that CloudFront with multiple origins is needed for low-latency access and automatic failover.
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
✓
Configure S3 Cross-Region Replication to a bucket in another AWS Region. Use Amazon CloudFront with multiple origins pointing to both buckets.
S3 Cross-Region Replication (CRR) automatically replicates objects to a bucket in another AWS Region, ensuring data survives a regional failure. Using Amazon CloudFront with multiple origins pointing to both buckets provides low-latency access from any region by routing requests to the nearest healthy origin, meeting both durability and performance requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable S3 Versioning and configure a lifecycle policy to transition objects to S3 Glacier Deep Archive.
Why it's wrong here
Although S3 Versioning preserves every object version and protects against accidental overwrites or deletes, it does not copy data to a second AWS Region. Transitioning noncurrent versions to S3 Glacier Deep Archive only addresses long-term storage cost and retrieval latency, not regional resilience; Glacier Deep Archive is inappropriate for active access because restore can take up to 12 hours. No cross-region redundancy is created by this configuration.
- ✓
Configure S3 Cross-Region Replication to a bucket in another AWS Region. Use Amazon CloudFront with multiple origins pointing to both buckets.
Why this is correct
S3 Cross-Region Replication asynchronously copies every uploaded object to a destination bucket in a different Region, giving the bucket contents regional redundancy; versioning must be enabled on both source and destination for CRR to function. Amazon CloudFront can be configured with an origin group containing both buckets—one as primary and one as secondary—so that if the primary origin returns an error or is unreachable, CloudFront automatically fails over to the replicated bucket in the other Region. This combination provides both replicated durability and low-latency edge delivery, supporting failover without manual intervention.
- ✗
Enable S3 Versioning and MFA Delete on the bucket. Use S3 Object Lock to prevent object deletion.
Why it's wrong here
Enabling versioning, requiring MFA Delete, and applying S3 Object Lock give strong safeguards against accidental or unauthorized deletion. Object Lock with retention modes or legal holds enforces a write-once-read-many model and compliance retention, but all of this protection is scoped to a single bucket and a single AWS Region. If the entire Region loses power or connectivity, these controls cannot make the data accessible elsewhere; they are governance mechanisms, not disaster-recovery mechanisms, and no data is copied to another Region.
- ✗
Enable S3 Transfer Acceleration on the bucket and use a CloudFront distribution with the bucket as the origin.
Why it's wrong here
S3 Transfer Acceleration uses AWS edge locations and the global network to speed up uploads to a single bucket, which can improve client upload time but has no effect on how objects are stored or duplicated. A CloudFront distribution with that bucket as the origin can cache and serve content from edge locations, but it still pulls the underlying objects from that one bucket. This setup improves upload and performance but does not replicate data to a second Region; a Regional outage would make the origin unavailable, and only previously cached CloudFront content would remain temporarily served.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services 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 SOA-C02 exam.