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Reliability and Business Continuity →hardMultiple ChoiceObjective-mapped

SOA-C02 Reliability and Business Continuity Practice Question

This SOA-C02 practice question tests your understanding of reliability and business continuity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A SysOps administrator is implementing a disaster recovery strategy for an S3 bucket containing critical data. The bucket must be available within 15 minutes if the primary region fails. Data must be replicated with RPO of less than 5 minutes. Which S3 replication configuration should be used?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

A
Enable S3 Versioning and S3 Same-Region Replication (SRR)
Why wrong: A is incorrect because Same-Region Replication (SRR) does not replicate data to another region, so it cannot provide disaster recovery if the primary region fails.
B
Enable S3 Versioning and configure S3 Event Notifications to trigger a Lambda function that copies objects to another region
B is correct because S3 Event Notifications trigger a Lambda function that copies objects to another region. This can achieve sub-5-minute replication if the function is optimized, and the bucket is accessible in the secondary region within 15 minutes.
C
Enable S3 Versioning and transfer data to another region using AWS DataSync
Why wrong: C is incorrect because AWS DataSync is designed for large-scale, one-time or scheduled transfers, not continuous real-time replication, and cannot guarantee sub-5-minute RPO.
D
Enable S3 Versioning and S3 Cross-Region Replication (CRR) with replication time control (RTC)
Why wrong: D is incorrect because CRR with RTC guarantees replication within 15 minutes (99.99% of objects), but does not meet the less-than-5-minute RPO requirement.

Full breakdown with real-world context →

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

✓

Enable S3 Versioning and configure S3 Event Notifications to trigger a Lambda function that copies objects to another region

Option B is the correct choice because it can meet the RPO of less than 5 minutes by using S3 Event Notifications to trigger a Lambda function that copies objects to another region in near real-time. This approach allows for sub-5-minute replication, and the bucket is available within 15 minutes after failover. S3 Versioning ensures data integrity. While CRR with RTC guarantees replication within 15 minutes, it does not guarantee sub-5-minute RPO. Options A and C either replicate within the same region or are not suitable for continuous, near-real-time replication.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 S3 Same-Region Replication (SRR)
Why it's wrong here
A is incorrect because Same-Region Replication (SRR) does not replicate data to another region, so it cannot provide disaster recovery if the primary region fails.
✓
Enable S3 Versioning and configure S3 Event Notifications to trigger a Lambda function that copies objects to another region
Why this is correct
B is correct because S3 Event Notifications trigger a Lambda function that copies objects to another region. This can achieve sub-5-minute replication if the function is optimized, and the bucket is accessible in the secondary region within 15 minutes.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable S3 Versioning and transfer data to another region using AWS DataSync
Why it's wrong here
C is incorrect because AWS DataSync is designed for large-scale, one-time or scheduled transfers, not continuous real-time replication, and cannot guarantee sub-5-minute RPO.
✗
Enable S3 Versioning and S3 Cross-Region Replication (CRR) with replication time control (RTC)
Why it's wrong here
D is incorrect because CRR with RTC guarantees replication within 15 minutes (99.99% of objects), but does not meet the less-than-5-minute RPO requirement.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap is the assumption that S3 CRR with RTC is the only way to meet both RPO and RTO requirements. However, RTC guarantees only 15-minute replication, not sub-5-minute RPO. Option B provides a more flexible solution that can achieve lower RPO if configured correctly.

Detailed technical explanation

How to think about this question

S3 CRR with RTC uses a dedicated replication queue and monitoring to ensure objects are replicated across regions within a predictable timeframe, with a 99.99% replication SLA within 15 minutes. Under the hood, RTC leverages Amazon S3's internal replication infrastructure with real-time metrics available via Amazon CloudWatch, enabling administrators to track replication lag and receive alerts if thresholds are breached. In a real-world scenario, if the primary region experiences a failure, the replicated bucket in the secondary region can be promoted for read/write access, ensuring business continuity with minimal data loss.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Enable S3 Versioning and configure S3 Event Notifications to trigger a Lambda function that copies objects to another region — Option B is the correct choice because it can meet the RPO of less than 5 minutes by using S3 Event Notifications to trigger a Lambda function that copies objects to another region in near real-time. This approach allows for sub-5-minute replication, and the bucket is available within 15 minutes after failover. S3 Versioning ensures data integrity. While CRR with RTC guarantees replication within 15 minutes, it does not guarantee sub-5-minute RPO. Options A and C either replicate within the same region or are not suitable for continuous, near-real-time replication.

What should I do if I get this SOA-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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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.