- A
Amazon EFS
Why wrong: EFS is durable but not as resilient as S3 for object storage.
- B
Amazon EBS with RAID 1
RAID 1 mirrors data across multiple EBS volumes for redundancy.
- C
Amazon S3 Glacier Deep Archive
Why wrong: Glacier is for archival, not active high availability.
- D
Amazon S3
S3 is designed for 11 9s durability and high availability.
- E
Amazon EC2 instance store
Why wrong: Instance store data is lost when the instance stops.
Question 335 of 1,750
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is designing a resilient storage solution for a critical application. The data must be highly available and durable. Which TWO services meet these requirements? (Choose TWO.)
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
✓
Amazon EBS with RAID 1
Amazon S3 (Option D) provides 99.999999999% durability and 99.99% availability by automatically replicating data across multiple Availability Zones (AZs) within a region, making it ideal for highly available and durable storage. Amazon EBS with RAID 1 (Option B) mirrors data across two EBS volumes in the same AZ, offering enhanced durability and availability compared to a single volume, though it remains AZ-bound. Both services meet the requirements for a resilient storage solution.
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.
- ✗
Amazon EFS
Why it's wrong here
EFS is durable but not as resilient as S3 for object storage.
- ✓
Amazon EBS with RAID 1
Why this is correct
RAID 1 mirrors data across multiple EBS volumes for redundancy.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3 Glacier Deep Archive
Why it's wrong here
Glacier is for archival, not active high availability.
- ✓
Amazon S3
Why this is correct
S3 is designed for 11 9s durability and high availability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon EC2 instance store
Why it's wrong here
Instance store data is lost when the instance stops.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overlook that Amazon EBS with RAID 1 (Option B) is a valid resilient storage solution when configured correctly, while dismissing it because EBS volumes are AZ-bound, but RAID 1 mitigates single-volume failures within the same AZ, and the question does not require cross-AZ resilience.
Detailed technical explanation
How to think about this question
Amazon S3 achieves 11 nines of durability through automatic synchronous replication across at least three AZs using a distributed storage system with erasure coding (e.g., Reed-Solomon codes) and checksums for integrity. EBS with RAID 1 uses software RAID (e.g., mdadm on Linux) to mirror writes to two volumes, providing protection against a single volume failure, but it does not protect against AZ failures; for cross-AZ resilience, you would need to use EBS snapshots or replication. The key distinction is that S3 is object storage with built-in multi-AZ redundancy, while EBS RAID 1 is a manual configuration for block storage within a single AZ.
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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EBS with RAID 1 — Amazon S3 (Option D) provides 99.999999999% durability and 99.99% availability by automatically replicating data across multiple Availability Zones (AZs) within a region, making it ideal for highly available and durable storage. Amazon EBS with RAID 1 (Option B) mirrors data across two EBS volumes in the same AZ, offering enhanced durability and availability compared to a single volume, though it remains AZ-bound. Both services meet the requirements for a resilient storage solution.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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