Quick Answer
The correct choices are Amazon S3 and Amazon EBS volumes in a RAID 1 configuration. Amazon S3 delivers 99.999999999% durability by automatically replicating objects across multiple Availability Zones, making it the gold standard for highly durable storage services. EBS RAID 1, on the other hand, mirrors data across two volumes within a single Availability Zone, providing redundancy against disk failure but not against zone failure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your ability to distinguish between durability mechanisms and their scope: S3 offers cross-AZ durability, while EBS RAID 1 offers intra-AZ resilience. A common trap is confusing instance store (ephemeral) or S3 Glacier (archival) with high-availability storage. Remember the mnemonic: S3 for “Spread across three” (AZs), RAID 1 for “One zone, mirror done.”
This DOP-C02 practice question tests your understanding of resilient cloud solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.)
Amazon EFS
Why wrong: EFS is durable but not as resilient as S3 for object storage.
Amazon EBS with RAID 1
RAID 1 mirrors data across multiple EBS volumes for redundancy.
Amazon S3 Glacier Deep Archive
Why wrong: Glacier is for archival, not active high availability.
Amazon S3
S3 is designed for 11 9s durability and high availability.
Amazon EC2 instance store
Why wrong: Instance store data is lost when the instance stops.
Answer choices
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
Options B and D are correct. B: Amazon S3 provides 99.999999999% durability and is highly available. D: Amazon EBS volumes in a RAID 1 configuration provide redundancy within an AZ. A is wrong because instance store is ephemeral. C is wrong because EFS is a file system, not necessarily the highest durability. E is wrong because S3 Glacier is for archival, not high availability.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Resilient Cloud Solutions — study guide chapter
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FAQ
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon EBS with RAID 1 — Options B and D are correct. B: Amazon S3 provides 99.999999999% durability and is highly available. D: Amazon EBS volumes in a RAID 1 configuration provide redundancy within an AZ. A is wrong because instance store is ephemeral. C is wrong because EFS is a file system, not necessarily the highest durability. E is wrong because S3 Glacier is for archival, not high availability.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This DOP-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 DOP-C02 exam.
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