- A
Amazon S3
Why wrong: S3 is object storage and is not designed to act as an attached block device for a database.
- B
Amazon EBS
EBS provides persistent block storage that can be attached to an EC2 instance with low latency.
- C
Amazon EFS
Why wrong: EFS is a shared file system, which is useful for multiple instances but not as a block volume.
- D
AWS Storage Gateway
Why wrong: Storage Gateway is for hybrid integration with on-premises environments, not a simple EC2 block volume.
Question 267 of 1,040
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 single EC2 instance hosts a database that needs low-latency block storage and a persistent volume that remains attached to the instance. Which AWS storage service is the best fit?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Amazon EBS provides persistent block-level storage volumes that can be attached to a single EC2 instance, offering low-latency performance suitable for database workloads. Unlike ephemeral instance store volumes, EBS volumes persist independently of the instance's lifecycle, ensuring data durability even when the instance is stopped or terminated.
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 S3
Why it's wrong here
S3 is object storage and is not designed to act as an attached block device for a database.
When this WOULD be correct
A question asking for a durable, scalable object storage solution for storing and retrieving any amount of data from anywhere (e.g., backups, static website hosting, or data lakes) would make S3 correct.
- ✓
Amazon EBS
Why this is correct
EBS provides persistent block storage that can be attached to an EC2 instance with low latency.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon EFS
Why it's wrong here
EFS is a shared file system, which is useful for multiple instances but not as a block volume.
When this WOULD be correct
When the question asks for a shared file system accessible by multiple EC2 instances concurrently, with automatic scaling and POSIX-compliant access, such as for web serving or content management systems.
- ✗
AWS Storage Gateway
Why it's wrong here
Storage Gateway is for hybrid integration with on-premises environments, not a simple EC2 block volume.
When this WOULD be correct
A question that asks for a service to provide on-premises applications with low-latency access to cloud-backed storage for disaster recovery or backup, where the storage needs to be cached locally but backed by AWS, would make Storage Gateway correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Amazon EBSCorrect answer▾
Why this is correct
EBS provides persistent block storage that can be attached to an EC2 instance with low latency.
✗Amazon S3Wrong answer — click to see why▾
Why this is wrong here
Amazon S3 is an object storage service, not block storage, and it does not provide low-latency block-level access or persistent attachment to a single EC2 instance as required.
★ When this WOULD be the correct answer
A question asking for a durable, scalable object storage solution for storing and retrieving any amount of data from anywhere (e.g., backups, static website hosting, or data lakes) would make S3 correct.
Why candidates choose this
Candidates may confuse S3's high durability and availability with block storage performance, or assume S3 can serve as a direct attached volume due to its versatility.
✗Amazon EFSWrong answer — click to see why▾
Why this is wrong here
Amazon EFS provides file-level storage, not block-level, and is designed for shared access across multiple instances, not for low-latency block storage attached to a single EC2 instance.
★ When this WOULD be the correct answer
When the question asks for a shared file system accessible by multiple EC2 instances concurrently, with automatic scaling and POSIX-compliant access, such as for web serving or content management systems.
Why candidates choose this
Candidates may confuse EFS with EBS because both are network-attached storage, and they might think 'persistent volume' implies a file system, overlooking the specific requirement for block storage and single-instance attachment.
✗AWS Storage GatewayWrong answer — click to see why▾
Why this is wrong here
AWS Storage Gateway is a hybrid storage service that connects on-premises environments with AWS cloud storage, not a persistent block storage volume directly attached to a single EC2 instance. It does not provide low-latency block storage that remains attached to an instance like EBS does.
★ When this WOULD be the correct answer
A question that asks for a service to provide on-premises applications with low-latency access to cloud-backed storage for disaster recovery or backup, where the storage needs to be cached locally but backed by AWS, would make Storage Gateway correct.
Why candidates choose this
Candidates may confuse Storage Gateway's ability to present storage volumes to on-premises servers with the need for persistent block storage for EC2, overlooking that Storage Gateway is not designed for direct attachment to EC2 instances.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Amazon EBS with Amazon EFS or S3. While EBS provides persistent block-level storage for a single EC2 instance with low latency, EFS is a file-level storage system designed for shared access across multiple instances, and S3 is an object storage service not suitable for low-latency block storage. Candidates may mistakenly choose EFS thinking it is persistent, but it does not offer block-level access.
Detailed technical explanation
How to think about this question
EBS volumes are replicated within an Availability Zone (AZ) for durability and can be provisioned as gp3, io1, or io2 types to meet specific IOPS and throughput requirements. Under the hood, EBS uses a distributed storage system that delivers consistent sub-millisecond latency for most workloads, and volumes can be detached from one instance and reattached to another in the same AZ, though not across AZs without snapshotting. A real-world scenario is running a transactional database like MySQL or PostgreSQL on an EBS-backed EC2 instance, where the volume persists data across instance stops and starts, unlike instance store volumes that are ephemeral.
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 SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EBS — Amazon EBS provides persistent block-level storage volumes that can be attached to a single EC2 instance, offering low-latency performance suitable for database workloads. Unlike ephemeral instance store volumes, EBS volumes persist independently of the instance's lifecycle, ensuring data durability even when the instance is stopped or terminated.
What should I do if I get this SAA-C03 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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