Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
Several EC2 instances in different Availability Zones need to read and write the same shared file system. The file storage should stay available if one AZ has a problem. Which service should the team choose?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Amazon EBS
EBS volumes attach to one EC2 instance at a time and are not designed for shared multi-instance file access.
B
Best answer
Amazon EFS
Amazon EFS is a managed shared file system that can be mounted by multiple EC2 instances across multiple Availability Zones. It is a strong fit when applications need the same files at the same time and must remain available even if one AZ experiences issues. The service is highly available by design and reduces operational work compared with self-managed file servers.
C
Distractor review
Amazon S3 only
S3 is object storage, not a mounted shared file system for POSIX-style file access.
D
Distractor review
Instance store
Instance store is ephemeral and tied to the lifecycle of the instance, so it is not durable shared storage.
Common exam trap
Common exam trap: answer the scenario, not the keyword
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.
Technical deep dive
How to think about this question
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.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Amazon EFS — Amazon EFS is the right choice for shared file workloads that must be accessed by multiple EC2 instances across Availability Zones. It provides a managed network file system with high availability and durability, so the application can keep using the same data even if one AZ is impaired. This is the common AWS answer for shared Linux file storage when you need file semantics rather than object storage. Why others are wrong: EBS is attached to a single instance and does not provide shared multi-instance access in the usual architecture. S3 is durable and scalable, but it is object storage, not a mounted file system. Instance store is temporary storage and disappears when the instance stops or fails, so it is not suitable for resilient shared data.
What should I do if I get this SAA-C03 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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