SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. 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 warehouse integration service must use shared file storage across Linux EC2 instances in multiple Availability Zones. The storage must remain available during an AZ failure. Which service should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon EFS with mount targets in multiple Availability Zones
Amazon EFS provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently on multiple Linux EC2 instances across different Availability Zones. By configuring mount targets in each AZ, the file system remains accessible even if one AZ fails, because the other mount targets continue to serve traffic. This meets the requirement for shared, highly available file storage across AZs.
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 with mount targets in multiple Availability Zones
Why this is correct
EFS is regional file storage and supports mount targets across AZs.
Related concept
Read the scenario before looking for a memorised answer.
✗
S3 mounted as a POSIX file system without a file gateway
Why it's wrong here
S3 is object storage and does not provide native POSIX shared file semantics.
✗
Instance store volumes
Why it's wrong here
Instance store is ephemeral and tied to a single instance.
✗
An EBS volume attached to all instances
Why it's wrong here
A standard EBS volume is zonal and cannot be attached broadly as shared file storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse EBS multi-attach (which has strict limitations and is not suitable for shared file systems across AZs) with a true distributed file system like EFS, or assume that S3 with a FUSE driver can replace a POSIX-compliant shared file system.
Detailed technical explanation
How to think about this question
EFS uses the NFSv4.1 protocol, which supports file locking and consistent metadata across all mount targets. Under the hood, EFS stores data redundantly across multiple AZs within a region, and each mount target is an endpoint in a specific subnet that routes NFS traffic to the EFS file system. In a real-world scenario, if an AZ fails, the mount targets in that AZ become unreachable, but instances in other AZs continue to access the file system through their local mount targets without interruption.
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.
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.
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EFS with mount targets in multiple Availability Zones — Amazon EFS provides a fully managed, scalable, and elastic NFS file system that can be mounted concurrently on multiple Linux EC2 instances across different Availability Zones. By configuring mount targets in each AZ, the file system remains accessible even if one AZ fails, because the other mount targets continue to serve traffic. This meets the requirement for shared, highly available file storage across AZs.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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