SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. 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.
Exhibit
Deployment notes for a media-processing Auto Scaling group:
- 6 EC2 instances across 2 Availability Zones
- Each node compiles project artifacts and writes them to /workspace/output
- Other nodes must immediately see the same files for the next pipeline stage
- Files must persist when an instance is replaced or scaled in/out
- Logs show failures such as:
[ERROR] missing artifact: /workspace/output/frame_2048.png
[WARN] local copy not found after instance termination
Based on the exhibit, which storage design best supports the application servers' shared working directory requirement?
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.
Deployment notes for a media-processing Auto Scaling group:
- 6 EC2 instances across 2 Availability Zones
- Each node compiles project artifacts and writes them to /workspace/output
- Other nodes must immediately see the same files for the next pipeline stage
- Files must persist when an instance is replaced or scaled in/out
- Logs show failures such as:
[ERROR] missing artifact: /workspace/output/frame_2048.png
[WARN] local copy not found after instance termination
A
Mount Amazon EFS on every EC2 instance and use it as the shared workspace.
EFS provides shared, persistent, POSIX-compliant file access across multiple EC2 instances and Availability Zones. That matches the requirement that all nodes see the same workspace immediately and that files survive instance replacement. It is the right choice when the application needs a common filesystem rather than an object store or local-only disk.
B
Attach one gp3 EBS volume to each instance and synchronize the files with cron jobs.
Why wrong: Separate EBS volumes are local to each instance, so they do not provide a shared workspace or immediate consistency across nodes.
C
Store the artifacts in S3 and have each node read them directly from S3 as a filesystem.
Why wrong: S3 is object storage, not a shared POSIX filesystem, so it does not satisfy the low-latency shared directory requirement.
D
Use instance store on each instance because it provides the fastest local file access.
Why wrong: Instance store is fast, but it is ephemeral and local to one machine, so other nodes cannot share it and replacements lose data.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Mount Amazon EFS on every EC2 instance and use it as the shared workspace.
Amazon EFS provides a fully managed, NFS-based shared file system that can be mounted concurrently on multiple EC2 instances across multiple Availability Zones. This directly satisfies the requirement for a shared working directory where all application servers can read and write files simultaneously without additional synchronization overhead.
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.
✓
Mount Amazon EFS on every EC2 instance and use it as the shared workspace.
Why this is correct
EFS provides shared, persistent, POSIX-compliant file access across multiple EC2 instances and Availability Zones. That matches the requirement that all nodes see the same workspace immediately and that files survive instance replacement. It is the right choice when the application needs a common filesystem rather than an object store or local-only disk.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Attach one gp3 EBS volume to each instance and synchronize the files with cron jobs.
Why it's wrong here
Separate EBS volumes are local to each instance, so they do not provide a shared workspace or immediate consistency across nodes.
✗
Store the artifacts in S3 and have each node read them directly from S3 as a filesystem.
Why it's wrong here
S3 is object storage, not a shared POSIX filesystem, so it does not satisfy the low-latency shared directory requirement.
✗
Use instance store on each instance because it provides the fastest local file access.
Why it's wrong here
Instance store is fast, but it is ephemeral and local to one machine, so other nodes cannot share it and replacements lose data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse object storage (S3) with shared file storage, assuming S3 can serve as a drop-in replacement for a POSIX filesystem, but S3 lacks file locking, atomic renames, and low-latency metadata operations required for a shared working directory.
Detailed technical explanation
How to think about this question
EFS uses the NFSv4.1 protocol and supports concurrent access from thousands of EC2 instances across multiple Availability Zones, with automatic scaling of throughput and storage capacity. Under the hood, EFS distributes data across multiple AZs within a region, providing 99.999999999% (11 nines) durability and consistent performance via a burst credit model or provisioned throughput. In a real-world scenario, a shared working directory for application servers (e.g., for web content, build artifacts, or collaborative editing) benefits from EFS's native file locking and strong read-after-write consistency, which S3 cannot guarantee for concurrent writes.
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 High-Performing Architectures — This question tests Design High-Performing Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Mount Amazon EFS on every EC2 instance and use it as the shared workspace. — Amazon EFS provides a fully managed, NFS-based shared file system that can be mounted concurrently on multiple EC2 instances across multiple Availability Zones. This directly satisfies the requirement for a shared working directory where all application servers can read and write files simultaneously without additional synchronization overhead.
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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Question Discussion
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