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. A key principle to apply: eFS is a regional service, providing high availability across multiple AZs.. 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? The team wants the control to be enforceable during normal operations.
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, POSIX-compliant NFS file system that can be mounted concurrently on multiple Linux EC2 instances across different Availability Zones. By creating mount targets in each AZ, the file system remains accessible even if one AZ fails, because the other mount targets continue to serve traffic. EFS also supports lifecycle policies and IAM enforcement to control access during normal operations, meeting the requirement for enforceable control.
Key principle: EFS is a regional service, providing high availability across multiple AZs.
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
EFS is a regional service, providing high availability across multiple AZs.
✗
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 often confuse EBS multi-attach (which is limited to specific instance types and a single AZ) with the cross-AZ shared file system capability that only EFS provides, or they mistakenly think S3 with a FUSE mount is a reliable POSIX file system for production workloads.
Detailed technical explanation
How to think about this question
EFS uses a distributed data storage layer that replicates file data across multiple AZs within a region, providing 99.999999999% (11 nines) durability. Mount targets are elastic network interfaces (ENIs) in each AZ that route NFSv4.1 traffic to the file system; if one AZ fails, the DNS name resolves to the remaining healthy mount targets automatically. EFS also supports encryption at rest using AWS KMS and in transit using TLS, and IAM policies can enforce mount permissions and access points for granular control.
KKey Concepts to Remember
EFS is a regional service, providing high availability across multiple AZs.
EFS supports the NFSv4 protocol for Linux EC2 instances.
EFS automatically scales storage capacity and performance.
EFS provides shared file storage that can be mounted by multiple EC2 instances concurrently.
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
EFS is a regional service, providing high availability across multiple AZs.
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.
Review eFS is a regional service, providing high availability across multiple AZs., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Resilient Architectures — This question tests Design Resilient Architectures — EFS is a regional service, providing high availability across multiple AZs..
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, POSIX-compliant NFS file system that can be mounted concurrently on multiple Linux EC2 instances across different Availability Zones. By creating mount targets in each AZ, the file system remains accessible even if one AZ fails, because the other mount targets continue to serve traffic. EFS also supports lifecycle policies and IAM enforcement to control access during normal operations, meeting the requirement for enforceable control.
What should I do if I get this SAA-C03 question wrong?
Review eFS is a regional service, providing high availability across multiple AZs., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
EFS is a regional service, providing high availability across multiple AZs.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SAA-C03 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 SAA-C03 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.