- A
Configure the EFS file system for One Zone storage class and mount it using the file system ID.
Why wrong: One Zone storage class stores data in a single AZ; an AZ failure would cause complete data loss and inaccessibility.
- B
Configure the EFS file system for Standard storage class and mount it using the regional DNS name.
Correct. Standard storage class replicates data across multiple AZs, and the regional DNS name resolves to mount targets in all AZs for high availability.
- C
Configure EFS to use provisioned throughput and mount it using a mount target IP address.
Why wrong: Provisioned throughput does not affect data durability across AZs, and using a specific mount target IP ties you to one AZ, reducing availability.
- D
Enable EFS lifecycle management to move files to Infrequent Access storage class.
Why wrong: Lifecycle management optimizes cost by moving data to lower-cost storage classes, but does not impact resilience to AZ failures.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: eFS Standard storage class replicates data 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 company runs a critical application on Amazon EC2 instances. The application uses an NFS file system stored on an Amazon EFS file system. The SysOps administrator must ensure that the file system is highly available and can withstand an Availability Zone failure. The file system must be accessible from all Availability Zones in the region. Which configuration is required to meet these requirements?
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
Configure the EFS file system for Standard storage class and mount it using the regional DNS name.
Option B is correct because the EFS Standard storage class replicates data across multiple Availability Zones (AZs) within a region, providing high availability and resilience against an AZ failure. Mounting the file system using the regional DNS name ensures that clients in any AZ can reach the file system via the nearest mount target, as the regional DNS name resolves to the mount target IP addresses in the local AZ. This configuration meets the requirement for the file system to be accessible from all AZs in the region while withstanding an AZ outage.
Key principle: EFS Standard storage class replicates data 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.
- ✗
Configure the EFS file system for One Zone storage class and mount it using the file system ID.
Why it's wrong here
One Zone storage class stores data in a single AZ; an AZ failure would cause complete data loss and inaccessibility.
- ✓
Configure the EFS file system for Standard storage class and mount it using the regional DNS name.
Why this is correct
Correct. Standard storage class replicates data across multiple AZs, and the regional DNS name resolves to mount targets in all AZs for high availability.
Related concept
EFS Standard storage class replicates data across multiple AZs.
- ✗
Configure EFS to use provisioned throughput and mount it using a mount target IP address.
Why it's wrong here
Provisioned throughput does not affect data durability across AZs, and using a specific mount target IP ties you to one AZ, reducing availability.
- ✗
Enable EFS lifecycle management to move files to Infrequent Access storage class.
Why it's wrong here
Lifecycle management optimizes cost by moving data to lower-cost storage classes, but does not impact resilience to AZ failures.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse storage class (One Zone vs. Standard) with performance settings (provisioned throughput) or cost-saving features (lifecycle management), and overlook that the regional DNS name is essential for multi-AZ access and failover.
Detailed technical explanation
How to think about this question
Under the hood, EFS Standard uses a regional service endpoint and automatically creates mount targets in each AZ of the region, each with a private IP address. The regional DNS name (e.g., fs-12345678.efs.us-east-1.amazonaws.com) uses DNS-based load balancing to resolve to the mount target IP in the client's AZ, ensuring low-latency access and automatic failover if an AZ becomes unavailable. In a real-world scenario, if an application in us-east-1a fails, the regional DNS name would resolve to the mount target in us-east-1b or us-east-1c, allowing the application to continue accessing the same file system without manual intervention.
KKey Concepts to Remember
- EFS Standard storage class replicates data across multiple AZs.
- Regional DNS name resolves to mount targets in all AZs for high availability.
- One Zone storage class is not resilient to AZ failures.
- Mounting with regional DNS ensures automatic failover between AZs.
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 Standard storage class replicates data 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 Standard storage class replicates data across multiple AZs., then practise related SOA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — EFS Standard storage class replicates data across multiple AZs..
What is the correct answer to this question?
The correct answer is: Configure the EFS file system for Standard storage class and mount it using the regional DNS name. — Option B is correct because the EFS Standard storage class replicates data across multiple Availability Zones (AZs) within a region, providing high availability and resilience against an AZ failure. Mounting the file system using the regional DNS name ensures that clients in any AZ can reach the file system via the nearest mount target, as the regional DNS name resolves to the mount target IP addresses in the local AZ. This configuration meets the requirement for the file system to be accessible from all AZs in the region while withstanding an AZ outage.
What should I do if I get this SOA-C02 question wrong?
Review eFS Standard storage class replicates data across multiple AZs., then practise related SOA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
EFS Standard storage class replicates data across multiple AZs.
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Last reviewed: Jun 11, 2026
This SOA-C02 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 SOA-C02 exam.
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