- A
Amazon EBS Multi-Attach
Why wrong: EBS Multi-Attach allows a volume to be attached to multiple EC2 instances but is limited to instances in the same AZ and only supports specific instance types — not designed for thousands of concurrent users.
- B
Amazon EFS
EFS scales automatically to support thousands of concurrent NFS connections from Linux instances across multiple AZs, with no capacity planning required.
- C
Amazon S3
Why wrong: S3 is object storage accessed via HTTP API — it doesn't provide a POSIX file system interface for applications that expect NFS semantics.
- D
Amazon FSx for Windows File Server
Why wrong: FSx for Windows provides SMB file shares for Windows clients — EFS is the choice for Linux NFS workloads.
Question 972 of 1,024
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company needs to provide secure, scalable file storage for thousands of concurrent users accessing the same shared file system from Linux-based EC2 instances. Which AWS service is most appropriate?
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
✓
Amazon EFS
Amazon EFS (Elastic File System) is the correct choice because it provides a fully managed, scalable, and elastic NFS file system that can be concurrently accessed by thousands of Linux-based EC2 instances. It automatically scales storage capacity up and down as files are added or removed, and it supports the NFSv4.1 and NFSv4.0 protocols, making it ideal for shared file workloads on Linux.
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 EBS Multi-Attach
Why it's wrong here
EBS Multi-Attach allows a volume to be attached to multiple EC2 instances but is limited to instances in the same AZ and only supports specific instance types — not designed for thousands of concurrent users.
- ✓
Amazon EFS
Why this is correct
EFS scales automatically to support thousands of concurrent NFS connections from Linux instances across multiple AZs, with no capacity planning required.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3
Why it's wrong here
S3 is object storage accessed via HTTP API — it doesn't provide a POSIX file system interface for applications that expect NFS semantics.
- ✗
Amazon FSx for Windows File Server
Why it's wrong here
FSx for Windows provides SMB file shares for Windows clients — EFS is the choice for Linux NFS workloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon EBS Multi-Attach with a true shared file system, not realizing it is limited to a small number of instances in the same AZ and requires application-level coordination for writes, making it unsuitable for thousands of concurrent users.
Detailed technical explanation
How to think about this question
Under the hood, Amazon EFS uses a distributed data storage architecture that replicates file data across multiple Availability Zones (for Standard storage classes) or within a single AZ (for One Zone), providing high durability and availability. It leverages the NFSv4.1 protocol with support for file locking and strong consistency, and it automatically scales throughput performance based on the amount of data stored (Bursting Throughput mode) or can be provisioned with a fixed throughput (Provisioned Throughput mode). A real-world scenario where this matters is a media processing pipeline where thousands of EC2 instances need to read and write video files concurrently—EFS handles the load without manual capacity planning.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — 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 (Elastic File System) is the correct choice because it provides a fully managed, scalable, and elastic NFS file system that can be concurrently accessed by thousands of Linux-based EC2 instances. It automatically scales storage capacity up and down as files are added or removed, and it supports the NFSv4.1 and NFSv4.0 protocols, making it ideal for shared file workloads on Linux.
What should I do if I get this CLF-C02 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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Last reviewed: Jun 11, 2026
This CLF-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 CLF-C02 exam.
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