CLF-C02 Cloud Technology and Services Practice Question
A company runs a web application across multiple Amazon EC2 instances that are distributed across several Availability Zones. The application needs to share a common set of configuration files and static assets that must be accessible concurrently and consistently from all instances. The company wants a fully managed, scalable file storage solution that does not require provisioning or managing underlying storage hardware. Which AWS service should the company use?
⚠ Common exam trap
It's easy for candidates to confuse Amazon S3's object storage capabilities with a shared file system, overlooking that S3 does not support POSIX file locking or concurrent mount-based access required for shared configuration files across EC2 instances.
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 Elastic File System (EFS)
Amazon EFS provides a fully managed, scalable, and shared file system that can be mounted concurrently by multiple EC2 instances across different Availability Zones. It uses the NFSv4.1 protocol, ensuring consistent access to configuration files and static assets without any provisioning or management of underlying storage hardware.
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 Elastic File System (EFS)
Why this is correct
Correct. Amazon EFS provides a fully managed NFS file system that can be mounted on multiple EC2 instances across multiple Availability Zones simultaneously. It scales automatically and is designed for high availability and durability, making it ideal for shared file access.
- ✗
Amazon Elastic Block Store (EBS)
Why it's wrong here
Incorrect. An Amazon EBS volume is a block-level storage device that can only be attached to a single EC2 instance (except for the limited Multi-Attach capability on some volume types, which is not intended for general concurrent file sharing and has strict constraints). It cannot serve as a shared file system across multiple instances in different Availability Zones.
When this WOULD be correct
A company runs a single EC2 instance that needs low-latency, persistent block storage for a database or transactional workload. The question specifies a single instance and requires high performance and durability, with no need for multi-instance shared access.
- ✗
Amazon Simple Storage Service (S3)
Why it's wrong here
Incorrect. Amazon S3 is an object storage service designed for storing and retrieving large amounts of data via HTTP/HTTPS. It does not provide a file-system interface or support for standard file-level locking required for concurrent access by multiple EC2 instances as a shared file system.
When this WOULD be correct
A company needs to store and serve large amounts of static assets (e.g., images, videos) for a web application with high scalability and durability, and the application can access objects via HTTP APIs. The question would specify that the assets are accessed via URLs and do not require file system semantics.
- ✗
Amazon Relational Database Service (RDS)
Why it's wrong here
Incorrect. Amazon RDS is a managed service for setting up, operating, and scaling relational databases. It is not a file storage solution and cannot be used to share configuration files or static assets among EC2 instances.
When this WOULD be correct
A company needs a fully managed relational database with automated backups, patching, and replication across multiple Availability Zones for a web application's transactional data. The question would specify requirements for structured data with SQL queries and ACID compliance.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Amazon Elastic File System (EFS)Correct answer▾
Why this is correct
Correct. Amazon EFS provides a fully managed NFS file system that can be mounted on multiple EC2 instances across multiple Availability Zones simultaneously. It scales automatically and is designed for high availability and durability, making it ideal for shared file access.
✗Amazon Elastic Block Store (EBS)Wrong answer — click to see why▾
Why this is wrong here
Amazon EBS provides block-level storage volumes for use with a single EC2 instance, not shared concurrent access across multiple instances in different Availability Zones. It requires provisioning and managing storage hardware, and does not offer a fully managed, scalable file system for shared access.
★ When this WOULD be the correct answer
A company runs a single EC2 instance that needs low-latency, persistent block storage for a database or transactional workload. The question specifies a single instance and requires high performance and durability, with no need for multi-instance shared access.
Why candidates choose this
Candidates may confuse EBS with a shared file system because it is a common storage option for EC2, and they might overlook the requirement for concurrent access across multiple instances and Availability Zones.
✗Amazon Simple Storage Service (S3)Wrong answer — click to see why▾
Why this is wrong here
Amazon S3 is an object storage service, not a file system. It does not provide a POSIX-compliant file system interface or support concurrent file-level locking, making it unsuitable for applications that require shared, consistent access to configuration files and static assets across multiple EC2 instances.
★ When this WOULD be the correct answer
A company needs to store and serve large amounts of static assets (e.g., images, videos) for a web application with high scalability and durability, and the application can access objects via HTTP APIs. The question would specify that the assets are accessed via URLs and do not require file system semantics.
Why candidates choose this
Candidates may confuse S3's scalability and shared access capabilities with file storage, overlooking that S3 is object-based and lacks the file system features (like locking and hierarchical directories) needed for concurrent file sharing across instances.
✗Amazon Relational Database Service (RDS)Wrong answer — click to see why▾
Why this is wrong here
Amazon RDS is a managed relational database service, not a file storage solution. It cannot be used to share configuration files and static assets across EC2 instances as a shared file system.
★ When this WOULD be the correct answer
A company needs a fully managed relational database with automated backups, patching, and replication across multiple Availability Zones for a web application's transactional data. The question would specify requirements for structured data with SQL queries and ACID compliance.
Why candidates choose this
Candidates may confuse 'managed service' with file storage, or think RDS can store any type of data because it is a database, overlooking that it is designed for structured data, not file sharing.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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 |
Go deeper
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About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.