Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Amazon Elastic File System (EFS)
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.
B
Distractor review
Amazon Elastic Block Store (EBS)
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.
C
Distractor review
Amazon Simple Storage Service (S3)
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.
D
Distractor review
Amazon Relational Database Service (RDS)
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.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Amazon Elastic File System (EFS) — The scenario requires a shared file system that can be accessed concurrently by multiple EC2 instances across Availability Zones. Amazon EFS (Elastic File System) is a fully managed NFS file system that can be mounted on multiple EC2 instances simultaneously and is designed to be highly available and durable across AZs. It automatically scales storage capacity as files are added or removed. The other options are not suitable for this use case: Amazon EBS volumes can only be attached to a single EC2 instance in the same AZ (unless using Multi-Attach, which is limited and not designed for general-purpose shared access). Amazon S3 is an object storage service, not a file system, and does not support standard file locking or concurrent file-level access needed for NFS-like sharing. Amazon RDS is a relational database service and is not used for file storage.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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