Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a web application on multiple Amazon EC2 instances across two Availability Zones. The application processes user-uploaded documents and must store them in a shared file system that all instances can access simultaneously. The file system must be scalable to petabytes, durable, and fully managed. Which AWS service should the company use to meet these requirements?
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
Distractor review
Amazon EBS with Multi-Attach enabled
Amazon EBS Multi-Attach allows a single EBS volume to be attached to up to 16 Nitro-based EC2 instances in the same Availability Zone. It does not support cross-AZ access, has limited scalability, and is not intended for petabyte-scale workloads. It is also not fully managed for scaling to petabytes.
B
Best answer
Amazon EFS
Amazon EFS provides a fully managed, elastic NFS file system that can be mounted on multiple EC2 instances across multiple Availability Zones. It scales automatically to petabytes, offers high durability, and is designed for concurrent access from thousands of instances. This matches all requirements.
C
Distractor review
Amazon S3
Amazon S3 is an object storage service, not a file system. While it can be accessed from multiple instances, it does not provide a POSIX-compliant file system interface. Applications expecting a shared file system with standard file operations (like locking or appends) would not work directly with S3.
D
Distractor review
Amazon EC2 Instance Store
Instance Store provides temporary block-level storage that is physically attached to the host computer. It is ephemeral (data is lost if the instance stops or terminates) and cannot be shared across multiple instances. It does not meet durability or shared access requirements.
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 EFS — Amazon EFS (Elastic File System) is a fully managed, scalable NFS file system that can be accessed concurrently from multiple EC2 instances across different Availability Zones. It automatically scales storage capacity up to petabytes, making it suitable for this scenario. Amazon EBS with Multi-Attach is limited to a small number of instances and specific use cases, not designed for petabyte-scale or cross-AZ access. Amazon S3 is an object storage service, not a POSIX-compliant file system. Amazon EC2 Instance Store provides temporary block-level storage that is ephemeral and not shared across instances.
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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