- A
Create an IAM user and embed the access key in the application code
Why wrong: Hardcoding access keys in application code is a major security risk. Keys can be leaked in code repositories, and they are long-term credentials that do not rotate automatically.
- B
Store the access key in an EC2 environment variable
Why wrong: Storing long-term access keys in environment variables on the instance still violates the requirement to avoid long-term credentials. Environment variables can be read by any process on the instance.
- C
Attach an IAM role to the EC2 instance
An IAM role attached to an EC2 instance (via an instance profile) provides temporary, automatically rotating credentials. The EC2 metadata service delivers these credentials to the application, eliminating the need to store any long-term access keys.
- D
Use an IAM group to assign the permissions to the EC2 instance
Why wrong: IAM groups are used to manage permissions for IAM users, not EC2 instances. EC2 instances cannot be members of IAM groups.
Quick Answer
The answer is to attach an IAM role to the EC2 instance. This is correct because an IAM role allows the instance to securely obtain temporary credentials from AWS Security Token Service (STS) via the instance metadata service, eliminating the need to store any long-term access keys on the instance itself. The temporary credentials are automatically rotated before they expire, providing secure, programmatic access to the S3 bucket. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding of IAM roles versus long-term access keys—a common trap is choosing to store keys in a configuration file or use an IAM user, which violates the security requirement. Remember the memory tip: “Role, not key, sets EC2 free”—if the question says “no long-term keys,” immediately think of an IAM role attached to the instance.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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.
An application running on an Amazon EC2 instance needs to access an Amazon S3 bucket. The security team requires that no long-term access keys be stored on the instance. Which IAM feature should be used to grant the EC2 instance permission to access S3?
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
Attach an IAM role to the EC2 instance
Option C is correct because an IAM role can be attached to an EC2 instance, allowing the instance to obtain temporary security credentials from AWS STS via the instance metadata service. This eliminates the need to store long-term access keys on the instance, satisfying the security team's requirement. The EC2 instance automatically rotates these temporary credentials before they expire, providing secure, programmatic access to the S3 bucket.
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.
- ✗
Create an IAM user and embed the access key in the application code
Why it's wrong here
Hardcoding access keys in application code is a major security risk. Keys can be leaked in code repositories, and they are long-term credentials that do not rotate automatically.
- ✗
Store the access key in an EC2 environment variable
Why it's wrong here
Storing long-term access keys in environment variables on the instance still violates the requirement to avoid long-term credentials. Environment variables can be read by any process on the instance.
- ✓
Attach an IAM role to the EC2 instance
Why this is correct
An IAM role attached to an EC2 instance (via an instance profile) provides temporary, automatically rotating credentials. The EC2 metadata service delivers these credentials to the application, eliminating the need to store any long-term access keys.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an IAM group to assign the permissions to the EC2 instance
Why it's wrong here
IAM groups are used to manage permissions for IAM users, not EC2 instances. EC2 instances cannot be members of IAM groups.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse IAM roles with IAM users or groups, thinking that any IAM entity can be attached to an EC2 instance, but only IAM roles support the temporary credential workflow required for secure, keyless access.
Detailed technical explanation
How to think about this question
When an IAM role is attached to an EC2 instance, the instance retrieves temporary credentials from the EC2 metadata service (169.254.169.254/latest/meta-data/iam/security-credentials/). These credentials are signed with AWS Signature Version 4 and are valid for a configurable duration (default 6 hours), after which the AWS SDK automatically refreshes them. This mechanism is fundamental to the principle of least privilege and is a core pattern for secure, automated access in AWS environments.
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.
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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Security and Compliance — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attach an IAM role to the EC2 instance — Option C is correct because an IAM role can be attached to an EC2 instance, allowing the instance to obtain temporary security credentials from AWS STS via the instance metadata service. This eliminates the need to store long-term access keys on the instance, satisfying the security team's requirement. The EC2 instance automatically rotates these temporary credentials before they expire, providing secure, programmatic access to the S3 bucket.
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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