The correct answer is to create an IAM role with read-only access and attach it to the EC2 instance profile. This approach is the most secure because it eliminates the need to store long-term AWS credentials—like access keys—directly on the instance, instead leveraging temporary security credentials that are automatically rotated by the AWS Security Token Service. When you need to grant an EC2 instance read-only access to an S3 bucket, using an IAM role for EC2 ensures that permissions are scoped to the instance’s identity rather than a static user, and the instance profile acts as a secure container for the role. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of the principle of least privilege and credential management; a common trap is assuming that storing keys in AWS Systems Manager Parameter Store is equally secure, but that still exposes credentials to the instance’s runtime environment. Memory tip: think “role, not keys” — if you see any option involving stored credentials, it’s automatically less secure than an instance profile.
SCS-C02 Identity and Access Management Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. 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 developer needs to grant an EC2 instance read-only access to an S3 bucket. Which of the following is the most secure way to provide these permissions?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an IAM role with read-only access and attach it to the EC2 instance profile.
Option B is correct because an IAM role attached to the EC2 instance via instance profile avoids long-term credentials. Option A is wrong because storing access keys on the instance is less secure. Option C is wrong because a bucket policy grants access to all principals, not just the instance. Option D is wrong because storing keys in SSM Parameter Store still exposes credentials to the instance.
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.
✗
Use an IAM role and store the credentials in AWS Systems Manager Parameter Store, then retrieve them at instance launch.
Why it's wrong here
Storing credentials in Parameter Store still exposes them to the instance.
✓
Create an IAM role with read-only access and attach it to the EC2 instance profile.
Why this is correct
IAM roles for EC2 provide temporary credentials without managing keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a bucket policy that grants read-only access to the instance's public IP address.
Why it's wrong here
Bucket policies based on IP are less secure and not recommended for EC2.
✗
Create an IAM user with read-only access and store the access keys in the instance's user data.
Why it's wrong here
Storing keys in user data is insecure; keys could be exposed.
Common exam traps
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.
Detailed technical explanation
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.
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 SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an IAM role with read-only access and attach it to the EC2 instance profile. — Option B is correct because an IAM role attached to the EC2 instance via instance profile avoids long-term credentials. Option A is wrong because storing access keys on the instance is less secure. Option C is wrong because a bucket policy grants access to all principals, not just the instance. Option D is wrong because storing keys in SSM Parameter Store still exposes credentials to the instance.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This SCS-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 SCS-C02 exam.
Question Discussion
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