- A
Enable S3 Access Analyzer on the bucket to generate findings for the auditor.
Why wrong: Access Analyzer only identifies potential access issues; it does not grant access.
- B
Create a cross-account IAM role in the company's account and share the role ARN with the auditor.
Why wrong: The auditor does not have an AWS account to assume the role.
- C
Use AWS STS to issue temporary credentials that the auditor can use to access the bucket.
STS can issue temporary credentials with a specified expiration; the auditor can use these to access the bucket.
- D
Generate a pre-signed URL for each log file the auditor needs to access.
Pre-signed URLs provide time-limited access to specific objects without requiring AWS credentials.
- E
Configure the bucket policy to grant access to 'Principal': '*' with a condition that limits access to the auditor's IP address.
Why wrong: This would make the bucket public; not recommended for sensitive logs.
SCS-C02 Identity and Access Management Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 security engineer is designing a solution to allow an external auditor to access logs in an S3 bucket in the company's AWS account. The auditor does not have an AWS account. The engineer needs to grant read-only access to the specific bucket for a limited time. Which TWO actions should the engineer take? (Choose two.)
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
Use AWS STS to issue temporary credentials that the auditor can use to access the bucket.
Option C is correct because AWS Security Token Service (STS) can issue temporary, limited-privilege credentials (access key, secret key, and session token) that the auditor can use to authenticate API requests to the S3 bucket. This approach does not require the auditor to have an AWS account and allows the engineer to control the validity period (via the DurationSeconds parameter) to enforce a limited time window. Option D is correct because a pre-signed URL embeds temporary credentials and a specific expiration time, granting read-only access to a single object without requiring the auditor to have AWS credentials or an AWS account.
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.
- ✗
Enable S3 Access Analyzer on the bucket to generate findings for the auditor.
Why it's wrong here
Access Analyzer only identifies potential access issues; it does not grant access.
- ✗
Create a cross-account IAM role in the company's account and share the role ARN with the auditor.
Why it's wrong here
The auditor does not have an AWS account to assume the role.
- ✓
Use AWS STS to issue temporary credentials that the auditor can use to access the bucket.
Why this is correct
STS can issue temporary credentials with a specified expiration; the auditor can use these to access the bucket.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Generate a pre-signed URL for each log file the auditor needs to access.
Why this is correct
Pre-signed URLs provide time-limited access to specific objects without requiring AWS credentials.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure the bucket policy to grant access to 'Principal': '*' with a condition that limits access to the auditor's IP address.
Why it's wrong here
This would make the bucket public; not recommended for sensitive logs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose cross-account IAM roles (Option B) without realizing that the external user must have an AWS account to assume the role, which is explicitly not the case in this scenario.
Detailed technical explanation
How to think about this question
Pre-signed URLs are generated using the AWS Signature Version 4 signing process, where the engineer signs a URL with their own IAM credentials and specifies an expiration time (up to 7 days by default, configurable via the ExpiresIn parameter). The auditor can use the pre-signed URL with any HTTP client (e.g., curl, browser) to perform a GET request without needing AWS credentials. For STS temporary credentials, the engineer calls AssumeRole (or GetFederationToken) to obtain credentials with a configurable expiration (up to 12 hours for IAM roles, up to 36 hours for federation tokens), which are then securely shared with the auditor for programmatic access via the AWS CLI or SDK.
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.
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 |
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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FAQ
Questions learners often ask
What does this SCS-C02 question test?
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: Use AWS STS to issue temporary credentials that the auditor can use to access the bucket. — Option C is correct because AWS Security Token Service (STS) can issue temporary, limited-privilege credentials (access key, secret key, and session token) that the auditor can use to authenticate API requests to the S3 bucket. This approach does not require the auditor to have an AWS account and allows the engineer to control the validity period (via the DurationSeconds parameter) to enforce a limited time window. Option D is correct because a pre-signed URL embeds temporary credentials and a specific expiration time, granting read-only access to a single object without requiring the auditor to have AWS credentials or an AWS account.
What should I do if I get this SCS-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
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