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Management and Security Governance →mediumMultiple ChoiceObjective-mapped

SCS-C02 Management and Security Governance Practice Question

This SCS-C02 practice question tests your understanding of management and security governance. 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 company has an S3 bucket that stores sensitive data. The bucket policy allows access only from a specific VPC endpoint. The security engineer tests the configuration and finds that requests from the VPC endpoint are being denied. The bucket policy contains the following condition: "Condition": { "StringEquals": { "aws:SourceVpce": "vpce-12345678" } }. The VPC endpoint ID is correct. The engineer also confirms that the VPC endpoint policy allows the necessary S3 actions. What is the most likely reason for the denial?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The request is not being routed through the VPC endpoint; the EC2 instance is using a public S3 endpoint.
If not using endpoint, the condition key is not present.
B
The EC2 instance does not have an IAM role that allows s3:GetObject.
Why wrong: The bucket policy should grant access regardless of IAM role.
C
The VPC endpoint is in a different region than the S3 bucket.
Why wrong: S3 supports cross-region VPC endpoints.
D
The condition key is misspelled; it should be aws:SourceVpce (no 'e' at the end).
Why wrong: Condition key is correct.

Full breakdown with real-world context →

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

✓

The request is not being routed through the VPC endpoint; the EC2 instance is using a public S3 endpoint.

The bucket policy condition aws:SourceVpce only appears in requests that are routed through the specified VPC endpoint. If the EC2 instance accesses S3 via the public internet (using the public S3 endpoint), the request does not include the condition key, and the condition fails, causing denial. Option A correctly identifies this misrouting. Options B, C, and D are not the primary cause: IAM roles are not the issue here because the bucket policy is denying based on the condition; cross-region access is allowed via endpoints; and the condition key is correctly spelled.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
The request is not being routed through the VPC endpoint; the EC2 instance is using a public S3 endpoint.
Why this is correct
If not using endpoint, the condition key is not present.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The EC2 instance does not have an IAM role that allows s3:GetObject.
Why it's wrong here
The bucket policy should grant access regardless of IAM role.
✗
The VPC endpoint is in a different region than the S3 bucket.
Why it's wrong here
S3 supports cross-region VPC endpoints.
✗
The condition key is misspelled; it should be aws:SourceVpce (no 'e' at the end).
Why it's wrong here
Condition key is correct.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this SCS-C02 question test?

Management and Security Governance — This question tests Management and Security Governance — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The request is not being routed through the VPC endpoint; the EC2 instance is using a public S3 endpoint. — The bucket policy condition aws:SourceVpce only appears in requests that are routed through the specified VPC endpoint. If the EC2 instance accesses S3 via the public internet (using the public S3 endpoint), the request does not include the condition key, and the condition fails, causing denial. Option A correctly identifies this misrouting. Options B, C, and D are not the primary cause: IAM roles are not the issue here because the bucket policy is denying based on the condition; cross-region access is allowed via endpoints; and the condition key is correctly spelled.

What should I do if I get this SCS-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Standard ACLs match source addresses.

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