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Question 825 of 1,616

Security →hardMultiple ChoiceObjective-mapped

DVA-C02 Security Practice Question

This DVA-C02 practice question tests your understanding of security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 IAM policy that allows access to an S3 bucket only if the request comes from a specific VPC endpoint. The developer notices that requests from an EC2 instance in that VPC are being denied. What is the most likely cause?

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.

Question 1hardmultiple choice

Full question →

A
The VPC endpoint policy does not allow the required S3 action for the principal
VPC endpoint policies can restrict what actions are allowed through the endpoint. If the policy denies 's3:GetObject' for the role or user, access will be denied even if IAM and bucket policies allow it.
B
The bucket policy does not have a condition checking aws:SourceVpce
Why wrong: If the IAM policy already restricts to the VPC endpoint, the bucket policy may not need the condition. The denial is likely from the endpoint policy, not the absence of a condition.
C
The route table does not have a route to the S3 endpoint
Why wrong: Missing route would cause network connectivity failure (e.g., timeout), not an IAM authorization denial.
D
The security group does not allow outbound HTTPS traffic
Why wrong: Security groups control network traffic. If HTTPS is blocked, the request would time out, not return an access denied error.

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 VPC endpoint policy does not allow the required S3 action for the principal

The correct answer is A because the VPC endpoint policy is an additional layer of access control that can explicitly deny actions even if the bucket policy allows them. If the endpoint policy does not grant the required S3 action (e.g., s3:GetObject) for the IAM principal (the EC2 instance's role), requests will be denied regardless of the bucket policy. This is a common misconfiguration where developers focus only on the bucket policy and overlook the endpoint policy.

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.

✓
The VPC endpoint policy does not allow the required S3 action for the principal
Why this is correct
VPC endpoint policies can restrict what actions are allowed through the endpoint. If the policy denies 's3:GetObject' for the role or user, access will be denied even if IAM and bucket policies allow it.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The bucket policy does not have a condition checking aws:SourceVpce
Why it's wrong here
If the IAM policy already restricts to the VPC endpoint, the bucket policy may not need the condition. The denial is likely from the endpoint policy, not the absence of a condition.
✗
The route table does not have a route to the S3 endpoint
Why it's wrong here
Missing route would cause network connectivity failure (e.g., timeout), not an IAM authorization denial.
✗
The security group does not allow outbound HTTPS traffic
Why it's wrong here
Security groups control network traffic. If HTTPS is blocked, the request would time out, not return an access denied error.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume the bucket policy is the only control point and overlook the VPC endpoint policy, which acts as a separate authorization layer that can silently deny requests even when the bucket policy appears correct.

Detailed technical explanation

How to think about this question

VPC endpoint policies are written in JSON and evaluated separately from bucket policies; they can override bucket policy allowances by explicitly denying actions. For gateway endpoints (S3, DynamoDB), the endpoint policy is the first line of defense, and if it denies an action, the request fails with an AccessDenied error before the bucket policy is even checked. In practice, developers often forget to update the endpoint policy when adding new S3 actions, leading to mysterious denials.

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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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Security — This question tests Security — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The VPC endpoint policy does not allow the required S3 action for the principal — The correct answer is A because the VPC endpoint policy is an additional layer of access control that can explicitly deny actions even if the bucket policy allows them. If the endpoint policy does not grant the required S3 action (e.g., s3:GetObject) for the IAM principal (the EC2 instance's role), requests will be denied regardless of the bucket policy. This is a common misconfiguration where developers focus only on the bucket policy and overlook the endpoint policy.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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