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Identity and Access Management →hardMultiple ChoiceObjective-mapped

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 troubleshooting an issue where an IAM policy allows access to S3 but the user is denied access to a specific bucket. The policy has the following statement:

{
  "Effect": "Allow",
  "Action": "s3:*",
  "Resource": "*"
}

What is the most likely cause of 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 policy statement is too broad and AWS automatically denies access to specific buckets.
Why wrong: This is incorrect. AWS does not automatically deny access to specific buckets because a policy is broad. A broad allow policy grants access unless a deny exists elsewhere.
B
An explicit deny statement in a different policy (e.g., SCP, permissions boundary) is overriding the allow.
This is correct. An explicit deny in a service control policy (SCP), permissions boundary, or another IAM policy takes precedence over any allow, causing the denial.
C
The S3 bucket has a bucket policy that denies access to the user.
Why wrong: This is incorrect. A bucket policy with a deny could cause the denial, but it is not the most likely cause given the IAM allow and the troubleshooting context of IAM policies. The question asks for the most likely cause, which is an explicit deny in a different policy.
D
The policy is attached to the user but the user is assuming a role that does not have S3 permissions.
Why wrong: This is incorrect. Assuming a role would change the effective permissions, but there is no indication the user is assuming a role. The user's own policy is an allow, and role assumption is not mentioned.

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

✓

An explicit deny statement in a different policy (e.g., SCP, permissions boundary) is overriding the allow.

The correct answer is B because an explicit deny in a separate policy (e.g., service control policy, permissions boundary, or another IAM policy) overrides any allow. Even though the user's policy allows s3:* on all resources, an explicit deny for that specific bucket will deny access. Option A is incorrect because AWS does not automatically deny access to specific buckets based on broad policies. Option C is incorrect because the bucket policy could deny access, but that is not the 'most likely' cause given the IAM allow; an explicit deny in an SCP or permissions boundary is more common in troubleshooting. Option D is incorrect because assuming a role would replace the user's permissions, but the scenario does not indicate role assumption.

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 policy statement is too broad and AWS automatically denies access to specific buckets.
Why it's wrong here
This is incorrect. AWS does not automatically deny access to specific buckets because a policy is broad. A broad allow policy grants access unless a deny exists elsewhere.
✓
An explicit deny statement in a different policy (e.g., SCP, permissions boundary) is overriding the allow.
Why this is correct
This is correct. An explicit deny in a service control policy (SCP), permissions boundary, or another IAM policy takes precedence over any allow, causing the denial.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The S3 bucket has a bucket policy that denies access to the user.
Why it's wrong here
This is incorrect. A bucket policy with a deny could cause the denial, but it is not the most likely cause given the IAM allow and the troubleshooting context of IAM policies. The question asks for the most likely cause, which is an explicit deny in a different policy.
✗
The policy is attached to the user but the user is assuming a role that does not have S3 permissions.
Why it's wrong here
This is incorrect. Assuming a role would change the effective permissions, but there is no indication the user is assuming a role. The user's own policy is an allow, and role assumption is not mentioned.

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?

Identity and Access Management — This question tests Identity and Access Management — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: An explicit deny statement in a different policy (e.g., SCP, permissions boundary) is overriding the allow. — The correct answer is B because an explicit deny in a separate policy (e.g., service control policy, permissions boundary, or another IAM policy) overrides any allow. Even though the user's policy allows s3:* on all resources, an explicit deny for that specific bucket will deny access. Option A is incorrect because AWS does not automatically deny access to specific buckets based on broad policies. Option C is incorrect because the bucket policy could deny access, but that is not the 'most likely' cause given the IAM allow; an explicit deny in an SCP or permissions boundary is more common in troubleshooting. Option D is incorrect because assuming a role would replace the user's permissions, but the scenario does not indicate role assumption.

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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