The answer is denied because the explicit deny overrides any allow. In AWS S3 bucket policies, when an explicit deny statement is applied to a specific principal and action—such as s3:PutObject—it takes absolute precedence over any allow statement, even if those allows come from the same policy, a different policy, or an IAM user permission. This is a foundational principle of AWS IAM evaluation logic: explicit denies are final and cannot be overridden by any other permission. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of policy evaluation order and the critical difference between implicit and explicit denies. A common trap is assuming that a broader allow can rescue a user from a targeted deny, but the exam expects you to recognize that an explicit deny is a hard block. Remember the memory tip: “Explicit deny is the final word—no allow can be heard.”
SSCP Access Controls Practice Question
This SSCP practice question tests your understanding of access controls. 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.
Exhibit
Refer to the exhibit. The following IAM policy is attached to a user:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::corporate-data/*"
},
{
"Effect": "Deny",
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::corporate-data/*"
}
]
}
Based on the exhibit, if the user attempts to upload (put) a file to the S3 bucket corporate-data, what is the result?
Refer to the exhibit. The following IAM policy is attached to a user:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::corporate-data/*"
},
{
"Effect": "Deny",
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::corporate-data/*"
}
]
}
A
Allowed because the bucket policy likely allows public puts
Why wrong: The bucket policy is not shown; this is speculation and not supported by the exhibit.
B
Denied because the explicit deny overrides any allow
The explicit deny for PutObject overrides any potential allows, so the request is denied.
C
Denied because PutObject is not explicitly allowed
Why wrong: While true, the presence of an explicit deny is the definitive reason; however, the answer choice with explicit deny is more precise.
D
Allowed because the policy also allows GetObject
Why wrong: GetObject is read-only; PutObject is not allowed by the allow statement.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Denied because the explicit deny overrides any allow
The correct answer is B because the bucket policy includes an explicit deny statement that denies s3:PutObject for the user's principal. In AWS IAM and resource-based policies, an explicit deny always overrides any allow, regardless of other permissions. Therefore, even if other statements allow PutObject, the explicit deny blocks the upload.
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.
✗
Allowed because the bucket policy likely allows public puts
Why it's wrong here
The bucket policy is not shown; this is speculation and not supported by the exhibit.
✓
Denied because the explicit deny overrides any allow
Why this is correct
The explicit deny for PutObject overrides any potential allows, so the request is denied.
Related concept
Read the scenario before looking for a memorised answer.
✗
Denied because PutObject is not explicitly allowed
Why it's wrong here
While true, the presence of an explicit deny is the definitive reason; however, the answer choice with explicit deny is more precise.
✗
Allowed because the policy also allows GetObject
Why it's wrong here
GetObject is read-only; PutObject is not allowed by the allow statement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume an explicit allow for PutObject would override a deny, but AWS's explicit deny always wins, making the presence of any deny statement the decisive factor.
Trap categories for this question
Command / output trap
The bucket policy is not shown; this is speculation and not supported by the exhibit.
Detailed technical explanation
How to think about this question
AWS IAM policy evaluation logic follows a default deny, then explicit allow, then explicit deny—where explicit deny is final. This is documented in the AWS IAM policy evaluation model. In real-world scenarios, a common misconfiguration is adding a broad deny (e.g., for all actions) that inadvertently blocks legitimate operations, requiring careful policy structuring with NotAction or condition keys.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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.
Access Controls — This question tests Access Controls — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Denied because the explicit deny overrides any allow — The correct answer is B because the bucket policy includes an explicit deny statement that denies s3:PutObject for the user's principal. In AWS IAM and resource-based policies, an explicit deny always overrides any allow, regardless of other permissions. Therefore, even if other statements allow PutObject, the explicit deny blocks the upload.
What should I do if I get this SSCP 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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Question Discussion
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