The answer is that the CLI is using HTTP instead of HTTPS. This is correct because the IAM policy includes a Deny statement with the condition `aws:SecureTransport` set to false, which explicitly blocks any request that does not use HTTPS encryption. Even though the user has the `s3:PutObject` permission, the Deny statement overrides it, causing the upload to fail when the AWS CLI is configured to communicate over HTTP rather than HTTPS. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how IAM policy evaluation logic works, particularly that an explicit Deny always wins over an Allow, and how the `aws:SecureTransport` condition key enforces encrypted transport. A common trap is assuming the issue is missing permissions or bucket policies, but the real culprit is the transport protocol. Memory tip: think "Deny on HTTP = Upload No-Go" to remember that a `SecureTransport` false condition blocks unencrypted requests.
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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.
Refer to the exhibit. An IAM policy is attached to a user. The user reports that they cannot upload objects to the S3 bucket 'example-bucket' using the AWS CLI from a remote location. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CLI is using HTTP instead of HTTPS.
Option B is correct. The Deny statement with condition aws:SecureTransport false blocks requests that are not using HTTPS. If the CLI is not configured to use HTTPS, the request will be denied. Option A is wrong because the user has s3:PutObject permission. Option C is wrong because there is no encryption requirement. Option D is wrong because there is no bucket policy blocking. Option E is wrong because the user has permission to upload.
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 clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The bucket policy denies access.
Why it's wrong here
The exhibit shows an IAM policy, not a bucket policy.
✗
The bucket requires server-side encryption.
Why it's wrong here
There is no encryption requirement in the policy.
✗
The user is not authorized to upload to the bucket.
Why it's wrong here
The user has permission.
✗
The user does not have s3:PutObject permission.
Why it's wrong here
The policy allows s3:PutObject.
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.
Trap categories for this question
Command / output trap
The exhibit shows an IAM policy, not a bucket policy.
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.
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.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The CLI is using HTTP instead of HTTPS. — Option B is correct. The Deny statement with condition aws:SecureTransport false blocks requests that are not using HTTPS. If the CLI is not configured to use HTTPS, the request will be denied. Option A is wrong because the user has s3:PutObject permission. Option C is wrong because there is no encryption requirement. Option D is wrong because there is no bucket policy blocking. Option E is wrong because the user has permission to upload.
What should I do if I get this SCS-C02 question wrong?
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.
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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