The answer is that the application fails to set the x-amz-acl header to bucket-owner-full-control on PutObject requests. This is the most likely reason because the IAM policy explicitly includes the condition s3:x-amz-acl requiring that specific ACL value, and without it, the condition block evaluates to false, denying the write even though the Effect is Allow. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how IAM policy conditions interact with S3 API request headers—a common trap is assuming a valid resource ARN or a missing encryption key is the issue, when in fact the application simply omits the required header. Remember, when you see s3:x-amz-acl in a condition, the client must send that header with the exact value; otherwise, the request is silently denied. A useful memory tip: “If the policy demands an ACL header, your app must be a header bearer.”
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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.
A security engineer has attached the above IAM policy to a role used by an application to write logs to an S3 bucket. However, the application is unable to write logs. What is the MOST likely reason?
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 application does not set the x-amz-acl header to bucket-owner-full-control on PutObject requests.
Option A is correct because the policy requires the condition s3:x-amz-acl to be set to bucket-owner-full-control, but the application may not be setting that ACL. Option B is wrong because the resource ARN is correct for the specified path. Option C is wrong because the Effect is Allow. Option D is wrong because the policy does not mention encryption.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 Effect is set to Allow, which is too permissive.
Why it's wrong here
Allow is needed to grant access.
✓
The application does not set the x-amz-acl header to bucket-owner-full-control on PutObject requests.
Why this is correct
The condition requires the ACL to be set; without it, the request fails.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The policy does not allow server-side encryption.
Why it's wrong here
The policy does not mention encryption, but that is not required for writing logs.
✗
The resource ARN is incorrect; it should be arn:aws:s3:::my-log-bucket/*.
Why it's wrong here
The resource ARN is correct for the path AWSLogs/.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The application does not set the x-amz-acl header to bucket-owner-full-control on PutObject requests. — Option A is correct because the policy requires the condition s3:x-amz-acl to be set to bucket-owner-full-control, but the application may not be setting that ACL. Option B is wrong because the resource ARN is correct for the specified path. Option C is wrong because the Effect is Allow. Option D is wrong because the policy does not mention encryption.
What should I do if I get this SCS-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SCS-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SCS-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SCS-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.