← SOA-C02·Amazon Web Services

Question 985 of 1,546

Security and Compliance →hardMultiple ChoiceObjective-mapped

SOA-C02 Security and Compliance Practice Question

This SOA-C02 practice question tests your understanding of security and compliance. 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 company uses AWS CloudTrail to log all API calls. The security team requires that all logs be encrypted at rest and stored in an S3 bucket that blocks public access. The SysOps administrator configures the bucket with default encryption (SSE-S3) and a bucket policy that denies all actions unless the request includes the x-amz-server-side-encryption header with value AES256. However, CloudTrail delivery fails. 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.

A
The bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header
CloudTrail uses SSE-S3 automatically but does not set the header; the policy denies the request.
B
CloudTrail does not support SSE-S3 encryption
Why wrong: CloudTrail supports SSE-S3.
C
The bucket policy does not grant CloudTrail the s3:PutObject permission
Why wrong: CloudTrail uses a separate bucket policy to grant access.
D
The bucket has default encryption enabled, which conflicts with CloudTrail's encryption
Why wrong: Default encryption is compatible with CloudTrail.

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 bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header

CloudTrail does not include the x-amz-server-side-encryption header when delivering log files to S3. The bucket policy requires this header for all PutObject requests, so CloudTrail's PUT requests are denied, causing delivery to fail. SSE-S3 encryption is applied automatically by S3 when default encryption is enabled, but the policy condition overrides that by requiring the header explicitly.

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 bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header
Why this is correct
CloudTrail uses SSE-S3 automatically but does not set the header; the policy denies the request.
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.
✗
CloudTrail does not support SSE-S3 encryption
Why it's wrong here
CloudTrail supports SSE-S3.
✗
The bucket policy does not grant CloudTrail the s3:PutObject permission
Why it's wrong here
CloudTrail uses a separate bucket policy to grant access.
✗
The bucket has default encryption enabled, which conflicts with CloudTrail's encryption
Why it's wrong here
Default encryption is compatible with CloudTrail.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates assume default encryption automatically satisfies encryption requirements, but bucket policy conditions are evaluated before S3 applies default encryption, so the missing header still causes a denial.

Detailed technical explanation

How to think about this question

CloudTrail delivers log files using the S3 PutObject API without specifying any server-side encryption headers. When a bucket policy uses a condition like 'StringNotEquals' on s3:x-amz-server-side-encryption, it effectively requires the request to include that header with the exact value. Even with default encryption enabled, S3 applies encryption server-side after the request is evaluated, so the policy condition is evaluated before encryption is applied, causing the denial.

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.

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.

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 SOA-C02 question test?

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

What is the correct answer to this question?

The correct answer is: The bucket policy requires the x-amz-server-side-encryption header, but CloudTrail does not include this header — CloudTrail does not include the x-amz-server-side-encryption header when delivering log files to S3. The bucket policy requires this header for all PutObject requests, so CloudTrail's PUT requests are denied, causing delivery to fail. SSE-S3 encryption is applied automatically by S3 when default encryption is enabled, but the policy condition overrides that by requiring the header explicitly.

What should I do if I get this SOA-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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This SOA-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 SOA-C02 exam.