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Data Operations and Support →easyMultiple ChoiceObjective-mapped

DEA-C01 Data Operations and Support Practice Question

This DEA-C01 practice question tests your understanding of data operations and support. 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 company uses Amazon CloudWatch Logs to collect application logs from EC2 instances. The logs are exported to Amazon S3 for long-term storage. Recently, the export task failed with the error 'Access Denied'. What is the most likely cause of this failure?

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 S3 bucket policy denies access from the CloudWatch Logs service.
Why wrong: While possible, the error is likely due to missing IAM permissions.
B
The IAM role does not have s3:PutObject permission on the destination bucket.
Without PutObject, the export task cannot write logs to S3.
C
The IAM role does not have s3:ListBucket permission.
Why wrong: Export only needs PutObject, not ListBucket.
D
The EC2 instances are in a VPC without a VPC endpoint for CloudWatch Logs.
Why wrong: VPC endpoint is for sending logs, not exporting.

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 IAM role does not have s3:PutObject permission on the destination bucket.

The export task from CloudWatch Logs to S3 uses an IAM role to write data to the destination bucket. If the role lacks the s3:PutObject permission, the S3 service will reject the request with an 'Access Denied' error. This is the most common cause because the export operation requires write access to the bucket.

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 S3 bucket policy denies access from the CloudWatch Logs service.
Why it's wrong here
While possible, the error is likely due to missing IAM permissions.
✓
The IAM role does not have s3:PutObject permission on the destination bucket.
Why this is correct
Without PutObject, the export task cannot write logs to S3.
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.
✗
The IAM role does not have s3:ListBucket permission.
Why it's wrong here
Export only needs PutObject, not ListBucket.
✗
The EC2 instances are in a VPC without a VPC endpoint for CloudWatch Logs.
Why it's wrong here
VPC endpoint is for sending logs, not exporting.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse the permissions needed for exporting logs to S3 (which requires s3:PutObject on the IAM role) with the permissions needed for sending logs from EC2 to CloudWatch Logs (which requires CloudWatch Logs agent permissions and possibly a VPC endpoint).

Detailed technical explanation

How to think about this question

The CloudWatch Logs export task uses a service-linked IAM role (or a custom role) to assume permissions for writing to S3. The role must have a trust policy allowing logs.amazonaws.com to assume it, and the S3 bucket policy must allow the role's principal to perform s3:PutObject. A common subtlety is that the bucket must also have a bucket policy that explicitly grants the CloudWatch Logs service principal access if the bucket uses a deny-not-allow default, but the primary failure point is the IAM role's permissions.

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 DEA-C01 question test?

Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The IAM role does not have s3:PutObject permission on the destination bucket. — The export task from CloudWatch Logs to S3 uses an IAM role to write data to the destination bucket. If the role lacks the s3:PutObject permission, the S3 service will reject the request with an 'Access Denied' error. This is the most common cause because the export operation requires write access to the bucket.

What should I do if I get this DEA-C01 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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