← DVA-C02·Amazon Web Services

Question 1,168 of 1,616

Troubleshooting and Optimization →easyMultiple ChoiceObjective-mapped

DVA-C02 Troubleshooting and Optimization Practice Question

This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 developer is troubleshooting an AWS Lambda function that writes to an S3 bucket. The function is failing with an 'AccessDenied' error. The Lambda execution role has the following policy. What is the likely issue?

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [

"s3:PutObject", "s3:GetObject"

],
      "Resource": "arn:aws:s3:::my-bucket/*"
    }
  ]
}

A
The resource ARN should be 'arn:aws:s3:::my-bucket' instead of 'my-bucket/*'.
Why wrong: Incorrect. The resource ARN 'arn:aws:s3:::my-bucket/*' is correct for object-level operations like PutObject and GetObject. If the ARN were 'arn:aws:s3:::my-bucket', it would only grant bucket-level permissions.
B
The action should be 's3:PutObject' only, not 's3:GetObject'.
Why wrong: Incorrect. While the function may only need PutObject, having GetObject allowed does not cause an AccessDenied error. The error is not due to having extra actions.
C
The role is missing s3:ListBucket permission.
Why wrong: Incorrect. s3:ListBucket is not required for PutObject operations. The Permission denied is likely due to missing KMS permissions, not ListBucket.
D
The bucket uses SSE-KMS encryption, and the role lacks kms:Decrypt permission.
Correct. If the S3 bucket uses SSE-KMS encryption, the Lambda function needs kms:Decrypt (and possibly kms:GenerateDataKey) permissions to write objects. The lack of these causes AccessDenied.

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 uses SSE-KMS encryption, and the role lacks kms:Decrypt permission.

The policy in the Lambda execution role grants s3:PutObject and s3:GetObject permissions on objects in the bucket (objects matching `my-bucket/*`). However, if the S3 bucket uses SSE-KMS encryption, the Lambda function must also have kms:Decrypt permission to decrypt the object before writing or reading. Without this, the PutObject call will fail with an AccessDenied error because S3 cannot decrypt the object using KMS on behalf of the function. Option D correctly identifies the missing KMS permission. Option A is incorrect because the resource ARN `arn:aws:s3:::my-bucket/*` is correct for object-level operations like PutObject and GetObject. The bucket-level ARN would be for bucket-level operations (e.g., ListBucket), which are not required here. Option B is incorrect because the action list includes both PutObject and GetObject, which are both needed if the function also reads objects. Even if only PutObject is needed, having GetObject is not harmful and does not cause the error. Option C is incorrect because s3:ListBucket is not required for PutObject operations. PutObject only needs s3:PutObject on the object resource.

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 resource ARN should be 'arn:aws:s3:::my-bucket' instead of 'my-bucket/*'.
Why it's wrong here
Incorrect. The resource ARN 'arn:aws:s3:::my-bucket/*' is correct for object-level operations like PutObject and GetObject. If the ARN were 'arn:aws:s3:::my-bucket', it would only grant bucket-level permissions.
✗
The action should be 's3:PutObject' only, not 's3:GetObject'.
Why it's wrong here
Incorrect. While the function may only need PutObject, having GetObject allowed does not cause an AccessDenied error. The error is not due to having extra actions.
✗
The role is missing s3:ListBucket permission.
Why it's wrong here
Incorrect. s3:ListBucket is not required for PutObject operations. The Permission denied is likely due to missing KMS permissions, not ListBucket.
✓
The bucket uses SSE-KMS encryption, and the role lacks kms:Decrypt permission.
Why this is correct
Correct. If the S3 bucket uses SSE-KMS encryption, the Lambda function needs kms:Decrypt (and possibly kms:GenerateDataKey) permissions to write objects. The lack of these causes AccessDenied.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

Related DVA-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Development with AWS Services practice questions

Practise DVA-C02 questions linked to Development with AWS Services.

Security practice questions

Practise DVA-C02 questions linked to Security.

Deployment practice questions

Practise DVA-C02 questions linked to Deployment.

Troubleshooting and Optimization practice questions

Practise DVA-C02 questions linked to Troubleshooting and Optimization.

DVA-C02 fundamentals practice questions

Practise DVA-C02 questions linked to DVA-C02 fundamentals.

DVA-C02 scenario practice questions

Practise DVA-C02 questions linked to DVA-C02 scenario.

DVA-C02 troubleshooting practice questions

Practise DVA-C02 questions linked to DVA-C02 troubleshooting.

Practice this exam

Start a free DVA-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

DVA-C02 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this DVA-C02 question test?

Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The bucket uses SSE-KMS encryption, and the role lacks kms:Decrypt permission. — The policy in the Lambda execution role grants s3:PutObject and s3:GetObject permissions on objects in the bucket (objects matching `my-bucket/*`). However, if the S3 bucket uses SSE-KMS encryption, the Lambda function must also have kms:Decrypt permission to decrypt the object before writing or reading. Without this, the PutObject call will fail with an AccessDenied error because S3 cannot decrypt the object using KMS on behalf of the function. Option D correctly identifies the missing KMS permission. Option A is incorrect because the resource ARN `arn:aws:s3:::my-bucket/*` is correct for object-level operations like PutObject and GetObject. The bucket-level ARN would be for bucket-level operations (e.g., ListBucket), which are not required here. Option B is incorrect because the action list includes both PutObject and GetObject, which are both needed if the function also reads objects. Even if only PutObject is needed, having GetObject is not harmful and does not cause the error. Option C is incorrect because s3:ListBucket is not required for PutObject operations. PutObject only needs s3:PutObject on the object resource.

What should I do if I get this DVA-C02 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

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.

Loading comments…

This DVA-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 DVA-C02 exam.