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Security and Compliance →hardMultiple ChoiceObjective-mapped

DOP-C02 Security and Compliance Practice Question

This DOP-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 has a CloudFormation stack that creates an S3 bucket and an EC2 instance. The bucket policy must be updated to grant the EC2 instance read access. The DevOps engineer uses a custom resource backed by a Lambda function. However, the stack update fails because the Lambda function does not have permissions to update the bucket policy. What should the engineer do to resolve this issue while following security best practices?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

A
Modify the custom resource to use the EC2 instance profile instead of a Lambda function.
Why wrong: Using the EC2 instance profile is not a standard method for custom resources; moreover, the instance profile would still need permissions to update the bucket policy, which is not addressed.
B
Add an inline policy to the Lambda execution role that allows s3:PutBucketPolicy and ensure the bucket policy allows the EC2 instance role.
Why wrong: Option B adds the s3:PutBucketPolicy permission to the Lambda role but does not explicitly add the bucket policy; it only ensures it allows the EC2 instance role, which may not exist. The correct approach requires both the Lambda permission and the explicit creation of the bucket policy.
C
Attach a policy to the EC2 instance role that allows s3:GetObject on the bucket.
Why wrong: This only grants the EC2 instance read access but does not resolve the Lambda function's permission issue to update the bucket policy.
D
Update the Lambda execution role to include s3:PutBucketPolicy and add a bucket policy that grants s3:GetObject to the EC2 instance role.
This correctly updates the Lambda execution role to allow s3:PutBucketPolicy and adds a bucket policy granting the EC2 instance read access, resolving both issues.

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

✓

Update the Lambda execution role to include s3:PutBucketPolicy and add a bucket policy that grants s3:GetObject to the EC2 instance role.

Option A is incorrect because custom resources in CloudFormation require a Lambda function or other supported backend; using the EC2 instance profile directly is not a valid approach. Option B is incorrect because while adding an inline policy to the Lambda execution role for s3:PutBucketPolicy is necessary, it does not address the bucket policy that must grant s3:GetObject to the EC2 instance role. Option C is incorrect because the Lambda function itself needs the s3:PutBucketPolicy permission, not the EC2 instance. Option D is correct because it both updates the Lambda execution role to include the required permission and adds a bucket policy to allow the EC2 instance role read access.

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.

✗
Modify the custom resource to use the EC2 instance profile instead of a Lambda function.
Why it's wrong here
Using the EC2 instance profile is not a standard method for custom resources; moreover, the instance profile would still need permissions to update the bucket policy, which is not addressed.
✗
Add an inline policy to the Lambda execution role that allows s3:PutBucketPolicy and ensure the bucket policy allows the EC2 instance role.
Why it's wrong here
Option B adds the s3:PutBucketPolicy permission to the Lambda role but does not explicitly add the bucket policy; it only ensures it allows the EC2 instance role, which may not exist. The correct approach requires both the Lambda permission and the explicit creation of the bucket policy.
✗
Attach a policy to the EC2 instance role that allows s3:GetObject on the bucket.
Why it's wrong here
This only grants the EC2 instance read access but does not resolve the Lambda function's permission issue to update the bucket policy.
✓
Update the Lambda execution role to include s3:PutBucketPolicy and add a bucket policy that grants s3:GetObject to the EC2 instance role.
Why this is correct
This correctly updates the Lambda execution role to allow s3:PutBucketPolicy and adds a bucket policy granting the EC2 instance read access, resolving both issues.
Clue confirmation
The clue word "best" in the question point toward this answer.
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.

Visual reference

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 DOP-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.

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FAQ

Questions learners often ask

What does this DOP-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: Update the Lambda execution role to include s3:PutBucketPolicy and add a bucket policy that grants s3:GetObject to the EC2 instance role. — Option A is incorrect because custom resources in CloudFormation require a Lambda function or other supported backend; using the EC2 instance profile directly is not a valid approach. Option B is incorrect because while adding an inline policy to the Lambda execution role for s3:PutBucketPolicy is necessary, it does not address the bucket policy that must grant s3:GetObject to the EC2 instance role. Option C is incorrect because the Lambda function itself needs the s3:PutBucketPolicy permission, not the EC2 instance. Option D is correct because it both updates the Lambda execution role to include the required permission and adds a bucket policy to allow the EC2 instance role read access.

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

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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