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Question 635 of 1,750

Configuration Management and IaC →mediumMultiple ChoiceObjective-mapped

DOP-C02 Configuration Management and IaC Practice Question

This DOP-C02 practice question tests your understanding of configuration management and iac. 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 CodeCommit to store infrastructure as code templates. The DevOps team has set up an AWS CodePipeline that automatically deploys a CloudFormation stack when changes are pushed to the main branch. The pipeline includes a deployment action that uses the CloudFormation create/update stack action. Recently, a developer pushed a change that caused the CloudFormation stack update to fail because the change would have deleted a critical resource. The pipeline did not catch this issue, and the stack update failed midway, leaving the stack in a partially updated state. The team wants to implement a safety mechanism to prevent such issues in the future. Which solution should they implement?

A
Add a CloudFormation change set action in the pipeline with a manual approval step to review the changes before executing the stack update.
Change sets show what will be changed, allowing review before update.
B
Create a stack policy that denies deletion of critical resources, and include the policy in the CloudFormation template.
Why wrong: Stack policies prevent deletion but the update still proceeds and may fail on other resources.
C
Add a manual approval step before the deployment action to review the code change.
Why wrong: Reviewing code changes is not sufficient to catch resource deletion; a change set review is needed.
D
Add a 'Test' stage in the pipeline that deploys the stack to a test environment first.
Why wrong: Testing does not prevent the issue; it only helps catch it in a lower environment.

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

✓

Add a CloudFormation change set action in the pipeline with a manual approval step to review the changes before executing the stack update.

Option A is correct because adding a CloudFormation change set action with a manual approval step allows the team to review the exact changes that will be applied to the stack before execution. This prevents unintended modifications like resource deletions. Option B is incorrect because a stack policy can deny deletion of specific resources but does not prevent the update from starting or failing midway; it only blocks the deletion, and the update may still fail. Option C is incorrect because reviewing the code change alone is insufficient; the pipeline needs to see the infrastructure impact through a change set. Option D is incorrect because deploying to a test environment first helps find issues but does not provide a pre-execution review of the production stack changes; the question requires a safety mechanism to catch changes that would delete critical resources before they are applied.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Add a CloudFormation change set action in the pipeline with a manual approval step to review the changes before executing the stack update.
Why this is correct
Change sets show what will be changed, allowing review before update.
Related concept
Standard ACLs match source addresses.
✗
Create a stack policy that denies deletion of critical resources, and include the policy in the CloudFormation template.
Why it's wrong here
Stack policies prevent deletion but the update still proceeds and may fail on other resources.
✗
Add a manual approval step before the deployment action to review the code change.
Why it's wrong here
Reviewing code changes is not sufficient to catch resource deletion; a change set review is needed.
✗
Add a 'Test' stage in the pipeline that deploys the stack to a test environment first.
Why it's wrong here
Testing does not prevent the issue; it only helps catch it in a lower environment.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DOP-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Configuration Management and IaC — This question tests Configuration Management and IaC — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Add a CloudFormation change set action in the pipeline with a manual approval step to review the changes before executing the stack update. — Option A is correct because adding a CloudFormation change set action with a manual approval step allows the team to review the exact changes that will be applied to the stack before execution. This prevents unintended modifications like resource deletions. Option B is incorrect because a stack policy can deny deletion of specific resources but does not prevent the update from starting or failing midway; it only blocks the deletion, and the update may still fail. Option C is incorrect because reviewing the code change alone is insufficient; the pipeline needs to see the infrastructure impact through a change set. Option D is incorrect because deploying to a test environment first helps find issues but does not provide a pre-execution review of the production stack changes; the question requires a safety mechanism to catch changes that would delete critical resources before they are applied.

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

What is the key concept behind this question?

Standard ACLs match source addresses.

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