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SDLC Automation →mediumMultiple ChoiceObjective-mapped

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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 CloudFormation to manage infrastructure. They have a stack that creates an Amazon RDS instance. The stack creation fails with the error: 'The following resource(s) failed to create: [DBInstance]'. The CloudFormation template includes a parameter for the DB instance class. Which troubleshooting step should be taken FIRST?

Clue words in this question

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

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
Increase the stack creation timeout to allow more time for the database to be created.
Why wrong: Timeout is not the issue if the error is immediate.
B
Check the CloudFormation stack events for a detailed status message from the DBInstance resource.
Stack events provide the specific reason for failure, such as 'DBInstance class not supported'.
C
Verify that the VPC has at least two public subnets in different Availability Zones.
Why wrong: RDS does not require public subnets; it can be in private subnets.
D
Use the Amazon RDS console to check if a DB instance with the same identifier already exists.
Why wrong: While possible, the stack events are more immediate and specific.

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

✓

Check the CloudFormation stack events for a detailed status message from the DBInstance resource.

The first step when a CloudFormation stack creation fails is to check the stack events in the CloudFormation console or via the AWS CLI. Each resource creation attempt generates a status message that includes a detailed reason for the failure, such as insufficient capacity, incorrect parameter values, or network configuration issues. For an RDS DBInstance, the event message will provide the specific error (e.g., 'DB instance class not supported in this Availability Zone'), enabling targeted troubleshooting without guesswork.

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.

✗
Increase the stack creation timeout to allow more time for the database to be created.
Why it's wrong here
Timeout is not the issue if the error is immediate.
✓
Check the CloudFormation stack events for a detailed status message from the DBInstance resource.
Why this is correct
Stack events provide the specific reason for failure, such as 'DBInstance class not supported'.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Verify that the VPC has at least two public subnets in different Availability Zones.
Why it's wrong here
RDS does not require public subnets; it can be in private subnets.
✗
Use the Amazon RDS console to check if a DB instance with the same identifier already exists.
Why it's wrong here
While possible, the stack events are more immediate and specific.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates jump to common RDS prerequisites (like VPC subnets or duplicate identifiers) without first consulting the CloudFormation stack events, which provide the precise failure reason and are the standard diagnostic tool for any stack creation failure.

Detailed technical explanation

How to think about this question

CloudFormation stack events are stored in the CloudFormation service and can be retrieved via the `describe-stack-events` AWS CLI command or the console. Each event includes a `ResourceStatusReason` field that contains the exact error message from the AWS service (e.g., RDS) that attempted to create the resource. For RDS, common failure reasons include 'The DB instance class db.t2.micro is not supported in the VPC' or 'The parameter group does not exist', which directly guide the next corrective action.

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

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

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 DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Check the CloudFormation stack events for a detailed status message from the DBInstance resource. — The first step when a CloudFormation stack creation fails is to check the stack events in the CloudFormation console or via the AWS CLI. Each resource creation attempt generates a status message that includes a detailed reason for the failure, such as insufficient capacity, incorrect parameter values, or network configuration issues. For an RDS DBInstance, the event message will provide the specific error (e.g., 'DB instance class not supported in this Availability Zone'), enabling targeted troubleshooting without guesswork.

What should I do if I get this DOP-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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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