- A
The parameter group name in the template has a typo or does not match the actual resource name.
Why wrong: A typo or name mismatch would result in a different error (e.g., 'parameter group not found'), and the administrator verified the parameter group exists. Therefore, this is not the most likely issue.
- B
The VPC security group specified for the DB instance does not allow inbound traffic from the application tier.
Why wrong: The error message is specifically about the parameter group not existing, not about security group inbound rules. Therefore, this is incorrect.
- C
The DB instance class requires a different parameter group family.
Why wrong: The DB instance class does not affect parameter group existence; a family mismatch would be a separate validation error. Thus, this is not the likely cause.
- D
The parameter group resource is defined in the same template but is not linked to the DB instance using the 'DependsOn' attribute.
Without the 'DependsOn' attribute, CloudFormation may attempt to create the DB instance before the parameter group, causing the creation to fail since the parameter group does not exist yet. This is the most likely issue.
CloudFormation DependsOn for RDS Parameter Group Ordering
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: cloudFormation DependsOn. 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 SysOps administrator is troubleshooting a CloudFormation stack creation failure. The stack is designed to create an Amazon RDS DB instance with a specific parameter group. The error message indicates that the DB instance could not be created because the parameter group does not exist. The administrator has verified that the parameter group exists in the same region and account. What is the MOST likely issue?
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.
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 parameter group resource is defined in the same template but is not linked to the DB instance using the 'DependsOn' attribute.
Option D is correct because the error 'parameter group does not exist' can occur when the parameter group is defined in the same CloudFormation template but is not explicitly linked to the DB instance via the 'DependsOn' attribute. Without DependsOn, CloudFormation may attempt to create the DB instance before the parameter group, causing the creation to fail since the parameter group hasn't been created yet. Option A is incorrect because a typo or name mismatch would result in a different error (e.g., 'parameter group not found') and the administrator verified the parameter group exists in the same region and account. Option B is incorrect because the error message is about the parameter group, not security groups. Option C is incorrect because the DB instance class does not affect parameter group existence; a family mismatch would be a separate validation error.
Key principle: CloudFormation DependsOn
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 parameter group name in the template has a typo or does not match the actual resource name.
Why it's wrong here
A typo or name mismatch would result in a different error (e.g., 'parameter group not found'), and the administrator verified the parameter group exists. Therefore, this is not the most likely issue.
- ✗
The VPC security group specified for the DB instance does not allow inbound traffic from the application tier.
Why it's wrong here
The error message is specifically about the parameter group not existing, not about security group inbound rules. Therefore, this is incorrect.
- ✗
The DB instance class requires a different parameter group family.
Why it's wrong here
The DB instance class does not affect parameter group existence; a family mismatch would be a separate validation error. Thus, this is not the likely cause.
- ✓
The parameter group resource is defined in the same template but is not linked to the DB instance using the 'DependsOn' attribute.
Why this is correct
Without the 'DependsOn' attribute, CloudFormation may attempt to create the DB instance before the parameter group, causing the creation to fail since the parameter group does not exist yet. This is the most likely issue.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CloudFormation DependsOn
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
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- CloudFormation DependsOn
- Resource creation order
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
CloudFormation DependsOn
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.
What to study next
Got this wrong? Here's your next step.
Review cloudFormation DependsOn, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — CloudFormation DependsOn.
What is the correct answer to this question?
The correct answer is: The parameter group resource is defined in the same template but is not linked to the DB instance using the 'DependsOn' attribute. — Option D is correct because the error 'parameter group does not exist' can occur when the parameter group is defined in the same CloudFormation template but is not explicitly linked to the DB instance via the 'DependsOn' attribute. Without DependsOn, CloudFormation may attempt to create the DB instance before the parameter group, causing the creation to fail since the parameter group hasn't been created yet. Option A is incorrect because a typo or name mismatch would result in a different error (e.g., 'parameter group not found') and the administrator verified the parameter group exists in the same region and account. Option B is incorrect because the error message is about the parameter group, not security groups. Option C is incorrect because the DB instance class does not affect parameter group existence; a family mismatch would be a separate validation error.
What should I do if I get this SOA-C02 question wrong?
Review cloudFormation DependsOn, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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?
CloudFormation DependsOn
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Last reviewed: Jun 20, 2026
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