← DOP-C02·Amazon Web Services

Question 869 of 1,750

Configuration Management and IaC →mediumMultiple ChoiceObjective-mapped

Best Practice: Store DB Password in Secrets Manager, Not User Data

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 CloudFormation to manage its infrastructure. The DevOps team has a template that creates an Amazon RDS DB instance and an EC2 instance that runs a web application. The EC2 instance needs to connect to the RDS instance using the database endpoint and password. The team currently passes the endpoint and password as CloudFormation parameters, which are then stored in the EC2 instance's user data. However, security audit has flagged this as a security risk because the password is visible in the user data. The team wants to securely pass the database credentials to the EC2 instance without exposing them in the template or user data. The EC2 instance has an IAM role that allows it to read from AWS Secrets Manager. Which solution should the team implement?

A
Store the password in AWS Systems Manager Parameter Store as a SecureString and have the EC2 instance retrieve it using the AWS CLI.
Why wrong: While more secure than plaintext, Parameter Store does not have built-in rotation and dynamic references in CloudFormation are not as seamless as Secrets Manager.
B
Encrypt the user data using AWS KMS and decrypt it on the EC2 instance at boot time.
Why wrong: The encrypted user data still contains the password in the template, and the decryption key may be exposed.
C
Store the password in AWS Secrets Manager, use a dynamic reference to pass it to the EC2 instance's IAM role, and have the application retrieve it from Secrets Manager at runtime.
This ensures the password is never stored in plaintext in the template or on the instance.
D
Use CloudFormation's Fn::GetAtt to retrieve the password from the RDS instance and pass it to the EC2 instance via user data.
Why wrong: Fn::GetAtt on RDS returns the master password only if it's a managed secret, but it would still be in user data.

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

✓

Store the password in AWS Secrets Manager, use a dynamic reference to pass it to the EC2 instance's IAM role, and have the application retrieve it from Secrets Manager at runtime.

Option C is correct. By storing the password in AWS Secrets Manager and using a dynamic reference in CloudFormation, the password is never exposed in the template or user data. The EC2 instance retrieves the password from Secrets Manager at runtime using its IAM role. Option A is not the best because although Parameter Store can store SecureStrings, Secrets Manager is more secure and supports automatic rotation, and the instance already has permissions to read Secrets Manager. Option B is risky because encrypting user data still exposes the password in the user data itself and adds key management complexity. Option D is wrong because Fn::GetAtt cannot retrieve the RDS master password, and even if it could, the password would still be passed via user data, which is insecure.

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.

✗
Store the password in AWS Systems Manager Parameter Store as a SecureString and have the EC2 instance retrieve it using the AWS CLI.
Why it's wrong here
While more secure than plaintext, Parameter Store does not have built-in rotation and dynamic references in CloudFormation are not as seamless as Secrets Manager.
✗
Encrypt the user data using AWS KMS and decrypt it on the EC2 instance at boot time.
Why it's wrong here
The encrypted user data still contains the password in the template, and the decryption key may be exposed.
✓
Store the password in AWS Secrets Manager, use a dynamic reference to pass it to the EC2 instance's IAM role, and have the application retrieve it from Secrets Manager at runtime.
Why this is correct
This ensures the password is never stored in plaintext in the template or on the instance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use CloudFormation's Fn::GetAtt to retrieve the password from the RDS instance and pass it to the EC2 instance via user data.
Why it's wrong here
Fn::GetAtt on RDS returns the master password only if it's a managed secret, but it would still be in user data.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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?

Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Store the password in AWS Secrets Manager, use a dynamic reference to pass it to the EC2 instance's IAM role, and have the application retrieve it from Secrets Manager at runtime. — Option C is correct. By storing the password in AWS Secrets Manager and using a dynamic reference in CloudFormation, the password is never exposed in the template or user data. The EC2 instance retrieves the password from Secrets Manager at runtime using its IAM role. Option A is not the best because although Parameter Store can store SecureStrings, Secrets Manager is more secure and supports automatic rotation, and the instance already has permissions to read Secrets Manager. Option B is risky because encrypting user data still exposes the password in the user data itself and adds key management complexity. Option D is wrong because Fn::GetAtt cannot retrieve the RDS master password, and even if it could, the password would still be passed via user data, which is insecure.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DOP-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 DOP-C02 exam.