DBS-C01 Workload-Specific Database Design Practice Question
This DBS-C01 practice question tests your understanding of workload-specific database design. 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.
Network Topology
Refer to the exhibit. A CloudFormation stack was deployed to create an RDS instance. The application team reports they cannot connect to the database using the endpoint provided. The security group allows inbound traffic on port 3306 from the application's security group. What is the most likely cause?
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.
Network Topology
A
The RDS instance is in a Multi-AZ deployment and the endpoint is for the standby
Why wrong: Multi-AZ uses the same endpoint; failover is transparent.
B
The security group inbound rule is missing the port 3306
Why wrong: The stem says the security group allows inbound on 3306.
C
The database password is not provided in the stack outputs; the team may be using the wrong password
The password is not output; they likely need to retrieve it from Secrets Manager.
D
The RDS endpoint is incorrect; it should include the port number
Why wrong: The endpoint alone is sufficient; the client can use default port.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The database password is not provided in the stack outputs; the team may be using the wrong password
Option C is correct because the CloudFormation stack outputs typically do not include the database password for security reasons. The application team may be using an incorrect password, which would cause authentication failures even if the network connectivity and security group rules are properly configured. Without the correct password, the RDS instance will reject the connection attempt at the MySQL/MariaDB protocol level.
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.
✗
The RDS instance is in a Multi-AZ deployment and the endpoint is for the standby
Why it's wrong here
Multi-AZ uses the same endpoint; failover is transparent.
✗
The security group inbound rule is missing the port 3306
Why it's wrong here
The stem says the security group allows inbound on 3306.
✓
The database password is not provided in the stack outputs; the team may be using the wrong password
Why this is correct
The password is not output; they likely need to retrieve it from Secrets Manager.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The RDS endpoint is incorrect; it should include the port number
Why it's wrong here
The endpoint alone is sufficient; the client can use default port.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on network connectivity issues (security groups, endpoints) and overlook the fact that authentication credentials are not automatically provided in stack outputs, leading them to choose options like B or D instead of recognizing the password mismatch as the root cause.
Detailed technical explanation
How to think about this question
When an RDS instance is created via CloudFormation, the database password is typically passed as a parameter or generated using Secrets Manager, but it is not exposed in the stack outputs to prevent accidental disclosure. The application must retrieve the password from a secure source (e.g., AWS Secrets Manager, SSM Parameter Store) or use the 'MasterUsername' and 'MasterUserPassword' properties defined in the template. A common real-world scenario is that the team hardcodes a placeholder password or uses a different secret than the one assigned during stack creation, leading to authentication failures despite correct network configuration.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Workload-Specific Database Design — This question tests Workload-Specific Database Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The database password is not provided in the stack outputs; the team may be using the wrong password — Option C is correct because the CloudFormation stack outputs typically do not include the database password for security reasons. The application team may be using an incorrect password, which would cause authentication failures even if the network connectivity and security group rules are properly configured. Without the correct password, the RDS instance will reject the connection attempt at the MySQL/MariaDB protocol level.
What should I do if I get this DBS-C01 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: "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?
Read the scenario before looking for a memorised answer.
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