This DBS-C01 practice question tests your understanding of database security. 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 is migrating an on-premises Oracle database to Amazon RDS for Oracle. The compliance team requires that all database connections use SSL/TLS and that users authenticate using IAM database authentication. The database migration is completed, but the application team reports that connections using IAM authentication are failing. The company has already enabled IAM database authentication on the RDS instance. What is the most likely cause of the failure?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The database user has not been granted the necessary privileges for IAM authentication.
Option C is correct because IAM database authentication requires that the database user be created with the `IDENTIFIED WITH AWS_AUTHENTICATION` clause in Oracle. Without this privilege, the RDS instance will reject IAM-authenticated connections even if IAM authentication is enabled at the instance level. The application team must ensure the database user has been granted the `AWS_ORACLE_EXTENSIONS` role and that the user is mapped to an IAM policy allowing `rds-db:connect`.
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The application is using an outdated root CA certificate for SSL.
Why it's wrong here
While SSL is required, the error is specific to authentication, not SSL handshake.
✗
The Security Group does not allow inbound traffic from the application.
Why it's wrong here
Network connectivity would cause a timeout, not an authentication error.
✓
The database user has not been granted the necessary privileges for IAM authentication.
Why this is correct
Database users must be created with 'IDENTIFIED WITH AWS_AUTHENTICATION' and granted 'rds_iam' role to use IAM authentication.
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 instance is using a different KMS key for encryption.
Why it's wrong here
KMS keys are unrelated to IAM database authentication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume enabling IAM authentication on the RDS instance is sufficient, overlooking the mandatory step of creating the database user with the `IDENTIFIED WITH AWS_AUTHENTICATION` clause and granting the necessary privileges.
Detailed technical explanation
How to think about this question
IAM database authentication for RDS Oracle uses a token generated via the AWS CLI or SDK with `rds-db:connect` permissions. The token is passed as the password, and the database user must be created with `IDENTIFIED WITH AWS_AUTHENTICATION` to accept it. Under the hood, RDS validates the token's signature using the IAM service and maps it to the local database user, which requires the `AWS_ORACLE_EXTENSIONS` role to be granted to the user. A common pitfall is enabling IAM authentication at the instance level but forgetting to create the database user with the correct authentication clause.
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.
Database Security — This question tests Database Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The database user has not been granted the necessary privileges for IAM authentication. — Option C is correct because IAM database authentication requires that the database user be created with the `IDENTIFIED WITH AWS_AUTHENTICATION` clause in Oracle. Without this privilege, the RDS instance will reject IAM-authenticated connections even if IAM authentication is enabled at the instance level. The application team must ensure the database user has been granted the `AWS_ORACLE_EXTENSIONS` role and that the user is mapped to an IAM policy allowing `rds-db:connect`.
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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Question Discussion
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