- A
Enable encryption on the RDS instance using the default RDS encryption and use AWS Secrets Manager to store the key.
Why wrong: Default encryption uses an AWS managed key, not customer-managed.
- B
Create a customer-managed key in AWS KMS, enable automatic rotation, and enable encryption on the RDS instance using that key.
Customer-managed KMS keys support automatic annual rotation.
- C
Create a customer-managed key in AWS KMS without automatic rotation, and manually rotate the key using the RDS console.
Why wrong: Manual rotation is error-prone and not automated.
- D
Use an AWS managed key for RDS and create an AWS Lambda function to rotate the key manually each year.
Why wrong: AWS managed keys cannot be rotated manually; rotation is automatic but not user-controlled.
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 database contains personally identifiable information (PII). The security team requires that the data be encrypted at rest using a customer-managed key stored in AWS KMS. Additionally, the team wants to ensure that the key can be rotated automatically every year. What should the company do to meet these requirements?
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
Create a customer-managed key in AWS KMS, enable automatic rotation, and enable encryption on the RDS instance using that key.
Option A is correct because RDS supports encryption at rest using a KMS key, and customer-managed keys can be rotated automatically. Option B is not possible. Option C does not cover encryption at rest. Option D does not provide automatic rotation.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable encryption on the RDS instance using the default RDS encryption and use AWS Secrets Manager to store the key.
Why it's wrong here
Default encryption uses an AWS managed key, not customer-managed.
- ✓
Create a customer-managed key in AWS KMS, enable automatic rotation, and enable encryption on the RDS instance using that key.
Why this is correct
Customer-managed KMS keys support automatic annual rotation.
Related concept
Standard ACLs match source addresses.
- ✗
Create a customer-managed key in AWS KMS without automatic rotation, and manually rotate the key using the RDS console.
Why it's wrong here
Manual rotation is error-prone and not automated.
- ✗
Use an AWS managed key for RDS and create an AWS Lambda function to rotate the key manually each year.
Why it's wrong here
AWS managed keys cannot be rotated manually; rotation is automatic but not user-controlled.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a customer-managed key in AWS KMS, enable automatic rotation, and enable encryption on the RDS instance using that key. — Option A is correct because RDS supports encryption at rest using a KMS key, and customer-managed keys can be rotated automatically. Option B is not possible. Option C does not cover encryption at rest. Option D does not provide automatic rotation.
What should I do if I get this DBS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DBS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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