- A
Use AWS CloudHSM to generate and store encryption keys.
Why wrong: KMS provides automatic key rotation; CloudHSM is optional and not required.
- B
Enable encryption at rest on the RDS instance using AWS KMS.
Encryption at rest is required for PCI DSS.
- C
Use AWS Secrets Manager to automatically rotate database credentials.
Credential rotation is often required for compliance.
- D
Enable SSL/TLS for connections to the database.
Encryption in transit is required.
- E
Enable VPC Flow Logs to audit database connections.
Why wrong: Flow logs are for monitoring, not encryption.
Question 514 of 1,730
How to Achieve PCI DSS Compliance for Amazon RDS for Oracle
This DBS-C01 practice question tests your understanding of database security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 needs to comply with PCI DSS requirements for an Amazon RDS for Oracle DB instance. The requirements include encryption of sensitive data at rest and in transit, and automated key rotation. Which combination of services and configurations should be used? (Select THREE.)
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
✓
Enable encryption at rest on the RDS instance using AWS KMS.
Options B, C, and D are correct. Option B: Enable encryption at rest on the RDS instance using AWS KMS. Option C: Use AWS Secrets Manager to automatically rotate database credentials. Option D: Enable SSL/TLS for connections to the database. Option A is incorrect because AWS CloudHSM is not required for key rotation; KMS can handle key rotation automatically. Option E is incorrect because VPC Flow Logs are for network traffic monitoring, not encryption.
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.
- ✗
Use AWS CloudHSM to generate and store encryption keys.
Why it's wrong here
KMS provides automatic key rotation; CloudHSM is optional and not required.
- ✓
Enable encryption at rest on the RDS instance using AWS KMS.
Why this is correct
Encryption at rest is required for PCI DSS.
Related concept
Standard ACLs match source addresses.
- ✓
Use AWS Secrets Manager to automatically rotate database credentials.
Why this is correct
Credential rotation is often required for compliance.
Related concept
Standard ACLs match source addresses.
- ✓
Enable SSL/TLS for connections to the database.
Why this is correct
Encryption in transit is required.
Related concept
Standard ACLs match source addresses.
- ✗
Enable VPC Flow Logs to audit database connections.
Why it's wrong here
Flow logs are for monitoring, not encryption.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Enable encryption at rest on the RDS instance using AWS KMS. — Options B, C, and D are correct. Option B: Enable encryption at rest on the RDS instance using AWS KMS. Option C: Use AWS Secrets Manager to automatically rotate database credentials. Option D: Enable SSL/TLS for connections to the database. Option A is incorrect because AWS CloudHSM is not required for key rotation; KMS can handle key rotation automatically. Option E is incorrect because VPC Flow Logs are for network traffic monitoring, not encryption.
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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