- A
Grant the RDS service principal (rds.amazonaws.com) only the necessary KMS permissions to use the CMK.
Least privilege ensures that only RDS can use the key for encryption operations.
- B
Create separate KMS keys for different environments (e.g., production, development).
Separation of keys limits blast radius and allows different access controls.
- C
Disable key rotation to maintain consistent encryption across all snapshots.
Why wrong: Disabling rotation is not a best practice; AWS KMS supports rotating keys without affecting existing data.
- D
Store the KMS CMK inside the Oracle database for faster encryption.
Why wrong: Storing keys inside the database defeats the purpose of KMS and is insecure.
- E
Enable automatic rotation of the KMS CMK annually.
Automatic rotation helps meet compliance requirements.
Quick Answer
The correct answer is to enable automatic rotation of the KMS CMK annually, use separate KMS keys for different environments, and grant least privilege access to the KMS keys. These three best practices ensure that your RDS Oracle encryption at rest remains secure by isolating keys per environment to limit blast radius, automating key rotation to reduce the risk of compromised keys, and applying the principle of least privilege to prevent unauthorized decryption. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of KMS key management best practices for RDS Oracle encryption, often appearing as a multi-select trap where candidates mistakenly choose storing the CMK in the database or disabling rotation. A common pitfall is confusing key material storage with key management—never store a CMK inside the database itself, as that defeats KMS’s purpose. Memory tip: think “R-A-L” for Rotation, isolation via separate keys, and Least privilege.
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 designing a secure strategy for managing Amazon RDS for Oracle encryption keys. They want to use AWS KMS with Customer Master Keys (CMKs) for encryption at rest. Which THREE best practices should they follow?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Grant the RDS service principal (rds.amazonaws.com) only the necessary KMS permissions to use the CMK.
Options A, C, and D are correct. Using separate KMS keys for different environments provides isolation, enabling automatic key rotation is a security best practice, and granting least privilege access to KMS keys is fundamental. Option B is wrong because storing the CMK in the database is insecure. Option E is wrong because disabling key rotation is not recommended.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Grant the RDS service principal (rds.amazonaws.com) only the necessary KMS permissions to use the CMK.
Why this is correct
Least privilege ensures that only RDS can use the key for encryption operations.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
- ✓
Create separate KMS keys for different environments (e.g., production, development).
Why this is correct
Separation of keys limits blast radius and allows different access controls.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
- ✗
Disable key rotation to maintain consistent encryption across all snapshots.
Why it's wrong here
Disabling rotation is not a best practice; AWS KMS supports rotating keys without affecting existing data.
- ✗
Store the KMS CMK inside the Oracle database for faster encryption.
Why it's wrong here
Storing keys inside the database defeats the purpose of KMS and is insecure.
- ✓
Enable automatic rotation of the KMS CMK annually.
Why this is correct
Automatic rotation helps meet compliance requirements.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DBS-C01 questions on access control and AAA configuration.
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Database Security — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Grant the RDS service principal (rds.amazonaws.com) only the necessary KMS permissions to use the CMK. — Options A, C, and D are correct. Using separate KMS keys for different environments provides isolation, enabling automatic key rotation is a security best practice, and granting least privilege access to KMS keys is fundamental. Option B is wrong because storing the CMK in the database is insecure. Option E is wrong because disabling key rotation is not recommended.
What should I do if I get this DBS-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DBS-C01 questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 20, 2026
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