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 is migrating its on-premises Oracle database to Amazon RDS for Oracle. As part of the migration, they need to ensure that all sensitive data is encrypted at rest using AWS Key Management Service (AWS KMS). Which configuration step is required to achieve this?
Modify the existing DB instance to enable encryption.
Why wrong: Enabling encryption on an existing unencrypted RDS instance is not supported directly; you must create a new encrypted instance or restore from a snapshot.
B
Configure SSL/TLS on the DB instance to encrypt data at rest.
Why wrong: SSL/TLS encrypts data in transit, not at rest.
C
Use AWS CloudHSM to generate and store the encryption keys.
Why wrong: AWS CloudHSM is not required for RDS encryption; AWS KMS can be used.
D
Create a new encrypted DB instance by enabling encryption and specifying a KMS key.
Creating a new encrypted RDS instance with a KMS key is the correct way to enable encryption at rest.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new encrypted DB instance by enabling encryption and specifying a KMS key.
Option C is correct because Amazon RDS for Oracle supports encryption at rest using AWS KMS by enabling encryption when creating the DB instance. Option A is wrong because enabling encryption on an existing unencrypted DB instance requires a snapshot restore, not a direct modification. Option B is wrong because AWS CloudHSM is not required; AWS KMS is sufficient. Option D is wrong because SSL/TLS encrypts data in transit, not at rest.
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.
✗
Modify the existing DB instance to enable encryption.
Why it's wrong here
Enabling encryption on an existing unencrypted RDS instance is not supported directly; you must create a new encrypted instance or restore from a snapshot.
✗
Configure SSL/TLS on the DB instance to encrypt data at rest.
Use AWS CloudHSM to generate and store the encryption keys.
Why it's wrong here
AWS CloudHSM is not required for RDS encryption; AWS KMS can be used.
✓
Create a new encrypted DB instance by enabling encryption and specifying a KMS key.
Why this is correct
Creating a new encrypted RDS instance with a KMS key is the correct way to enable encryption at rest.
Related concept
Standard ACLs match source addresses.
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.
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 new encrypted DB instance by enabling encryption and specifying a KMS key. — Option C is correct because Amazon RDS for Oracle supports encryption at rest using AWS KMS by enabling encryption when creating the DB instance. Option A is wrong because enabling encryption on an existing unencrypted DB instance requires a snapshot restore, not a direct modification. Option B is wrong because AWS CloudHSM is not required; AWS KMS is sufficient. Option D is wrong because SSL/TLS encrypts data in transit, not at rest.
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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Question Discussion
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