- A
Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.
Option A is correct because to change the encryption key from Oracle TDE to AWS KMS, you must take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. This process enables encryption at rest with KMS.
- B
Enable KMS encryption directly on the existing DB instance using the AWS CLI.
Why wrong: You cannot directly enable KMS encryption on an existing DB instance; a snapshot and restore is required.
- C
Create a read replica with KMS encryption.
Why wrong: Creating a read replica does not allow changing the encryption key; it only applies the same encryption as the source instance.
- D
Modify the DB instance and select the KMS key.
Why wrong: Option D is incorrect because you cannot modify the encryption key in place on an existing instance.
Migrate Oracle TDE to AWS KMS Encryption on RDS
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 has an Amazon RDS for Oracle DB instance that needs to be encrypted at rest. The instance currently uses Oracle Transparent Data Encryption (TDE) with a key stored in the database. The company wants to use AWS KMS for key management. What is the correct migration path?
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
Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.
Option A is correct because to change the encryption key from Oracle TDE to AWS KMS, you must take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. This process enables encryption at rest with KMS. Option D is incorrect because you cannot modify the encryption key in place on an existing instance. Option B is incorrect because creating a read replica does not allow changing the encryption key. Option C is incorrect because you cannot directly enable KMS encryption on an existing TDE instance.
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.
- ✓
Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.
Why this is correct
Option A is correct because to change the encryption key from Oracle TDE to AWS KMS, you must take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. This process enables encryption at rest with KMS.
Related concept
Standard ACLs match source addresses.
- ✗
Enable KMS encryption directly on the existing DB instance using the AWS CLI.
Why it's wrong here
You cannot directly enable KMS encryption on an existing DB instance; a snapshot and restore is required.
- ✗
Create a read replica with KMS encryption.
Why it's wrong here
Creating a read replica does not allow changing the encryption key; it only applies the same encryption as the source instance.
- ✗
Modify the DB instance and select the KMS key.
Why it's wrong here
Option D is incorrect because you cannot modify the encryption key in place on an existing instance.
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: Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. — Option A is correct because to change the encryption key from Oracle TDE to AWS KMS, you must take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. This process enables encryption at rest with KMS. Option D is incorrect because you cannot modify the encryption key in place on an existing instance. Option B is incorrect because creating a read replica does not allow changing the encryption key. Option C is incorrect because you cannot directly enable KMS encryption on an existing TDE instance.
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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