The correct answer is to take a snapshot of the instance, copy the snapshot with encryption enabled, and restore from the encrypted snapshot. This works because encryption in Amazon RDS is a property of the underlying storage, not the instance itself, so you cannot enable it directly on a running database; instead, you must create an encrypted copy of the snapshot, which applies AWS KMS encryption to the data at rest, and then restore a new encrypted instance from that copy. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding that encryption is immutable for existing instances—a common trap is trying to modify the instance or add a KMS key directly, both of which are invalid operations. Remember the key sequence: snapshot, encrypt copy, restore—never modify in place. A useful memory tip is "SEC" (Snapshot, Encrypt copy, Create instance).
DBS-C01 Database Security Practice Question
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 needs to encrypt an existing unencrypted Amazon RDS for Oracle DB instance. Which set of steps should be followed?
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 instance, copy the snapshot with encryption enabled, and restore from the encrypted snapshot.
Option C is correct. Option A is wrong because encryption cannot be enabled by modifying the instance. Option B is wrong because you cannot add a KMS key to an existing instance. Option D is wrong because you need to restore from an encrypted snapshot, not just copy it.
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 using the AWS Management Console by selecting the instance and choosing 'Enable Encryption'.
Why it's wrong here
No such option in console for existing instances.
✗
Modify the DB instance and set the KMS key ID to enable encryption.
Why it's wrong here
Modifying does not enable encryption.
✗
Copy the snapshot to an encrypted snapshot and then restore.
Why it's wrong here
You must enable encryption during the copy step.
✓
Take a snapshot of the instance, copy the snapshot with encryption enabled, and restore from the encrypted snapshot.
Why this is correct
This is the standard method.
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: Take a snapshot of the instance, copy the snapshot with encryption enabled, and restore from the encrypted snapshot. — Option C is correct. Option A is wrong because encryption cannot be enabled by modifying the instance. Option B is wrong because you cannot add a KMS key to an existing instance. Option D is wrong because you need to restore from an encrypted snapshot, not just copy it.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to encrypt an existing unencrypted Amazon RDS for PostgreSQL DB instance. What is the correct procedure?
easy
✓ A.Take a snapshot of the instance, create an encrypted copy of the snapshot, and restore the encrypted snapshot to a new DB instance.
B.Take a snapshot of the instance and restore it with encryption enabled.
C.Modify the DB instance and enable encryption in the RDS console.
D.Create a read replica of the instance and enable encryption on the replica.
Why A: Option C is correct because you must create a snapshot, copy it with encryption, and restore to a new encrypted instance. Option A is wrong because you cannot modify an existing instance to enable encryption. Option B is wrong because enabling encryption requires a snapshot copy. Option D is wrong because creating a read replica does not encrypt the primary.
Variation 2. A company wants to ensure that an Amazon RDS for MySQL DB instance is encrypted at rest. Which action should be taken to enable encryption for the first time?
easy
A.Enable encryption on the existing DB instance using the AWS CLI.
✓ B.Create a new encrypted DB instance using AWS KMS.
C.Set the rds.encrypted parameter to true in the DB parameter group.
D.Modify the existing DB instance and enable encryption.
Why B: Option A is correct because RDS encryption at rest can only be enabled when creating a new DB instance, not on an existing one. Option B is wrong because enabling encryption requires creating an encrypted snapshot and restoring as a new instance, not just modifying. Option C is wrong because encryption cannot be enabled on an existing instance. Option D is wrong because encryption is configured at instance creation, not through parameter groups.
Variation 3. 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?
hard
✓ A.Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.
B.Enable KMS encryption directly on the existing DB instance using the AWS CLI.
C.Create a read replica with KMS encryption.
D.Modify the DB instance and select the KMS key.
Why A: Option D is correct because to change the encryption key from Oracle TDE to KMS, you must take a snapshot, copy it with encryption (using KMS key), and restore. Option A is wrong because you cannot modify the encryption key in place. Option B is wrong because creating a read replica does not allow changing the encryption key. Option C is wrong because you cannot directly enable KMS on an existing TDE instance.
Last reviewed: Jun 20, 2026
Question Discussion
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This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
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