The correct answer is that you can encrypt an existing unencrypted RDS Oracle instance by using AWS Database Migration Service (DMS) to migrate data to a new encrypted DB instance, or by creating a snapshot, copying it with encryption enabled, and restoring it as a new encrypted instance. These two methods work because encryption is a property set at instance launch; you cannot modify it on a running database, so you must create a new encrypted environment and move the data. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding that encryption is immutable for existing RDS instances, and the common trap is assuming you can simply toggle encryption in the console or enable it on a read replica. A useful memory tip is “snapshot copy or DMS move” — if you need to encrypt an unencrypted Oracle RDS, you must rebuild it from scratch using either a snapshot or a migration service.
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. 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.
Which TWO methods can be used to encrypt an existing unencrypted Amazon RDS for Oracle DB instance? (Choose 2.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a snapshot of the DB instance, copy the snapshot with encryption enabled, and restore the DB instance from the encrypted snapshot.
Options A and D are correct because you can create a snapshot, copy it with encryption, and restore; or use DMS to migrate to an encrypted target. Option B is wrong because you cannot directly enable encryption on an existing instance. Option C is wrong because enabling encryption on a replica requires the source to be encrypted. Option E is wrong because the console does not allow direct modification.
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 the AWS Management Console to toggle encryption on the DB instance.
Why it's wrong here
The console does not provide such an option.
✓
Create a snapshot of the DB instance, copy the snapshot with encryption enabled, and restore the DB instance from the encrypted snapshot.
Why this is correct
This is a supported method to encrypt an existing instance.
Related concept
Standard ACLs match source addresses.
✗
Modify the DB instance and enable encryption in the configuration.
Why it's wrong here
Encryption cannot be enabled on an existing unencrypted instance.
✓
Use AWS Database Migration Service (DMS) to migrate data to a new encrypted DB instance.
Why this is correct
DMS can migrate data to a new encrypted target.
Related concept
Standard ACLs match source addresses.
✗
Create a read replica with encryption enabled.
Why it's wrong here
A read replica inherits the encryption setting of the source.
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.
Management and Operations — This question tests Management and Operations — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a snapshot of the DB instance, copy the snapshot with encryption enabled, and restore the DB instance from the encrypted snapshot. — Options A and D are correct because you can create a snapshot, copy it with encryption, and restore; or use DMS to migrate to an encrypted target. Option B is wrong because you cannot directly enable encryption on an existing instance. Option C is wrong because enabling encryption on a replica requires the source to be encrypted. Option E is wrong because the console does not allow direct modification.
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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