- A
Modify the existing RDS DB instance and enable encryption.
Why wrong: You cannot enable encryption on an existing unencrypted RDS instance.
- B
Create a new RDS DB instance with encryption enabled and migrate the data.
Encryption can only be enabled at creation time.
- C
Enable Oracle Transparent Data Encryption (TDE) on the existing RDS instance.
Why wrong: While TDE is supported on RDS Oracle, you need to use an option group and it can be enabled on existing instances, but the question asks for encryption at rest which is also achievable via KMS; however, TDE is an additional cost and the simplest answer is to create a new encrypted instance.
- D
Take a snapshot of the existing database, encrypt the snapshot, and restore from it.
Why wrong: You cannot encrypt a snapshot of an unencrypted 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 is migrating an on-premises Oracle database to Amazon RDS for Oracle. The database contains sensitive data that must be encrypted at rest. Which action should the company take to enable encryption on the RDS instance?
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
Create a new RDS DB instance with encryption enabled and migrate the data.
Amazon RDS for Oracle supports encryption at rest using AWS KMS. Encryption can only be enabled when the DB instance is created; you cannot encrypt an existing unencrypted RDS instance. You must either create a new encrypted instance and migrate the data, or use Oracle features like TDE. Option A is correct because you create a new encrypted instance. Option B is wrong because you cannot modify an existing instance to add encryption. Option C is wrong because you cannot encrypt a snapshot and restore from it if the original instance was unencrypted. Option D is wrong because Oracle TDE is an option but requires additional configuration; the simplest solution is to create a new encrypted 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.
- ✗
Modify the existing RDS DB instance and enable encryption.
Why it's wrong here
You cannot enable encryption on an existing unencrypted RDS instance.
- ✓
Create a new RDS DB instance with encryption enabled and migrate the data.
Why this is correct
Encryption can only be enabled at creation time.
Related concept
Standard ACLs match source addresses.
- ✗
Enable Oracle Transparent Data Encryption (TDE) on the existing RDS instance.
Why it's wrong here
While TDE is supported on RDS Oracle, you need to use an option group and it can be enabled on existing instances, but the question asks for encryption at rest which is also achievable via KMS; however, TDE is an additional cost and the simplest answer is to create a new encrypted instance.
- ✗
Take a snapshot of the existing database, encrypt the snapshot, and restore from it.
Why it's wrong here
You cannot encrypt a snapshot of an unencrypted 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: Create a new RDS DB instance with encryption enabled and migrate the data. — Amazon RDS for Oracle supports encryption at rest using AWS KMS. Encryption can only be enabled when the DB instance is created; you cannot encrypt an existing unencrypted RDS instance. You must either create a new encrypted instance and migrate the data, or use Oracle features like TDE. Option A is correct because you create a new encrypted instance. Option B is wrong because you cannot modify an existing instance to add encryption. Option C is wrong because you cannot encrypt a snapshot and restore from it if the original instance was unencrypted. Option D is wrong because Oracle TDE is an option but requires additional configuration; the simplest solution is to create a new encrypted 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
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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