The answer is to create a new DB instance and specify the customer-managed KMS key for encryption at rest. This is required because Amazon RDS for Oracle only allows encryption to be enabled at launch time; you cannot retroactively encrypt an existing instance without first creating an encrypted snapshot and restoring it as a new DB instance. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding that encryption at rest is a creation-time decision, and that using a customer-managed KMS key requires explicitly selecting it during the instance setup rather than relying on the default AWS managed key. A common trap is assuming you can modify an existing unencrypted instance to add encryption, which is not supported. Remember the mnemonic: "Encrypt at birth, not after birth" — encryption must be set when the DB instance is born.
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 its Oracle database to Amazon RDS for Oracle. The security team requires that all data be encrypted at rest using a customer-managed AWS KMS key. Which TWO steps are necessary to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Migrate the data using Oracle Data Pump to the new encrypted instance.
Options B and C are correct. Option A is wrong because encryption must be enabled at creation time; you cannot add it later without a snapshot. Option D is wrong because the default RDS encryption key is AWS managed, not customer managed. Option E is wrong because modifying the DB instance after creation does not enable encryption.
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.
✓
Migrate the data using Oracle Data Pump to the new encrypted instance.
Why this is correct
Data must be migrated to the new encrypted instance.
Related concept
Standard ACLs match source addresses.
✗
Modify the DB instance to enable encryption using a KMS key.
Why it's wrong here
Encryption cannot be added to an existing instance.
✓
Create a new DB instance and specify the KMS key for encryption.
Why this is correct
Encryption is enabled at launch with a customer-managed KMS key.
Related concept
Standard ACLs match source addresses.
✗
Enable encryption at rest on the existing RDS instance by modifying the DB instance.
Why it's wrong here
Encryption cannot be enabled on an existing instance; must be done at creation.
✗
Use the default RDS encryption key (aws/rds) to encrypt the instance.
Why it's wrong here
Default key is AWS managed, not customer managed.
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: Migrate the data using Oracle Data Pump to the new encrypted instance. — Options B and C are correct. Option A is wrong because encryption must be enabled at creation time; you cannot add it later without a snapshot. Option D is wrong because the default RDS encryption key is AWS managed, not customer managed. Option E is wrong because modifying the DB instance after creation does not enable encryption.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.