The answer is to take a snapshot of the database, copy it with encryption enabled, and restore from the encrypted snapshot. This is the only supported method to enable encryption at rest on an existing Amazon RDS instance because encryption is a property set at launch time and cannot be modified on a running instance. The process works by creating an unencrypted snapshot, then using the copy-snapshot operation to apply AWS KMS encryption, and finally restoring that encrypted snapshot to a new RDS instance. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding that RDS encryption is immutable after creation, often appearing as a trap where candidates incorrectly try to modify the instance directly or overcomplicate the solution with DMS. A common memory tip is “snapshot, copy, restore—you cannot encrypt an existing RDS instance in place.”
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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 uses Amazon RDS for MySQL to store application data. The database contains personally identifiable information (PII). The security team requires that all data be encrypted at rest using AWS KMS. The database is currently unencrypted. The data engineer needs to enable encryption without significant downtime. Which approach should the data engineer take?
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 database, copy it with encryption enabled, and restore from the encrypted snapshot.
Option D is correct. To enable encryption on an existing RDS instance, you must take a snapshot, copy it with encryption, and restore from the encrypted snapshot. This process involves some downtime but is the only way. Option A is wrong because you cannot modify the instance to enable encryption directly. Option B is wrong because you cannot enable encryption on the existing instance via modification. Option C is wrong because DMS requires source and target, and the target can be encrypted, but it's more complex.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 AWS DMS to migrate data to a new encrypted RDS instance continuously.
Why it's wrong here
Possible but incurs additional cost and complexity; snapshot method is simpler.
✓
Take a snapshot of the database, copy it with encryption enabled, and restore from the encrypted snapshot.
Why this is correct
Standard procedure to enable encryption on existing RDS.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a read replica with encryption enabled and promote it to primary.
Why it's wrong here
Read replicas can be encrypted, but the primary remains unencrypted.
✗
Modify the RDS instance and enable encryption in the configuration.
Why it's wrong here
Not possible; encryption can only be enabled at creation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Take a snapshot of the database, copy it with encryption enabled, and restore from the encrypted snapshot. — Option D is correct. To enable encryption on an existing RDS instance, you must take a snapshot, copy it with encryption, and restore from the encrypted snapshot. This process involves some downtime but is the only way. Option A is wrong because you cannot modify the instance to enable encryption directly. Option B is wrong because you cannot enable encryption on the existing instance via modification. Option C is wrong because DMS requires source and target, and the target can be encrypted, but it's more complex.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This DEA-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 DEA-C01 exam.
Question Discussion
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