The answer is to specify an AWS KMS key when launching the DB instance. This is required because Amazon RDS encryption at rest is a one-time decision made at instance creation; the encryption layer is applied to the underlying storage, automated backups, read replicas, and snapshots using a KMS key, and it cannot be enabled retroactively on an existing instance. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of immutable infrastructure constraints—a common trap is assuming you can modify encryption settings after launch, which leads to the correct remediation of creating a new encrypted instance and migrating data. Remember the key memory tip: “Encrypt at launch, or rebuild from scratch.”
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 data engineer is setting up an Amazon RDS for MySQL database. The compliance team requires that all data at rest be encrypted. What must the engineer do to enable encryption for this database?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Specify an AWS KMS key when launching the DB instance
Encryption at rest for Amazon RDS can only be enabled at launch time. After creation, you cannot enable encryption; you must create a new encrypted instance and migrate data.
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.
✓
Specify an AWS KMS key when launching the DB instance
Why this is correct
Encryption must be enabled at launch by choosing a KMS key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable encryption after the DB instance is created by modifying the DB instance
Why it's wrong here
RDS does not support enabling encryption on an existing unencrypted DB instance.
✗
Use AWS Secrets Manager to store the encryption key and attach it to the DB instance
Why it's wrong here
Secrets Manager does not encrypt the database; it stores secrets.
✗
Encrypt the underlying EBS volumes after the instance is created
Why it's wrong here
RDS does not expose underlying EBS volumes; encryption is managed at the database level.
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: Specify an AWS KMS key when launching the DB instance — Encryption at rest for Amazon RDS can only be enabled at launch time. After creation, you cannot enable encryption; you must create a new encrypted instance and migrate data.
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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Question Discussion
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