The correct answer is to use the `--enable-encryption` flag when creating the DB instance, alongside leveraging AWS KMS for encryption at rest. These two methods are valid because Amazon RDS for MySQL integrates directly with AWS Key Management Service (KMS) to transparently encrypt the underlying storage, automated backups, read replicas, and snapshots at the volume level, with no performance overhead or application changes required. On the AWS Certified Database Specialty DBS-C01 exam, this question tests your understanding of the distinction between encryption at rest versus in transit, and the specific limitations of RDS MySQL—namely that it does not support Transparent Data Encryption (TDE) or table-level encryption. A common trap is confusing SSL/TLS (which secures data in transit) with at-rest encryption, or assuming TDE is available for MySQL when it is not. Memory tip: think “KMS creates the key, encryption flag enables the lock” for RDS MySQL at rest.
DBS-C01 Management and Operations Practice Question
This DBS-C01 practice question tests your understanding of management and operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 of the following are valid methods to secure data at rest for an Amazon RDS for MySQL DB instance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable encryption at rest using AWS KMS.
Option B (encryption at rest using AWS KMS) and Option C (enabling encryption when creating the instance) are correct. Option A is incorrect because SSL/TLS secures data in transit, not at rest. Option D is incorrect because RDS does not support Transparent Data Encryption (TDE) for MySQL. Option E is incorrect because RDS encryption is not enabled at the table level.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable SSL/TLS for connections to the DB instance.
Static NAT maps one inside address to one outside address.
✓
Use the '--enable-encryption' flag when creating the DB instance.
Why this is correct
Encryption can be enabled at instance creation.
Related concept
Static NAT maps one inside address to one outside address.
✗
Implement Transparent Data Encryption (TDE) using Oracle-compatible settings.
Why it's wrong here
TDE is not available for RDS MySQL.
✗
Use Amazon RDS encryption at the table level using the ENCRYPT option.
Why it's wrong here
RDS encryption is at the storage level, not table level.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Management and Operations — This question tests Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable encryption at rest using AWS KMS. — Option B (encryption at rest using AWS KMS) and Option C (enabling encryption when creating the instance) are correct. Option A is incorrect because SSL/TLS secures data in transit, not at rest. Option D is incorrect because RDS does not support Transparent Data Encryption (TDE) for MySQL. Option E is incorrect because RDS encryption is not enabled at the table level.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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