- A
Enable SSL/TLS for connections to the DB instance.
Why wrong: SSL secures data in transit, not at rest.
- B
Enable encryption at rest using AWS KMS.
RDS supports encryption at rest using KMS.
- C
Use the '--enable-encryption' flag when creating the DB instance.
Why wrong: Option C is incorrect because the '--enable-encryption' flag does not exist in the AWS CLI. The correct flag is '--storage-encrypted'.
- D
Implement Transparent Data Encryption (TDE) using Oracle-compatible settings.
Why wrong: TDE is not available for RDS MySQL.
- E
Use Amazon RDS encryption at the table level using the ENCRYPT option.
Why wrong: RDS encryption is at the storage level, not table level.
Question 935 of 1,730
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 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
✓
Enable encryption at rest using AWS KMS.
Option B (encryption at rest using AWS KMS) is correct because Amazon RDS for MySQL supports encryption at rest using AWS KMS, which encrypts the underlying storage and automated backups. Option C is incorrect because there is no '--enable-encryption' flag in the AWS CLI; the correct parameter to enable encryption during instance creation is '--storage-encrypted'. Therefore, option C does not represent a valid method. Option A is incorrect because SSL/TLS secures data in transit, not at rest. Option D is incorrect because Transparent Data Encryption (TDE) is not supported for MySQL on RDS; it is available for Oracle and SQL Server. Option E is incorrect because Amazon RDS encryption is applied at the storage level, not the table level.
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.
- ✗
Enable SSL/TLS for connections to the DB instance.
- ✓
Enable encryption at rest using AWS KMS.
Why this is correct
RDS supports encryption at rest using KMS.
Related concept
Standard ACLs match source addresses.
- ✗
Use the '--enable-encryption' flag when creating the DB instance.
Why it's wrong here
Option C is incorrect because the '--enable-encryption' flag does not exist in the AWS CLI. The correct flag is '--storage-encrypted'.
- ✗
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: 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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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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Management and Operations — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Standard ACLs match source addresses..
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) is correct because Amazon RDS for MySQL supports encryption at rest using AWS KMS, which encrypts the underlying storage and automated backups. Option C is incorrect because there is no '--enable-encryption' flag in the AWS CLI; the correct parameter to enable encryption during instance creation is '--storage-encrypted'. Therefore, option C does not represent a valid method. Option A is incorrect because SSL/TLS secures data in transit, not at rest. Option D is incorrect because Transparent Data Encryption (TDE) is not supported for MySQL on RDS; it is available for Oracle and SQL Server. Option E is incorrect because Amazon RDS encryption is applied at the storage level, not the table level.
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
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