The correct answer is that the user is denied from creating the unencrypted instance because of the Deny statement. This occurs because IAM policy evaluation logic gives explicit Deny statements absolute precedence over any Allow statements; even though the Allow statement broadly permits all rds:CreateDBInstance actions, the Deny statement with the condition key rds:StorageEncrypted set to false explicitly blocks any attempt to launch an unencrypted database. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of the IAM policy evaluation hierarchy—specifically that a Deny overrides an Allow, and that conditions can enforce encryption requirements at the API level. A common trap is assuming an Allow alone is sufficient, but the Deny acts as a hard block. Memory tip: “Deny always wins—if it says no, the Allow can’t go.”
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user is denied from creating the unencrypted instance because of the Deny statement.
Option C is correct because the Deny statement with condition rds:StorageEncrypted=false explicitly denies creating unencrypted instances. The Allow statement allows all creates, but the Deny overrides it. Option A is wrong because the Deny takes precedence. Option B is wrong because the Allow alone would allow it, but the Deny blocks it. Option D is wrong because the Deny is explicit, not implicit.
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.
✓
The user is denied from creating the unencrypted instance because of the Deny statement.
Why this is correct
The Deny statement explicitly denies creation when encryption is false.
Related concept
Standard ACLs match source addresses.
✗
The user is allowed to create the unencrypted instance because the Deny statement is not valid.
Why it's wrong here
The Deny statement is valid and will be evaluated.
✗
The user is denied from creating any DB instance because of an implicit deny.
Why it's wrong here
The Allow statement allows creation, but the Deny overrides for unencrypted instances.
✗
The user is allowed to create the unencrypted instance because of the Allow statement.
Why it's wrong here
Deny statements override Allow statements.
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.
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: The user is denied from creating the unencrypted instance because of the Deny statement. — Option C is correct because the Deny statement with condition rds:StorageEncrypted=false explicitly denies creating unencrypted instances. The Allow statement allows all creates, but the Deny overrides it. Option A is wrong because the Deny takes precedence. Option B is wrong because the Allow alone would allow it, but the Deny blocks it. Option D is wrong because the Deny is explicit, not implicit.
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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Question Discussion
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