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.
An IAM policy is attached to an IAM user. The user wants to connect to an RDS MySQL database using IAM database authentication. What does this policy allow?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Allows the user to connect to the RDS instance with the database user name 'db_user1'.
Option C is correct. IAM database authentication allows an IAM user to authenticate to an RDS MySQL database using an IAM user or role. The IAM policy must include the rds-db:connect action with a resource ARN specifying the RDS instance and the database user name. When the resource ARN includes 'db_user1', the policy only permits connection as that specific database user, not as any user. Option A is incorrect because the policy does not grant permissions to any database or any user; it is scoped to 'db_user1'. Option B is incorrect because the rds-db:connect action does not grant management of the RDS instance. Option D is incorrect because the resource ARN restricts to 'db_user1', so connecting with any other database user name would be denied.
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.
✗
Allows the user to connect to any database on the RDS instance as any user.
Why it's wrong here
The resource is specific to one user.
✗
Allows the user to manage the RDS instance.
Why it's wrong here
The action is 'rds-db:connect', not management actions.
✓
Allows the user to connect to the RDS instance with the database user name 'db_user1'.
Why this is correct
The resource specifies the database user.
Related concept
Standard ACLs match source addresses.
✗
Allows the user to connect to the RDS instance with any database user name.
Why it's wrong here
It allows only 'db_user1'.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Allows the user to connect to the RDS instance with the database user name 'db_user1'. — Option C is correct. IAM database authentication allows an IAM user to authenticate to an RDS MySQL database using an IAM user or role. The IAM policy must include the rds-db:connect action with a resource ARN specifying the RDS instance and the database user name. When the resource ARN includes 'db_user1', the policy only permits connection as that specific database user, not as any user. Option A is incorrect because the policy does not grant permissions to any database or any user; it is scoped to 'db_user1'. Option B is incorrect because the rds-db:connect action does not grant management of the RDS instance. Option D is incorrect because the resource ARN restricts to 'db_user1', so connecting with any other database user name would be denied.
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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