The answer is that the DBA failed to create a database user with IAM authentication enabled. In RDS PostgreSQL, simply attaching an IAM role and enabling SSL is not enough; the database itself must have a user account created with the `rds_iam` role granted, typically using `CREATE USER username WITH LOGIN; GRANT rds_iam TO username;`. Without this step, the database has no user mapped to the IAM authentication token, so it rejects the connection with the “IAM authentication is not enabled for this user” error. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that IAM database authentication requires a two-part setup: the AWS side (IAM policy and role) and the database side (user with `rds_iam` privilege). A common trap is assuming the master user or an existing password-based user can automatically use IAM tokens—they cannot. Memory tip: “IAM in the cloud, `rds_iam` in the database—both sides must agree.”
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. 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 financial services company runs a critical application on Amazon RDS for PostgreSQL. The database stores sensitive customer financial data. The security team has mandated that all access to the database must be through IAM database authentication to eliminate the need for passwords. The application currently uses a master user password stored in AWS Secrets Manager. The DBA needs to implement IAM authentication without downtime. The application is deployed on Amazon ECS and connects to the database using a connection string. The DBA has already created an IAM role for the ECS task with a policy that allows rds-db:connect. The DBA has also modified the DB instance to require SSL. However, after making these changes, the application cannot connect. The error message indicates 'IAM authentication is not enabled for this user'. What step did the DBA miss?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The DBA did not create a database user that is set to use IAM authentication.
Option B is correct because IAM database authentication requires that the database user be created with the IAM authentication method (using the CREATEROLE option and granting rds_iam role). Without creating a user that is mapped to the IAM role, authentication fails. Option A is wrong because the IAM role is already created. Option C is wrong because IAM authentication does not require a password; it uses authentication tokens. Option D is wrong because the port does not need to be changed.
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.
✓
The DBA did not create a database user that is set to use IAM authentication.
Why this is correct
A database user must be created with the rds_iam role.
Related concept
Static NAT maps one inside address to one outside address.
✗
The DBA did not attach the IAM policy to the ECS task role.
Why it's wrong here
The DBA already created the role and attached the policy.
✗
The DBA did not enable the 'password' authentication method.
Why it's wrong here
IAM authentication replaces password authentication.
✗
The DBA did not update the security group to allow traffic on port 5432.
Why it's wrong here
The port is already open for existing connections.
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 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 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.
Database Security — This question tests Database Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The DBA did not create a database user that is set to use IAM authentication. — Option B is correct because IAM database authentication requires that the database user be created with the IAM authentication method (using the CREATEROLE option and granting rds_iam role). Without creating a user that is mapped to the IAM role, authentication fails. Option A is wrong because the IAM role is already created. Option C is wrong because IAM authentication does not require a password; it uses authentication tokens. Option D is wrong because the port does not need to be changed.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A developer is configuring an Amazon RDS for PostgreSQL DB instance. The application connects using IAM database authentication. Which setting must be enabled on the DB instance for IAM authentication to work?
easy
A.Set the database port to 5432.
✓ B.Set the 'rds.force_ssl' parameter to 1.
C.Ensure the DB instance is publicly accessible.
D.Change the master username to 'iam_user'.
Why B: Option B is correct because IAM database authentication requires the 'rds.force_ssl' parameter to be set to 1 to enforce TLS connections. Option A is wrong because IAM authentication does not require the database port to be changed. Option C is wrong because the master username is still used for IAM authentication. Option D is wrong because the DB instance can be in a VPC; IAM authentication works within a VPC.
Last reviewed: Jun 20, 2026
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This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.
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