SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 healthcare document service uses Amazon RDS for PostgreSQL. Application credentials must not be stored on the EC2 instances, and authentication should use short-lived credentials. What should the architect recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
IAM database authentication for RDS with an EC2 instance role
IAM database authentication for RDS with an EC2 instance role is correct because it allows the EC2 instance to assume an IAM role and obtain a short-lived authentication token (valid for 15 minutes) to connect to the PostgreSQL database, eliminating the need to store any credentials on the instance. This approach meets both requirements: no credentials stored on EC2 and the use of short-lived credentials. The token is generated using the AWS CLI or SDK with the IAM role's temporary security credentials, and the RDS instance must be configured to accept IAM authentication.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Embed the database password in the AMI
Why it's wrong here
Baking secrets into an AMI makes rotation and exposure control difficult.
✗
Store the database password in user data
Why it's wrong here
User data can be read from the instance and is not appropriate for secrets.
✗
Use a security group rule that allows only application instances
Why it's wrong here
Security groups limit network access but do not replace database authentication.
✓
IAM database authentication for RDS with an EC2 instance role
Why this is correct
IAM database authentication allows the application to use temporary AWS credentials instead of stored database passwords.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think security groups alone solve credential management, but they only control network access, not authentication or credential lifecycle, so they fail to address the short-lived credential requirement.
Detailed technical explanation
How to think about this question
IAM database authentication works by having the EC2 instance use its IAM role to call the RDS API action `GenerateDbAuthToken`, which returns a token that is a signed string used as the password in the PostgreSQL connection. The token is valid for 15 minutes by default and is generated using AWS Signature Version 4. The RDS instance must have the `rds_iam` role granted to the database user, and the PostgreSQL connection must use SSL/TLS to ensure the token is transmitted securely.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: IAM database authentication for RDS with an EC2 instance role — IAM database authentication for RDS with an EC2 instance role is correct because it allows the EC2 instance to assume an IAM role and obtain a short-lived authentication token (valid for 15 minutes) to connect to the PostgreSQL database, eliminating the need to store any credentials on the instance. This approach meets both requirements: no credentials stored on EC2 and the use of short-lived credentials. The token is generated using the AWS CLI or SDK with the IAM role's temporary security credentials, and the RDS instance must be configured to accept IAM authentication.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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