The correct answer involves using IAM roles for tasks with policies that grant cross-service permissions, combined with ECS Service Connect for encrypted DNS-based communication and AWS Secrets Manager for securely storing credentials. This approach works because IAM roles for tasks provide fine-grained, temporary credentials to each container, eliminating the need for hardcoded keys, while Service Connect handles service discovery and mutual TLS encryption automatically, and Secrets Manager securely manages sensitive data like database passwords. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how to implement service-to-service authentication and authorization for ECS Fargate without overcomplicating the architecture—a common trap is choosing API Gateway or custom token services when native IAM and Service Connect suffice. Remember the memory tip: “Roles, Connect, Secrets” for the three pillars of secure microservice communication on Fargate.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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.
A company is designing a microservices architecture on Amazon ECS with Fargate. The services need to communicate securely and efficiently. The company wants to implement service-to-service authentication and authorization. Which THREE steps should the company take? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Secrets Manager to store and rotate service credentials.
Options A, C, and E are correct. A: ECS Service Connect provides DNS and encryption. C: IAM roles for tasks grant permissions. E: Secrets Manager stores secrets. Option B is not needed with Service Connect. Option D is for public APIs.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Use AWS Secrets Manager to store and rotate service credentials.
Why this is correct
Secrets Manager securely stores credentials for database or API keys.
Related concept
Authentication checks who the user is.
✗
Configure mutual TLS (mTLS) between services using certificates from ACM.
Why it's wrong here
mTLS is possible but adds complexity; Service Connect already provides encryption.
✓
Enable ECS Service Connect between services for automatic DNS and TLS encryption.
Why this is correct
Service Connect provides secure service discovery and encryption.
Related concept
Authentication checks who the user is.
✗
Deploy an API Gateway in front of each microservice.
Why it's wrong here
API Gateway is for external APIs, not internal service-to-service communication.
✓
Use IAM roles for tasks and attach policies that allow access to other services.
Why this is correct
IAM roles grant permissions for tasks to call other AWS services.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SAP-C02 questions on access control and AAA configuration.
Design for New Solutions — This question tests Design for New Solutions — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Use AWS Secrets Manager to store and rotate service credentials. — Options A, C, and E are correct. A: ECS Service Connect provides DNS and encryption. C: IAM roles for tasks grant permissions. E: Secrets Manager stores secrets. Option B is not needed with Service Connect. Option D is for public APIs.
What should I do if I get this SAP-C02 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related SAP-C02 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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