SAP-C02 Design for New Solutions Practice Question
A company is designing a microservices architecture on Amazon ECS with Fargate. They want to ensure that services can communicate with each other but are isolated from the internet. What is the MOST secure way to achieve this?
⚠ Common exam trap
It's easy for candidates to confuse VPC peering or PrivateLink as solutions for internal service communication, but these are designed for cross-VPC or external service access, not for secure, internet-isolated inter-service discovery within a single VPC.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Place all ECS services in private subnets and use AWS Cloud Map for service discovery.
Placing ECS services in private subnets ensures they have no direct internet access, while AWS Cloud Map provides a secure, DNS-based service discovery mechanism that allows services to communicate internally using private IP addresses. This design eliminates exposure to the internet and leverages AWS's native service discovery for dynamic microservices.
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 VPC peering to connect the subnets of each service.
Why it's wrong here
VPC peering connects VPCs, but does not provide service discovery.
- ✗
Use AWS PrivateLink to create VPC endpoints for each service.
Why it's wrong here
PrivateLink is used to access services across VPCs, not for internal service discovery.
- ✗
Place services in public subnets and use security groups to restrict inbound traffic.
Why it's wrong here
Public subnets expose services to the internet, increasing risk.
- ✓
Place all ECS services in private subnets and use AWS Cloud Map for service discovery.
Why this is correct
Private subnets ensure no internet exposure; Cloud Map provides DNS-based service discovery.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-C02 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 SAP-C02 exam.