The answer is AWS App Mesh with Envoy sidecars, as it provides the best isolation and security for microservices on Amazon ECS with Fargate. By deploying Envoy sidecar proxies alongside each service, App Mesh creates a dedicated service mesh that enforces fine-grained traffic control, mutual TLS authentication, and observability at the application layer, ensuring services only communicate through defined APIs. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of microservices isolation and security with App Mesh, often contrasting it with overly permissive options like shared security groups or overly complex ones like per-service ALBs. A common trap is choosing VPC peering, which operates at the network layer and cannot enforce service-level policies. Memory tip: think of App Mesh as a “security bouncer” for each service—every request must pass through the Envoy sidecar, which checks the API pass before allowing entry.
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 new microservices architecture on Amazon ECS with Fargate. Each microservice must be isolated and able to communicate with others only through defined APIs. Which solution provides the BEST isolation and security?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS App Mesh with Envoy sidecars to control traffic between services.
Using a service mesh like App Mesh (option C) provides fine-grained traffic control and security between microservices. Option A (same security group) is too permissive. Option B (ALB per service) adds complexity. Option D (VPC peering) is for VPC-level, not service-level.
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.
✓
Use AWS App Mesh with Envoy sidecars to control traffic between services.
Why this is correct
App Mesh provides service-level security and observability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Place all microservices in the same security group and allow all traffic.
Why it's wrong here
No isolation.
✗
Use an Application Load Balancer per microservice with listener rules.
Why it's wrong here
Overly complex and not true isolation.
✗
Use VPC peering between each microservice's VPC.
Why it's wrong here
Not practical for many microservices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS App Mesh with Envoy sidecars to control traffic between services. — Using a service mesh like App Mesh (option C) provides fine-grained traffic control and security between microservices. Option A (same security group) is too permissive. Option B (ALB per service) adds complexity. Option D (VPC peering) is for VPC-level, not service-level.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 company is designing a microservices architecture on Amazon ECS with AWS Fargate. The services need to communicate with each other using HTTP APIs. The company wants to minimize operational overhead and enable canary deployments. Which solution should the company use for service discovery and traffic routing?
easy
A.Use Amazon API Gateway with VPC Link
B.Use an Application Load Balancer with target groups per service
C.Use Amazon Route 53 with weighted routing policies
✓ D.Use AWS App Mesh with Envoy sidecars
Why D: AWS App Mesh with Envoy sidecars provides a service mesh that handles service discovery, traffic routing, and canary deployments at the application layer. It integrates natively with ECS Fargate, offloading operational overhead by managing traffic splitting, retries, and observability without modifying application code. This makes it ideal for microservices requiring fine-grained control over HTTP traffic routing.
Variation 2. A company is designing a microservices architecture using Amazon ECS with Fargate. The services need to communicate with each other. Which approach provides the BEST security and performance?
medium
✓ A.Use AWS App Mesh for service-to-service communication with mutual TLS
B.Use VPC peering between the services' VPCs
C.Use an internet-facing Application Load Balancer for each service
D.Use an internal Network Load Balancer for each service
Why A: AWS App Mesh provides service mesh capabilities for secure communication with mTLS, observability, and traffic control. Option A (internet-facing ALB) exposes services to the internet. Option B (NLB) also exposes services. Option D (VPC peering) is for connecting VPCs, not microservices.
Variation 3. A company is designing a new microservices architecture using Amazon ECS with Fargate. The services need to communicate with each other using REST APIs. The company wants to implement a service mesh to handle traffic routing, observability, and security. Which AWS service should the company use?
medium
A.Elastic Load Balancing for internal network load balancers.
✓ B.AWS App Mesh.
C.AWS Cloud Map for service discovery.
D.Amazon API Gateway with VPC linking.
Why B: AWS App Mesh is a service mesh that provides traffic management, observability, and security for microservices. Option C is correct. Option A is wrong because API Gateway is for external APIs. Option B is wrong because Cloud Map is for service discovery. Option D is wrong because ELB is a load balancer, not a service mesh.
Last reviewed: Jun 20, 2026
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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.
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