AWS Cloud Map is the correct choice because it provides a fully managed service discovery solution that enables microservices to register themselves and discover other services dynamically using DNS queries or HTTP API calls. This directly addresses the need for dynamic registration and discovery in a microservices architecture, while its native integration with Amazon ECS, EKS, and Lambda ensures seamless operation within AWS. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this question tests your ability to distinguish between service discovery services—a common trap is confusing Cloud Map with Route 53, but Cloud Map is purpose-built for dynamic microservice registration and health-based routing, whereas Route 53 is primarily for DNS resolution of static resources. Remember the memory tip: Cloud Map = dynamic service map, Route 53 = static DNS map.
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 AWS. They need a solution for service discovery that allows services to register themselves and discover other services dynamically. The solution must be highly available and integrated with AWS-native services. Which AWS service should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Cloud Map
AWS Cloud Map is the correct choice because it is a fully managed service discovery service that allows microservices to register themselves dynamically and discover other services via DNS or HTTP API calls. It integrates natively with AWS services like Amazon ECS, Amazon EKS, and AWS Lambda, and provides high availability through automatic health checking and resource synchronization across AWS Regions.
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.
✗
Amazon ECS Service Discovery
Why it's wrong here
ECS Service Discovery is built on AWS Cloud Map; Cloud Map is the recommended service for this use case.
✗
Application Load Balancer (ALB)
Why it's wrong here
ALB distributes traffic but does not provide service discovery for multiple service types.
✓
AWS Cloud Map
Why this is correct
Cloud Map is a service discovery service that allows resources to register and discover each other, with health checks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon Route 53 private hosted zones
Why it's wrong here
Route 53 private hosted zones provide DNS resolution but not automatic service registration or health-based deregistration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Amazon ECS Service Discovery (Option A) as a separate service, when it is actually a feature of AWS Cloud Map, leading them to overlook Cloud Map as the correct, standalone service for dynamic service discovery.
Detailed technical explanation
How to think about this question
AWS Cloud Map uses a combination of DNS (A and SRV records) and HTTP API endpoints (via the AWS SDK or AWS CLI) to enable service discovery, with a default TTL of 60 seconds for DNS records to support rapid updates. It integrates with Route 53 health checks to automatically deregister unhealthy instances, and supports custom attributes (e.g., version, region) for advanced filtering during discovery. In a real-world scenario, a microservices architecture using Amazon ECS with service-to-service communication can leverage Cloud Map to avoid hardcoded IP addresses and enable blue/green deployments without traffic loss.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 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: AWS Cloud Map — AWS Cloud Map is the correct choice because it is a fully managed service discovery service that allows microservices to register themselves dynamically and discover other services via DNS or HTTP API calls. It integrates natively with AWS services like Amazon ECS, Amazon EKS, and AWS Lambda, and provides high availability through automatic health checking and resource synchronization across AWS Regions.
What should I do if I get this SAP-C02 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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