ANS-C01 Network Design Practice Question

A company needs to resolve DNS names for their EC2 instances using custom domain names like "app.example.com". Which AWS service should they use?

⚠ Common exam trap

Many exam-takers confuse AWS Cloud Map's service discovery capabilities with DNS resolution, but Cloud Map is designed for dynamic service endpoints (e.g., ECS tasks) and does not natively resolve arbitrary custom domain names like 'app.example.com' without Route 53.

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

✓

Amazon Route 53

Amazon Route 53 is a scalable DNS web service that can resolve custom domain names like 'app.example.com' to EC2 instance IP addresses. It supports private hosted zones for VPCs, enabling DNS resolution for internal resources without exposing them to the internet, and integrates with EC2 via alias records or health checks.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
AWS Cloud Map
Why it's wrong here
Service discovery, not DNS resolution for custom domains.
✗
AWS Directory Service
Why it's wrong here
For Microsoft AD.
✓
Amazon Route 53
Why this is correct
Managed DNS service.
✗
Amazon Cognito
Why it's wrong here
Identity platform.

Visual reference

Go deeper

ANS-C01 Network Design Practice Question

Why each option matters

Option-by-option breakdown

Related to this question