PAS-C01 Migration Practice Question
A company is migrating a web application to AWS and wants to use a blue/green deployment strategy to minimize downtime. Which AWS service should be used to route traffic between the blue and green environments?
⚠ Common exam trap
Many exam-takers confuse load balancers (ALB) with traffic routing services, assuming an ALB can directly manage blue/green environments, but ALB requires Route 53 or similar DNS-level routing to split traffic between separate environments.
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 correct because it supports weighted DNS routing, which allows you to shift traffic gradually between blue and green environments by adjusting the weight values for DNS records. This enables a blue/green deployment strategy with minimal downtime, as Route 53 can route a percentage of traffic to the new environment while keeping the old environment active for rollback.
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 CloudFront
Why it's wrong here
CloudFront is a content delivery network, not suitable for routing traffic between environments.
- ✗
AWS Global Accelerator
Why it's wrong here
Global Accelerator improves performance but does not provide native blue/green routing capabilities.
- ✗
Application Load Balancer (ALB)
Why it's wrong here
ALB distributes traffic to targets within a single environment, not between blue and green.
- ✓
Amazon Route 53
Why this is correct
Route 53 supports weighted routing policy to shift traffic between blue and green environments.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 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 PAS-C01 exam.