KCNA Cloud Native Application Delivery Practice Question
In a blue-green deployment strategy, at any given time, only one environment (blue or green) is active. What is the primary advantage of this approach?
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
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Instant rollback by switching traffic back to the previous environment
Blue-green deployments allow instant rollback by switching traffic back to the previous environment. This is the primary advantage: if issues arise in the new version, you can immediately revert by pointing the router/load balancer to the old environment. Option A describes gradual traffic shifting, which is characteristic of canary deployments, not blue-green. Option C is incorrect because blue-green requires two full environments, doubling resource consumption. Option D is false because a load balancer or ingress controller is essential to switch traffic between the two environments.
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