CV0-003 · Question #266
CV0-003 Question #266: Real Exam Question with Answer & Explanation
The correct answer is D: Three staging environments. All five stated requirements - zero downtime, uniform patch status on active servers, maintained performance, pre-production testing, and 10-minute rollback - are precisely what blue-green deployment is designed for. In blue-green: traffic runs on the live environment (blue) whil
Question
Options
- ARolling update
- BPatching directly
- CBlue-green deployment
- DThree staging environments
Explanation
All five stated requirements - zero downtime, uniform patch status on active servers, maintained performance, pre-production testing, and 10-minute rollback - are precisely what blue-green deployment is designed for. In blue-green: traffic runs on the live environment (blue) while the new patches are applied and tested on the idle environment (green); when validation passes, traffic is switched instantly (zero downtime); all servers in each environment are uniformly patched at all times (satisfying the same-patch-status requirement); the full blue environment remains available for immediate rollback within seconds if needed. Rolling update (A) violates the same-patch-status requirement because production servers exist at different patch levels simultaneously during the rollout. Patching directly (B) causes downtime. Three staging environments (D) describes a QA pipeline (dev/staging/prod) but does not inherently address zero-downtime switching or rapid rollback; it is an environment promotion model, not a deployment strategy. Blue-green deployment is the correct answer.
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