ITIL4-CDS Create, Deliver and Support Practice Question
Exhibit
CONFIG: { 'CI_CD_TRIGGER': 'ON_COMMIT', 'TEST_AUTOMATION': 'REQUIRED', 'SECURITY_SCAN': 'REQUIRED', 'DEPLOYMENT_STRATEGY': 'BLUE_GREEN' }Refer to the exhibit. Which operational benefit does the 'Blue-Green' deployment strategy provide in this CDS configuration?
⚠ Common exam trap
Candidates frequently focus only on the 'no downtime' aspect, failing to realize that the primary operational benefit in a CDS context is specifically the ability to perform an instantaneous rollback.
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
✓
It enables immediate rollbacks and minimizes service downtime.
Blue-Green deployment allows for near-zero downtime and quick rollback capability. By maintaining two identical environments, the team can deploy to the 'green' environment and test it fully before switching traffic from the 'blue' environment. If an issue occurs, switching back is instantaneous. This is a vital CDS practice for maintaining high service availability and minimizing the risk associated with production releases, directly supporting operational stability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It reduces the storage cost of maintaining two separate environments.
Why it's wrong here
Blue-Green deployments actually increase storage and infrastructure costs because two identical environments must be maintained simultaneously. The benefit is not cost-saving but rather risk reduction and service continuity, which justifies the additional investment in infrastructure to ensure that deployments are safe, reliable, and easily reversible if problems occur.
- ✓
It enables immediate rollbacks and minimizes service downtime.
Why this is correct
The primary advantage of Blue-Green deployment is the ability to revert to the previous environment instantly by switching the traffic router back to 'blue.' This minimizes service downtime and provides a safe mechanism for production releases, which is essential for maintaining the high availability required by modern business services.
- ✗
It forces developers to write code for two different platforms.
Why it's wrong here
Blue-Green deployment involves two instances of the same service, not two different platforms. The code remains the same across both environments. This strategy is about operational safety, not changing the development requirements or forcing the team to work with multiple, heterogeneous technical architectures that could add unnecessary complexity.
- ✗
It eliminates the need for any pre-deployment testing.
Why it's wrong here
Blue-Green deployment does not replace testing; it complements it. In fact, it provides a final testing ground in the production-like environment before switching live traffic. Relying on the deployment strategy to catch issues instead of testing is a dangerous practice that risks service stability and user trust.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official PeopleCert/AXELOS exam blueprint
This ITIL4-CDS practice question is part of Courseiva's free PeopleCert/AXELOS 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 ITIL4-CDS exam.