Implementing DevOps Solutions and Practices Using Cisco Platforms (DEVOPS) — Question 61

A team must roll out updates on the production instance of an application. To avoid any service down time, the new version must be released alongside the old version. After the team ensures that the new version operates as it should, traffic will be redirected to the new version. Then the old version will be shut down.

Which deployment strategy must be used?

Answer options

• A. rolling
• B. blue/green
• C. shadow
• D. canary

Correct answer: B

Explanation

The blue/green deployment strategy allows for a new version to be run in parallel with the old version, ensuring zero downtime during the transition. The rolling strategy updates instances gradually, which doesn't fit the requirement for simultaneous operation. Shadow deployments involve running the new version alongside the old but without directing user traffic, which is not the case here. Canary deployments release the new version to a small subset of users first, rather than fully deploying it alongside the old version.