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You are using the OCI Application Load Balancer (ALB) for your web application. You want to implement a blue/green deployment strategy to minimize downtime during application updates. You have two backend sets: 'blue' (the current version) and 'green' (the new version). What is the most efficient way to switch traffic from the 'blue' backend set to the 'green' backend set using the ALB's traffic management capabilities?
Correct Answer: C
* Goal:Minimize downtime in blue/green deployment with ALB. * ALB Capabilities:Supports weighted routing for gradual traffic shifts. * Evaluate Options: * A:Immediate switch risks downtime if 'green' fails; less efficient. * B:Listener swap causes abrupt change; not optimal. * C:Gradual shift with weights ensures smooth transition; most efficient. * D:Forcing 'blue' unhealthy is disruptive and hacky; inefficient. * Conclusion:Weighted routing provides the smoothest transition. ALB supports blue/green via routing rules. The Oracle Networking Professional study guide states, "Application Load Balancer's routing rules allow weighted traffic distribution between backend sets, enabling blue/green deployments with minimal downtime" (OCI Networking Documentation,Section: Load Balancer Routing). This method ensures stability during updates.
