3.3 Mitigating Incident Impact on Users PROFESSIONAL-CLOUD-DEVOPS-ENGINEER Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A retail company deployed a new version of their checkout service to production. Within 10 minutes, error rates on the checkout API spiked from 0.1% to 12%. The deployment was done via a rolling update, and the previous version is still available in the container registry. The team needs to restore service for users as quickly as possible while minimizing further risk. What should they do first?

   • ARedirect all traffic to a different region using global load balancing.
   • BRoll back the deployment to the previous container image version.
   • CEnable a feature flag to disable the new checkout logic.
   • DScale up the current deployment to handle the increased error rate.
   Reveal Solution Discussion Select an answer first
2. 2expert · hard

   A global application is deployed in two regions, us-central1 and europe-west1. A new version of the application is being rolled out. The team wants to use a canary release to test the new version in europe-west1 with a small percentage of traffic. They have a global load balancer with both regions as backends. What is the best way to implement this canary?

   • ARedirect all traffic to us-central1.
   • BUse a feature flag to enable the new version for a small percentage of users.
   • CDeploy the new version to all instances in europe-west1.
   • DCreate a new backend service in europe-west1 with the new version and set its traffic weight to a small percentage.
   Reveal Solution Discussion Select an answer first
4. 3expert · hard

   A team has a critical application that must be highly available. They are planning to deploy a new version. They want to minimize the risk of a full outage. They have decided to use a blue/green deployment strategy. What is the key advantage of this strategy over a rolling update?

   • AIt does not require a load balancer.
   • BIt requires less compute resources than a rolling update.
   • CIt automatically scales based on traffic.
   • DIt allows for instant rollback by switching traffic back to the previous version.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which rollback approach allows a team to test a new version with a small subset of users before full deployment, and can be used to quickly revert if issues are found?

   • ARolling update
   • BBlue-green deployment
   • CFeature flag
   • DCanary release
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   A team wants to quickly revert a service to a previously known-good version after a bad deployment. Which rollback approach is the fastest and most direct?

   • AScale down the new version and scale up the old version
   • BUse a feature flag to disable the new feature
   • CWait for the next scheduled deployment
   • DRedeploy the previous version of the application
   Reveal Solution Discussion Select an answer first