Google Google Certifications PROFESSIONAL-CLOUD-DEVELOPER Questions & Answers

• Question 61:

  You are building a CI/CD pipeline that consists of a version control system, Cloud Build, and Container Registry. Each time a new tag is pushed to the repository, a Cloud Build job is triggered, which runs unit tests on the new code builds a new Docker container image, and pushes it into Container Registry. The last step of your pipeline should deploy the new container to your production Google Kubernetes Engine (GKE) cluster. You need to select a tool and deployment strategy that meets the following requirements:

  ?Zero downtime is incurred ?Testing is fully automated ?Allows for testing before being rolled out to users ?Can quickly rollback if needed What should you do?

  A. Trigger a Spinnaker pipeline configured as an A/B test of your new code and, if it is successful, deploy the container to production.

  B. Trigger a Spinnaker pipeline configured as a canary test of your new code and, if it is successful, deploy the container to production.

  C. Trigger another Cloud Build job that uses the Kubernetes CLI tools to deploy your new container to your GKE cluster, where you can perform a canary test.

  D. Trigger another Cloud Build job that uses the Kubernetes CLI tools to deploy your new container to your GKE cluster, where you can perform a shadow test.

  Correct Answer: D

  Explanation: https://cloud.google.com/architecture/implementing-deployment-and-testing- strategies-on-gke#perform_a_shadow_test With a shadow test, you test the new version of your application by mirroring user traffic from the current application version without impacting the user requests.

• Question 62:

  Your application is composed of a set of loosely coupled services orchestrated by code executed on Compute Engine. You want your application to easily bring up new Compute Engine instances that find and use a specific version of a service. How should this be configured?

  A. Define your service endpoint information as metadata that is retrieved at runtime and used to connect to the desired service.

  B. Define your service endpoint information as label data that is retrieved at runtime and used to connect to the desired service.

  C. Define your service endpoint information to be retrieved from an environment variable at runtime and used to connect to the desired service.

  D. Define your service to use a fixed hostname and port to connect to the desired service. Replace the service at the endpoint with your new version.

  Correct Answer: A

  Explanation: https://cloud.google.com/service-infrastructure/docs/service- metadata/reference/rest#service-endpoint

• Question 63:

  Your application is built as a custom machine image. You have multiple unique deployments of the machine image. Each deployment is a separate managed instance group with its own template. Each deployment requires a unique set of configuration values. You want to provide these unique values to each deployment but use the same custom machine image in all deployments. You want to use out-of-the-box features of Compute Engine. What should you do?

  A. Place the unique configuration values in the persistent disk.

  B. Place the unique configuration values in a Cloud Bigtable table.

  C. Place the unique configuration values in the instance template startup script.

  D. Place the unique configuration values in the instance template instance metadata.

  Correct Answer: A

  Reference: https://cloud.google.com/compute/docs/instance-groups

• Question 64:

  You manage your company's ecommerce platform's payment system, which runs on Google Cloud. Your company must retain user logs for 1 year for internal auditing purposes and for 3 years to meet compliance requirements. You need to

  store new user logs on Google Cloud to minimize on-premises storage usage and ensure that they are easily searchable. You want to minimize effort while ensuring that the logs are stored correctly.

  What should you do?

  A. Store the logs in a Cloud Storage bucket with bucket lock turned on.

  B. Store the logs in a Cloud Storage bucket with a 3-year retention period.

  C. Store the logs in Cloud Logging as custom logs with a custom retention period.

  D. Store the logs in a Cloud Storage bucket with a 1-year retention period. After 1 year, move the logs to another bucket with a 2-year retention period.

  Correct Answer: C

  Explanation: https://cloud.google.com/logging/docs/buckets#custom-retention

• Question 65:

  Your company's product team has a new requirement based on customer demand to autoscale your stateless and distributed service running in a Google Kubernetes Engine (GKE) duster. You want to find a solution that minimizes changes because this feature will go live in two weeks. What should you do?

  A. Deploy a Vertical Pod Autoscaler, and scale based on the CPU load.

  B. Deploy a Vertical Pod Autoscaler, and scale based on a custom metric.

  C. Deploy a Horizontal Pod Autoscaler, and scale based on the CPU toad.

  D. Deploy a Horizontal Pod Autoscaler, and scale based on a custom metric.

  Correct Answer: C

  https://cloud.google.com/kubernetes-engine/docs/concepts/horizontalpodautoscaler

  The Horizontal Pod Autoscaler changes the shape of your Kubernetes workload by automatically increasing or decreasing the number of Pods in response to the workload's CPU or memory consumption, or in response to custom metrics reported from within Kubernetes or external metrics from sources outside of your cluster.

• Question 66:

  Your teammate has asked you to review the code below. Its purpose is to efficiently add a large number of small rows to a BigQuery table.

  

  Which improvement should you suggest your teammate make?

  A. Include multiple rows with each request.

  B. Perform the inserts in parallel by creating multiple threads.

  C. Write each row to a Cloud Storage object, then load into BigQuery.

  D. Write each row to a Cloud Storage object in parallel, then load into BigQuery.

  Correct Answer: B

• Question 67:

  You manage an ecommerce application that processes purchases from customers who can subsequently cancel or change those purchases. You discover that order volumes are highly variable and the backend order-processing system can only process one request at a time. You want to ensure seamless performance for customers regardless of usage volume. It is crucial that customers' order update requests are performed in the sequence in which they were generated. What should you do?

  A. Send the purchase and change requests over WebSockets to the backend.

  B. Send the purchase and change requests as REST requests to the backend.

  C. Use a Pub/Sub subscriber in pull mode and use a data store to manage ordering.

  D. Use a Pub/Sub subscriber in push mode and use a data store to manage ordering.

  Correct Answer: C

  Explanation: https://cloud.google.com/pubsub/docs/pull

• Question 68:

  You are using Cloud Build build to promote a Docker image to Development, Test, and Production environments. You need to ensure that the same Docker image is deployed to each of these environments. How should you identify the Docker image in your build?

  A. Use the latest Docker image tag.

  B. Use a unique Docker image name.

  C. Use the digest of the Docker image.

  D. Use a semantic version Docker image tag.

  Correct Answer: D

• Question 69:

  You want to use the Stackdriver Logging Agent to send an application's log file to Stackdriver from a Compute Engine virtual machine instance.

  After installing the Stackdriver Logging Agent, what should you do first?

  A. Enable the Error Reporting API on the project.

  B. Grant the instance full access to all Cloud APIs.

  C. Configure the application log file as a custom source.

  D. Create a Stackdriver Logs Export Sink with a filter that matches the application's log entries.

  Correct Answer: B

• Question 70:

  You configured your Compute Engine instance group to scale automatically according to overall CPU usage. However, your application's response latency increases sharply before the cluster has finished adding up instances. You want to provide a more consistent latency experience for your end users by changing the configuration ot the instance group autoscaler. Which two configuration changes should you make? (Choose two.)

  A. Add the label "AUTOSCALE" to the instance group template.

  B. Decrease the cool-down period for instances added to the group.

  C. Increase the target CPU usage for the instance group autoscaler.

  D. Decrease the target CPU usage for the instance group autoscaler.

  E. Remove the health-check for individual VMs in the instance group.

  Correct Answer: AC