PCD practice questions 301–310

1. Question 301 · 357 in bank

   Select 2

   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 of the instance group autoscaler. Which two configuration changes should you make? (Choose two.)

   • AAdd the label ג€AUTOSCALEג€ to the instance group template.
   • BDecrease the cool-down period for instances added to the group.
   • CIncrease the target CPU usage for the instance group autoscaler.
   • DDecrease the target CPU usage for the instance group autoscaler.
   • ERemove the health-check for individual VMs in the instance group.

   Show answer

   Answer: BD

   Explanation

   For me the answer is B and D. "A cool down period value that is significantly longer causing a delay in scaling out". https://cloud.google.com/compute/docs/autoscaler#cool_down_period https://cloud.google.com/compute/docs/autoscaler/scaling-cpu#scaling_based_on_cpu_utilization

   Source: Adapted from community discussion — fraloca

   References

   • Google Cloud documentation
   • Google Cloud documentation

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2. Question 302 · 357 in bank

   You have an application controlled by a managed instance group. When you deploy a new version of the application, costs should be minimized and the number of instances should not increase. You want to ensure that, when each new instance is created, the deployment only continues if the new instance is healthy. What should you do?

   • APerform a rolling-action with maxSurge set to 1, maxUnavailable set to 0.
   • BPerform a rolling-action with maxSurge set to 0, maxUnavailable set to 1
   • CPerform a rolling-action with maxHealthy set to 1, maxUnhealthy set to 0.
   • DPerform a rolling-action with maxHealthy set to 0, maxUnhealthy set to 1.

   Show answer

   Answer: B

   Explanation

   i'll go with A( number of instances should not increase--- for this number shouldn't increase than target size i think, it doesn't mean no new instances should be created, they are asking in question, like when new instance is being created, so surge >0,) https://cloud.google.com/compute/docs/instance-groups/rolling-out-updates-to-managed-instance-groups#max_unavailable If you do not want any unavailable machines during an update, set the maxUnavailable value to 0 and the maxSurge value to greater than 0. With these settings, Compute Engine removes each old machine only after its replacement new machine is created and running.

   Source: Adapted from community discussion — yogi_508

   References

   • Google Cloud documentation

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3. Question 303 · 357 in bank

   Your application requires service accounts to be authenticated to GCP products via credentials stored on its host Compute Engine virtual machine instances. You want to distribute these credentials to the host instances as securely as possible. What should you do?

   • AUse HTTP signed URLs to securely provide access to the required resources.
   • BUse the instance's service account Application Default Credentials to authenticate to the required resources.
   • CGenerate a P12 file from the GCP Console after the instance is deployed, and copy the credentials to the host instance before starting the application.
   • DCommit the credential JSON file into your application's source repository, and have your CI/CD process package it with the software that is deployed to the instance.

   Show answer

   Answer: B

   Explanation

   Answer is B https://cloud.google.com/docs/authentication/production#automatically If the environment variable GOOGLE_APPLICATION_CREDENTIALS isn't set, ADC uses the service account that is attached to the resource that is running your code.

   Source: Adapted from community discussion — woriheck93

   References

   • Google Cloud documentation
   • Google Cloud documentation
   • Google Cloud documentation

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4. Question 304 · 357 in bank

   You are deploying your application to a Compute Engine virtual machine instance with the Stackdriver Monitoring Agent installed. Your application is a unix process on the instance. You want to be alerted if the unix process has not run for at least 5 minutes. You are not able to change the application to generate metrics or logs. Which alert condition should you configure?

   • AUptime check
   • BProcess health
   • CMetric absence
   • DMetric threshold

   Show answer

   Answer: C

   Explanation

   B Process-health policy A process-health policy can notify you if the number of processes that match a pattern crosses a threshold. This can be used to tell you, for example, that a process has stopped running.

   Source: Adapted from community discussion — gcper

   References

   • Google Cloud documentation
   • Google Cloud documentation

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5. Question 305 · 357 in bank

   Your application is deployed in a Google Kubernetes Engine (GKE) cluster. You want to expose this application publicly behind a Cloud Load Balancing HTTP(S) load balancer. What should you do?

   • AConfigure a GKE Ingress resource.
   • BConfigure a GKE Service resource.
   • CConfigure a GKE Ingress resource with type: LoadBalancer.
   • DConfigure a GKE Service resource with type: LoadBalancer.

   Show answer

   Answer: A

   Explanation

   Changing my answer to A https://cloud.google.com/kubernetes-engine/docs/concepts/ingress: "In GKE, an Ingress object defines rules for routing HTTP(S) traffic to applications running in a cluster. An Ingress object is associated with one or more Service objects, each of which is associated with a set of Pods. To learn more about how Ingress exposes applications using Services, see Service networking overview. When you create an Ingress object, the GKE Ingress controller creates a Google Cloud HTTP(S) Load Balancer and configures it according to the information in the Ingress and its associated Services."

   Source: Adapted from community discussion — syu31svc

   References

   • Google Cloud documentation
   • Google Cloud documentation

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6. Question 306 · 357 in bank

   Your company is planning to migrate their on-premises Hadoop environment to the cloud. Increasing storage cost and maintenance of data stored in HDFS is a major concern for your company. You also want to make minimal changes to existing data analytics jobs and existing architecture. How should you proceed with the migration?

   • AMigrate your data stored in Hadoop to BigQuery. Change your jobs to source their information from BigQuery instead of the on-premises Hadoop environment.
   • BCreate Compute Engine instances with HDD instead of SSD to save costs. Then perform a full migration of your existing environment into the new one in Compute Engine instances.
   • CCreate a Cloud Dataproc cluster on Google Cloud Platform, and then migrate your Hadoop environment to the new Cloud Dataproc cluster. Move your HDFS data into larger HDD disks to save on storage costs.
   • DCreate a Cloud Dataproc cluster on Google Cloud Platform, and then migrate your Hadoop code objects to the new cluster. Move your data to Cloud Storage and leverage the Cloud Dataproc connector to run jobs on that data.

   Show answer

   Answer: D

   Explanation

   https://cloud.google.com/architecture/hadoop/hadoop-gcp-migration-overview: "Keeping your data in a persistent HDFS cluster using Dataproc is more expensive than storing your data in Cloud Storage, which is what we recommend, as explained later. Keeping data in an HDFS cluster also limits your ability to use your data with other Google Cloud products." "Google Cloud includes Dataproc, which is a managed Hadoop and Spark environment. You can use Dataproc to run most of your existing jobs with minimal alteration, so you don't need to move away from all of the Hadoop tools you already know" D is the answer

   Source: Adapted from community discussion — syu31svc

   References

   • Google Cloud documentation

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7. Question 307 · 357 in bank

   Your data is stored in Cloud Storage buckets. Fellow developers have reported that data downloaded from Cloud Storage is resulting in slow API performance. You want to research the issue to provide details to the GCP support team. Which command should you run?

   • Agsutil test ג€"o output.json gs://my-bucket
   • Bgsutil perfdiag ג€"o output.json gs://my-bucket
   • Cgcloud compute scp example-instance:~/test-data ג€"o output.json gs://my-bucket
   • Dgcloud services test ג€"o output.json gs://my-bucket

   Show answer

   Answer: B

   Explanation

   B. gsutil perfdiag -o output.json gs://my-bucket The gsutil perfdiag command is used to diagnose performance issues with Cloud Storage. It can be used to perform various tests such as download, upload, and metadata operations. By using the -o flag, you can specify an output file where the results of the tests will be stored in JSON format. This output file can then be provided to the GCP support team to help them investigate the issue.

   Source: Adapted from community discussion — omermahgoub

   References

   • Google Cloud documentation

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8. Question 308 · 357 in bank

   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?

   • AUse the latest Docker image tag.
   • BUse a unique Docker image name.
   • CUse the digest of the Docker image.
   • DUse a semantic version Docker image tag.

   Show answer

   Answer: C

   Explanation

   For me it's D, it's not a best practice to use image with the latest tag. And using the semantic version will ensure that all the environment use the exact same image with the wanted code.

   Source: Adapted from community discussion — dxxdd7

   References

   • Google Cloud documentation
   • Google Cloud documentation

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9. Question 309 · 357 in bank

   Your company has created an application that uploads a report to a Cloud Storage bucket. When the report is uploaded to the bucket, you want to publish a message to a Cloud Pub/Sub topic. You want to implement a solution that will take a small amount to effort to implement. What should you do?

   • AConfigure the Cloud Storage bucket to trigger Cloud Pub/Sub notifications when objects are modified.
   • BCreate an App Engine application to receive the file; when it is received, publish a message to the Cloud Pub/Sub topic.
   • CCreate a Cloud Function that is triggered by the Cloud Storage bucket. In the Cloud Function, publish a message to the Cloud Pub/Sub topic.
   • DCreate an application deployed in a Google Kubernetes Engine cluster to receive the file; when it is received, publish a message to the Cloud Pub/Sub topic.

   Show answer

   Answer: A

   Explanation

   Since one of reqs is "You want to implement a solution that will take a small amount to effort to implement" I'd choose A because no code has to be written. However option C works great as well and is recommended by https://cloud.google.com/storage/docs/pubsub-notifications#other_notification_options.

   Source: Adapted from community discussion — donchick

   References

   • Google Cloud documentation
   • Google Cloud documentation

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10. Question 310 · 357 in bank

    Your teammate has asked you to review the code below, which is adding a credit to an account balance in Cloud Datastore. Which improvement should you suggest your teammate make?

    

    • AGet the entity with an ancestor query.
    • BGet and put the entity in a transaction.
    • CUse a strongly consistent transactional database.
    • DDon't return the account entity from the function.

    Show answer

    Answer: B

    Explanation

    https://cloud.google.com/datastore/docs/concepts/transactions#uses_for_transactions: "This requires a transaction because the value of balance in an entity may be updated by another user after this code fetches the object, but before it saves the modified object. Without a transaction, the user's request uses the value of balance prior to the other user's update, and the save overwrites the new value. With a transaction, the application is told about the other user's update." B is the answer

    Source: Adapted from community discussion — syu31svc

    References

    • Google Cloud documentation

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PCD practice, question 301. 357 questions available.