Google ACE Ensuring Successful Operation of a Cloud Solution Practice Test 3 — 15 Questions

Question 1

You are using Cloud Run and want to split traffic so that 10% of requests go to revision v2 and 90% go to revision v1. Which command should you use?

Accepted Answer

gcloud run services update-traffic --to-revisions v1=90,v2=10. gcloud run services update-traffic allows traffic splitting between revisions.

Answer

gcloud run deploy --image my-image --traffic v1=90,v2=10

Answer

gcloud run services update --traffic v1=90,v2=10

Answer

gcloud run revisions update v2 --traffic 10

Question 2

Your application uses Pub/Sub to process orders. You notice that the subscription backlog is growing. Which tool should you use to analyze the latency of each step in the processing pipeline?

Accepted Answer

Cloud Trace. Cloud Trace provides end-to-end latency analysis across distributed services, helping identify bottlenecks.

Answer

Cloud Monitoring

Answer

Cloud Profiler

Answer

Cloud Logging

Question 3

You need to create a snapshot of a persistent disk attached to a running Compute Engine instance. The disk is used by a production database; you want minimal impact. What should you do?

Accepted Answer

Stop the instance, create the snapshot using gcloud compute disks snapshot, then restart the instance.. Creating a snapshot of a disk in use is possible, but for data consistency, it's recommended to stop the instance or at least freeze the filesystem. However, the question says 'minimal impact', so the best practice is to stop the instance. But the correct answer reflects that snapshots can be taken from attached disks, but for database consistency, stop is recommended. Let's choose the safer answer: stop the instance.

Answer

Detach the disk, create the snapshot, then reattach.

Answer

Create the snapshot while the instance is running; snapshots are always consistent.

Answer

Use gcloud compute disks snapshot without stopping; data will be consistent.

Question 4

You want to receive notifications when a specific metric exceeds a threshold. Which Cloud Monitoring resource defines the condition and the action?

Accepted Answer

Alerting policy. An alerting policy defines conditions (metric threshold) and notification channels.

Answer

Dashboard

Answer

Uptime check

Answer

Notification channel

Question 5

Your GKE cluster nodes are running low on resources. You need to enable node pool autoscaling so that the cluster automatically adds and removes nodes based on demand. The node pool is named 'default-pool'. Which command completes this task?

Accepted Answer

gcloud container node-pools update default-pool --enable-autoscaling --min-nodes 1 --max-nodes 10. gcloud container node-pools update with --enable-autoscaling enables autoscaling, and --min-nodes/--max-nodes set boundaries.

Answer

gcloud container node-pools update default-pool --autoscaling enabled

Answer

kubectl autoscale node-pool default-pool --min 1 --max 10

Answer

gcloud container clusters update my-cluster --enable-autoscaling --min-nodes 1 --max-nodes 10

Question 6

You have a Cloud Run service that you want to update to use a new container image. You also want to keep the previous revision available in case you need to roll back. Which command should you use?

Accepted Answer

gcloud run deploy my-service --image gcr.io/my-project/my-app:v2. gcloud run deploy creates a new revision and by default keeps the previous revision(s).

Answer

gcloud run revisions update my-service --image gcr.io/my-project/my-app:v2

Answer

gcloud run services update --image gcr.io/my-project/my-app:v2

Answer

kubectl set image service/my-service my-app=gcr.io/my-project/my-app:v2

Question 7

You are troubleshooting a slow application that uses multiple microservices. You suspect a particular service is causing high latency. Which TWO Google Cloud tools should you use to identify the root cause? (Select 2)

Accepted Answer

Cloud Monitoring. Cloud Trace traces requests across services to pinpoint latency, and Cloud Monitoring can show metrics like request latency and error rates.

Answer

Cloud Profiler

Answer

Cloud Logging

Answer

Cloud Debugger

Question 8

You want to create a log-based metric to count errors from your application logs. Which TWO resources are required? (Select 2)

Accepted Answer

A filter that matches the error log entries. You need a filter to match error logs and a metric descriptor that defines the metric type.

Answer

An alerting policy

Answer

A log sink

Answer

A notification channel

Question 9

You need to create a log-based metric that counts the number of errors in your application logs. What must you do first in Cloud Logging?

Accepted Answer

Define a filter that matches the error logs. In Cloud Logging, a log-based metric is based on a filter. You define the filter using the logging query language to match the logs you want to count, then create the metric from that filter.

Answer

Create an alerting policy with a condition

Answer

Create a log sink that exports logs to BigQuery

Answer

Install the Logging agent on your VMs

Question 10

You have a Compute Engine VM that is running a critical application. You need to change its machine type from n1-standard-4 to n2-standard-8. What is the correct procedure?

Accepted Answer

Stop the instance, then use gcloud compute instances set-machine-type, then start the instance. To change the machine type of a VM, you must stop the instance first, then use the gcloud compute instances set-machine-type command, and finally start the instance again.

Answer

Use gcloud compute instances update --machine-type n2-standard-8 while the instance is running

Answer

Delete the instance and create a new one with the desired machine type

Answer

Use gcloud compute instances resize --machine-type n2-standard-8 without stopping

Question 11

Your GKE cluster has a node pool that you want to enable autoscaling on. The initial node count is 3, and you want the cluster to scale between 1 and 10 nodes. Which command should you use?

Accepted Answer

gcloud container node-pools update my-pool --cluster=my-cluster --enable-autoscaling --min-nodes 1 --max-nodes 10 --region us-central1. The correct command is gcloud container node-pools update with --enable-autoscaling and the min and max node flags. The cluster name and region/zone are required.

Answer

gcloud container clusters update my-cluster --enable-autoscaling --min-nodes 1 --max-nodes 10 --region us-central1

Answer

gcloud container clusters update my-cluster --enable-autoscaling --min-size 1 --max-size 10 --region us-central1

Answer

gcloud container node-pools update my-pool --cluster=my-cluster --autoscaling --min 1 --max 10 --region us-central1

Question 12

You want to monitor the uptime of an external HTTP endpoint every minute and receive an email notification if the endpoint is unavailable for more than two consecutive checks. What should you do?

Accepted Answer

Create an uptime check in Cloud Monitoring, then create an alerting policy with condition 'metric threshold' for 'check_failed' and set notification channel to email. Uptime checks in Cloud Monitoring can be configured to check HTTP endpoints. You can set alerting conditions based on the duration of the outage and choose email as a notification channel.

Answer

Create a log-based alert in Cloud Logging that triggers on network errors

Answer

Use Cloud Functions to periodically call the endpoint and send an email on failure

Answer

Configure a TCP health check on the load balancer

Question 13

You are deploying a new revision of a Cloud Run service. You want to gradually shift traffic from the old revision to the new one, starting with 10% traffic to the new revision. Which command should you use?

Accepted Answer

gcloud run services update-traffic my-service --to-revision new-revision --percent 10. Cloud Run allows traffic splitting between revisions. The gcloud run services update-traffic command can specify the percentage of traffic for each revision.

Answer

gcloud run revisions traffic my-service --to-revision new-revision --percent 10

Answer

gcloud run services update my-service --image gcr.io/my-project/my-image:new

Answer

gcloud run deploy my-service --image gcr.io/my-project/my-image:new --traffic new-revision=10

Question 14

You need to export all Cloud Logging logs from a specific project to BigQuery for long-term analysis. What should you create?

Accepted Answer

A log sink with BigQuery as the destination. Log sinks in Cloud Logging allow you to route logs to destinations like BigQuery, Cloud Storage, or Pub/Sub. You create a sink with BigQuery as the destination.

Answer

A log-based metric with BigQuery as destination

Answer

A Pub/Sub subscription that pushes logs to BigQuery

Answer

An export job from Logging to BigQuery using gcloud logging export

Question 15

You notice that a deployment in your GKE cluster is running an outdated image. You need to update the deployment to use the new image 'gcr.io/my-project/my-app:v2'. Which kubectl command should you use?

Accepted Answer

kubectl set image deployment/my-deployment my-app=gcr.io/my-project/my-app:v2. To update the image of a deployment, use 'kubectl set image' specifying the deployment name and the container name:tag.

Answer

kubectl rollout restart deployment my-deployment --image gcr.io/my-project/my-app:v2

Answer

kubectl update deployment my-deployment --image gcr.io/my-project/my-app:v2

Answer

kubectl replace deployment my-deployment --image gcr.io/my-project/my-app:v2