PCDOE practice questions 131–140

1. Question 131 · 210 in bank

   Your company follows Site Reliability Engineering principles. You are writing a postmortem for an incident, triggered by a software change, that severely affected users. You want to prevent severe incidents from happening in the future. What should you do?

   • AIdentify engineers responsible for the incident and escalate to their senior management.
   • BEnsure that test cases that catch errors of this type are run successfully before new software releases.
   • CFollow up with the employees who reviewed the changes and prescribe practices they should follow in the future.
   • DDesign a policy that will require on-call teams to immediately call engineers and management to discuss a plan of action if an incident occurs.

   Show answer

   Answer: B

   Explanation

   I correct myself I find out this https://sre.google/sre-book/being-on-call/ Being on-call is a critical duty that many operations and engineering teams must undertake in order to keep their services reliable and available. when an incident occurs, it’s important to evaluate what went wrong, recognize what went well, and take action to prevent the same errors from recurring in the future. SRE teams must write postmortems after significant incidents and detail a full timeline of the events that occurred. I don't find anything about test cases so I go with D

   Source: Adapted from community discussion — francisco_guerra

   References

   • Google Cloud documentation

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2. Question 132 · 210 in bank

   Select 2

   You support a high-traffic web application that runs on Google Cloud Platform (GCP). You need to measure application reliability from a user perspective without making any engineering changes to it. What should you do? (Choose two.)

   • AReview current application metrics and add new ones as needed.
   • BModify the code to capture additional information for user interaction.
   • CAnalyze the web proxy logs only and capture response time of each request.
   • DCreate new synthetic clients to simulate a user journey using the application.
   • EUse current and historic Request Logs to trace customer interaction with the application.

   Show answer

   Answer: DE

   Explanation

   Web proxy is not a reverse proxy, it is a forward proxy - a type of server that runs at the client side. If you have clients from all over the world, how will you collect their proxy logs? So it cannot be C - D&E should be the answer which don't require any engineering changes "in the" application.

   Source: Adapted from community discussion — cetanx

   References

   • Google Cloud documentation
   • Google Cloud documentation

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3. Question 133 · 210 in bank

   You manage an application that is writing logs to Stackdriver Logging. You need to give some team members the ability to export logs. What should you do?

   • AGrant the team members the IAM role of logging.configWriter on Cloud IAM.
   • BConfigure Access Context Manager to allow only these members to export logs.
   • CCreate and grant a custom IAM role with the permissions logging.sinks.list and logging.sink.get.
   • DCreate an Organizational Policy in Cloud IAM to allow only these members to create log exports.

   Show answer

   Answer: A

   Explanation

   It's should be C. least privilege The question is ask about export log and does not mention about read and write log Option A give too many permission Logs Configuration Writer (roles/logging.configWriter) Provides permissions to read and write the configurations of logs-based metrics and sinks for exporting logs. logging.buckets.create logging.buckets.delete logging.buckets.get logging.buckets.list logging.buckets.undelete logging.buckets.update logging.cmekSettings.* logging.exclusions.* logging.locations.* logging.logMetrics.* logging.logServiceIndexes.* logging.logServices.* logging.logs.list logging.notificationRules.* logging.operations.* logging.sinks.* logging.views.create logging.views.delete logging.views.get logging.views.list logging.views.update resourcemanager.projects.get resourcemanager.projects.list

   Source: Adapted from community discussion — Manh

   References

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

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4. Question 134 · 210 in bank

   Your application services run in Google Kubernetes Engine (GKE). You want to make sure that only images from your centrally-managed Google Container Registry (GCR) image registry in the altostrat-images project can be deployed to the cluster while minimizing development time. What should you do?

   • ACreate a custom builder for Cloud Build that will only push images to gcr.io/altostrat-images.
   • BUse a Binary Authorization policy that includes the whitelist name pattern gcr.io/altostrat-images/.
   • CAdd logic to the deployment pipeline to check that all manifests contain only images from gcr.io/altostrat-images.
   • DAdd a tag to each image in gcr.io/altostrat-images and check that this tag is present when the image is deployed.

   Show answer

   Answer: B

   References

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

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5. Question 135 · 210 in bank

   Your team has recently deployed an NGINX-based application into Google Kubernetes Engine (GKE) and has exposed it to the public via an HTTP Google Cloud Load Balancer (GCLB) ingress. You want to scale the deployment of the application's frontend using an appropriate Service Level Indicator (SLI). What should you do?

   • AConfigure the horizontal pod autoscaler to use the average response time from the Liveness and Readiness probes.
   • BConfigure the vertical pod autoscaler in GKE and enable the cluster autoscaler to scale the cluster as pods expand.
   • CInstall the Stackdriver custom metrics adapter and configure a horizontal pod autoscaler to use the number of requests provided by the GCLB.
   • DExpose the NGINX stats endpoint and configure the horizontal pod autoscaler to use the request metrics exposed by the NGINX deployment.

   Show answer

   Answer: C

   Explanation

   C is correct A. Configure the horizontal pod autoscaler to use the average response time from the Liveness and Readiness Probes. --> using health check as a trigger of scaling is weird. if the response time of the health check is delayed, it may be caused by resources issues such as CPU, memories, and so on. so you should use such values as SLIs. B. Configure the vertical pod autoscaler in GKE and enable the cluster autoscaler to scale the cluster as pods expand. --> it doesn't referred to pod autoscaling. D. Expose the NGINX stats endpoint and configure the horizontal pod autoscaler to use the request metrics exposed by the NGINX deployment. --> if you use request metrics as SLIs, you should use custom metrics as SLIs. it is a little bit redundant.

   Source: Adapted from community discussion — kubosuke

   References

   • Google Cloud documentation
   • Google Cloud documentation

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6. Question 136 · 210 in bank

   Select 2

   Your company follows Site Reliability Engineering practices. You are the Incident Commander for a new, customer-impacting incident. You need to immediately assign two incident management roles to assist you in an effective incident response. What roles should you assign? (Choose two.)

   • AOperations Lead
   • BEngineering Lead
   • CCommunications Lead
   • DCustomer Impact Assessor
   • EExternal Customer Communications Lead

   Show answer

   Answer: AC

   Explanation

   AC https://sre.google/workbook/incident-response/ "The main roles in incident response are the Incident Commander (IC), Communications Lead (CL), and Operations or Ops Lead (OL)."

   Source: Adapted from community discussion — syslog

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7. Question 137 · 210 in bank

   You support an application running on GCP and want to configure SMS notifications to your team for the most critical alerts in Stackdriver Monitoring. You have already identified the alerting policies you want to configure this for. What should you do?

   • ADownload and configure a third-party integration between Stackdriver Monitoring and an SMS gateway. Ensure that your team members add their SMS/phone numbers to the external tool.
   • BSelect the Webhook notifications option for each alerting policy, and configure it to use a third-party integration tool. Ensure that your team members add their SMS/phone numbers to the external tool.
   • CEnsure that your team members set their SMS/phone numbers in their Stackdriver Profile. Select the SMS notification option for each alerting policy and then select the appropriate SMS/phone numbers from the list.
   • DConfigure a Slack notification for each alerting policy. Set up a Slack-to-SMS integration to send SMS messages when Slack messages are received. Ensure that your team members add their SMS/phone numbers to the external integration.

   Show answer

   Answer: C

   Explanation

   C https://cloud.google.com/monitoring/support/notification-options#creating_channels To configure SMS notifications, do the following: In the SMS section, click Add new and follow the instructions. Click Save. When you set up your alerting policy, select the SMS notification type and choose a verified phone number from the list.

   Source: Adapted from community discussion — kubosuke

   References

   • Google Cloud documentation

   Next question

8. Question 138 · 210 in bank

   You are managing an application that exposes an HTTP endpoint without using a load balancer. The latency of the HTTP responses is important for the user experience. You want to understand what HTTP latencies all of your users are experiencing. You use Stackdriver Monitoring. What should you do?

   • Aג€¢ In your application, create a metric with a metricKind set to DELTA and a valueType set to DOUBLE. ג€¢ In Stackdriver's Metrics Explorer, use a Stacked Bar graph to visualize the metric.
   • Bג€¢ In your application, create a metric with a metricKind set to CUMULATIVE and a valueType set to DOUBLE. ג€¢ In Stackdriver's Metrics Explorer, use a Line graph to visualize the metric.
   • Cג€¢ In your application, create a metric with a metricKind set to GAUGE and a valueType set to DISTRIBUTION. ג€¢ In Stackdriver's Metrics Explorer, use a Heatmap graph to visualize the metric.
   • Dג€¢ In your application, create a metric with a metricKind set to METRIC_KIND_UNSPECIFIED and a valueType set to INT64. ג€¢ In Stackdriver's Metrics Explorer, use a Stacked Area graph to visualize the metric.

   Show answer

   Answer: C

   Explanation

   Answer C Reference : https://cloud.google.com/monitoring/api/v3/kinds-and-types?hl=en GAUGE Metric : In which value measures a specific instant in time DELTA Metric : In which the value measures the change since it was last recorded CUMULATIVE metric : In which the value constantly increases over time Question asks, "Latency of HTTP responses" - This needs to be specific instant in time , which is GAUGE, hence C

   Source: Adapted from community discussion — raf2121

   References

   • Google Cloud documentation
   • Google Cloud documentation

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9. Question 139 · 210 in bank

   Your team is designing a new application for deployment both inside and outside Google Cloud Platform (GCP). You need to collect detailed metrics such as system resource utilization. You want to use centralized GCP services while minimizing the amount of work required to set up this collection system. What should you do?

   • AImport the Stackdriver Profiler package, and configure it to relay function timing data to Stackdriver for further analysis.
   • BImport the Stackdriver Debugger package, and configure the application to emit debug messages with timing information.
   • CInstrument the code using a timing library, and publish the metrics via a health check endpoint that is scraped by Stackdriver.
   • DInstall an Application Performance Monitoring (APM) tool in both locations, and configure an export to a central data storage location for analysis.

   Show answer

   Answer: A

   Explanation

   A is the answer. https://cloud.google.com/profiler/docs/about-profiler Cloud Profiler is a statistical, low-overhead profiler that continuously gathers CPU usage and memory-allocation information from your production applications.

   Source: Adapted from community discussion — zellck

   References

   • Google Cloud documentation
   • Google Cloud documentation

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10. Question 140 · 210 in bank

    You need to reduce the cost of virtual machines (VM) for your organization. After reviewing different options, you decide to leverage preemptible VM instances. Which application is suitable for preemptible VMs?

    • AA scalable in-memory caching system.
    • BThe organization's public-facing website.
    • CA distributed, eventually consistent NoSQL database cluster with sufficient quorum.
    • DA GPU-accelerated video rendering platform that retrieves and stores videos in a storage bucket.

    Show answer

    Answer: D

    Explanation

    Ans is D Video rendering service is like application type called Batch job. Therefore, we can use instance type preemptible for them. If they complete task, they could be destroy and generate new instance to work continuously next task.

    Source: Adapted from community discussion — Watcharin_start

    References

    • Google Cloud documentation

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Keyboard:J Kmove between questionsA–Dselect an answerRshow or hide the answer← →change page

PCDOE practice, question 131. 210 questions available.