3.1 Balancing Change, Velocity, and Reliability of the Service PROFESSIONAL-CLOUD-DEVOPS-ENGINEER Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A team is deciding between two SLOs for a new service: 99.9% and 99.99% availability over a 30-day month. They estimate that achieving 99.99% would require a significant investment in redundancy. What is the difference in allowable downtime per month between the two SLOs?

   • A99.9% allows 8.64 minutes, 99.99% allows 0.864 minutes.
   • B99.9% allows 432 minutes, 99.99% allows 43.2 minutes.
   • C99.9% allows 43.2 minutes, 99.99% allows 4.32 minutes.
   • D99.9% allows 4.32 minutes, 99.99% allows 43.2 minutes.
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2. 7application · medium

   A cloud provider offers a service with an SLA of 99.95% availability. A customer's application depends on this service. The customer's SRE team sets an internal SLO of 99.99% for the application. What is the primary reason for setting the SLO higher than the SLA?

   • ATo ensure that the application can meet the SLA even if the provider has an outage.
   • BTo reduce the cost of the service by negotiating a lower SLA.
   • CTo align the SLO with the SLA to avoid confusion.
   • DTo make the error budget smaller so that the team is more careful.
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4. 8foundation · easy

   Why are SLOs typically defined for user-facing services?

   • ATo replace the need for monitoring and alerting by establishing fixed performance thresholds.
   • BTo guarantee that the service will never experience downtime or performance degradation.
   • CTo satisfy legal requirements that all public services must publish reliability targets.
   • DTo provide a precise, measurable target that aligns engineering efforts with user expectations of reliability.
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5. 9foundation · easy

   What does an SLO (Service Level Objective) specify for a service?

   • AA contractual agreement between a provider and customer that includes penalties for non-compliance.
   • BA target value for a service level indicator, such as availability or latency, over a defined period.
   • CA raw measurement of a specific aspect of service performance, such as request latency or error rate.
   • DA budget of allowable errors or downtime that a service can consume before the SLO is at risk.
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6. 10application · medium

   A team manages an online document editing service. They want to define an SLI for user-facing availability. Which metric is the most appropriate to use?

   • AThe percentage of database queries that complete successfully.
   • BThe percentage of successful HTTP requests to the backend API.
   • CThe percentage of user sessions that successfully load and save a document without error.
   • DThe percentage of server uptime as reported by the cloud provider.
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