Datadog APM and Distributed Tracing Fundamentals 시험 - Datadog실제시험문제와 답 - 70문항

Question No : 1

Deployment tracking is useful for monitoring which deployment strategy?

A.Rolling deploys
B.Blue and green deploys
C.Canary deploys
D.Rolling and canary deploys
E.All of the choices are correct.

정답:
Explanation:
Deployment tracking supports all the mentioned deployment strategies.
For more information, see: https://docs.datadoghq.com/tracing/services/deployment_tracking/#deployment-strategies

Question No : 2

How do you monitor shadow deployments with APM?

A.Tag shadows with a version tag to compare error rates between the two versions to determine if the shadow version should be released.
B.Tag shadows with a shadow: true tag to aggregate latencies across all shadows to determine if the production version should be deprecated.
C.Tag shadows with a source tag to compare service behavior between the two sources to determine if the infrastructure configuration should be released.

정답:
Explanation:
Shadow deployment is when a release candidate version is deployed alongside the production version. Incoming traffic is sent to both. Shadow deploys test a potential release against real production traffic. Tagging shadows with a version tag lets you compare error rates, traces, and service behavior between the two versions to determine if the shadow version should be released.
See: https://docs.datadoghq.com/tracing/services/deployment_tracking/#shadow-deploys

Question No : 3

Which service would have the highest request duration for a single request?

A.The one with the highest p100 latency.
B.The one with the highest p99 latency.
C.The one with the highest error rate.
D.The one with the highest requests.

정답:
Explanation:
p100 latency or the 100th percentile latency is the largest value in the ordered list of latencies observed.
More information on Service Catalog here: https://docs.datadoghq.com/tracing/service_catalog/#performance-view

Question No : 4

To find the slowest endpoint of a web service, you need to navigate to the service page and arrange the resources by which column?

A.requests
B.total time
C.p99 latency
D.error rate

정답:
Explanation:
Slowness of an endpoint would correspond to latency. More information here: https://docs.datadoghq.com/tracing/services/service_page/#resources

Question No : 5

The trace view indicates that the rack.request span is taking 7.53 seconds to execute with an indicator of p94.
What can we conclude from this information?

A.This span's duration is slower than average.
B.This span's duration is faster than average.
C.This span's duration is around the general average.

정답:
Explanation:
p94 means that assuming 100 spans, this span would be the 94th largest. More information on Trace View here: https://docs.datadoghq.com/tracing/trace_explorer/trace_view/?tab=spantags

Question No : 6

What is error tracking for APM useful for?

A.Setting alerts on fatal issues that may occur.
B.Grouping similar errors into issues to reduce noise.
C.Following issues over time.
D.All are correct.

정답:
Explanation:
Error Tracking enables you to set alerts to remain informed of fatal issues that may occur, group similar errors into issues to easily identify important errors and reduce noise, and follow issues over time to know when they first started, if they are still ongoing, and how often they are occurring.
See: https://docs.datadoghq.com/tracing/error_tracking/

Question No : 7

Which view is best for checking sets of errors over time to know when they first started, if they are still ongoing, and how often they are occurring?

A.Error Tracking
B.Service Page
C.Trace Explorer
D.Service List

정답:
Explanation:
Error Tracking enables you to group errors into issues, and follow issues over time to know when they first started, if they are still ongoing, and how often they are occurring.
See: https://docs.datadoghq.com/tracing/error_tracking/

Question No : 8

Given the span summary, which column should you check to determine which resource had the most errors encountered?

A.AVG % EXEC TIME
B.AVG DURATION
C.ERROR RATE
D.SERVICE NAME

정답:
Explanation:
The error rate will tell you which part of the trace encounters a lot of errors.

Question No : 9

How long are traces retained?

A.7 days
B.15 days
C.1 month
D.Depends on the contract plan

정답:
Explanation:
Trace retention corresponds to indexed spans. The default retention for indexed spans depends on the plan agreed upon in your Datadog contract.
See: https://docs.datadoghq.com/developers/guide/data-collection-resolution-retention/

Question No : 10

What is the benefit of using Watchdog AI in Datadog's APM and observability platform?

A.To improve code performance in any environment, including production
B.To provide high-granularity data and custom metrics in real time
C.To suggest root cause analyses for unanticipated outliers
D.To improve on key metrics to prevent outages and errors

정답:
Explanation:
Watchdog AI has features to automatically detect unanticipated outliers and resolve incidents faster with instant root cause analyses.
See: https://www.datadoghq.com/dg/apm/benefits-os-b/

Question No : 11

What information do tracer debug logs contain?

A.Whether or not traces were sent to the Datadog Agent
B.Whether or not the application has high load
C.Whether or not the Datadog Agent has high load
D.All the choices are included in tracer debug logs.

정답:
Explanation:
The tracer debug logs contain information for diagnosing tracer issues or audit trace data. It does not include information about the load on the Datadog Agent nor the application being monitored. The best answer is whether or not traces were sent to the Datadog Agent.
See: https://docs.datadoghq.com/tracing/troubleshooting/tracer_debug_logs/

Question No : 12

When monitoring applications in a containerized environment, where are the tracer debug logs usually located?

A.In the Datadog Agent container
B.In the application container
C.Both Agent and app containers.

정답:
Explanation:
The tracer debug logs would be with the application, not the Agent. These logs are not sent to the Datadog Agent in the flare and are stored in a separate path depending on your logging configuration.
See: https://docs.datadoghq.com/tracing/troubleshooting/tracer_debug_logs/

Question No : 13

What is a span in APM?

A.A particular t of work in a distributed system for a given time period
B.A tool to troubleshoot application performance
C.A building block of modern microservice architectures

정답:

Question No : 14

What is the purpose of Resources in Datadog APM?

A.To group together endpoints, queries, or jobs
B.To track the time spent by an application processing a request
C.To show an aggregate view of spans for all traces
D.To represent a particular icular g/glossary/#resources

정답:

Question No : 15

What are services in a microservice architecture?

A.The building blocks of an application
B.A particular method for a request to a service

정답:
Explanation:
Services are the building blocks of modern microservice architectures - broadly a service groups together endpoints, queries, or jobs for the purposes of building your application.
See: https://docs.datadoghq.com/tracing/glossary/#services

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