KCNA Cloud Native Observability Practice Test 5 — 15 Questions

Question 1

Which THREE of the following are components of the OpenTelemetry project? (Select three)

Accepted Answer

OpenTelemetry API. The OpenTelemetry project includes the API, SDK, and Collector. The Agent (as a separate component) and Exporter are part of the SDK/Collector, not standalone components.

Answer

OpenTelemetry Agent

Answer

OpenTelemetry Exporter

Question 2

Which TWO of the following are common log aggregation tools used in Kubernetes environments? (Select two)

Accepted Answer

Fluentd. Fluentd and Fluent Bit are both popular log aggregators and forwarders in Kubernetes. Loki is a log storage system, not an aggregator.

Answer

Loki

Answer

Prometheus

Answer

Jaeger

Question 3

Which of the following is NOT one of the three pillars of observability?

Accepted Answer

Alerts. The three pillars are logs, metrics, and traces. Alerts are derived from these pillars but not considered a pillar themselves.

Answer

Metrics

Answer

Logs

Answer

Traces

Question 4

What is the primary purpose of structured logging?

Accepted Answer

To enable automated analysis and querying of logs. Structured logging formats log data in a consistent, machine-parseable format (e.g., JSON) with key-value pairs. This enables automated tools like Elasticsearch, Loki, or Splunk to efficiently index, search, filter, and aggregate logs, which is essential for observability at scale. The primary purpose is to facilitate automated analysis and querying, not to replace other telemetry signals or to focus on human readability alone.

Answer

To replace metrics and traces

Answer

To reduce the size of log files

Answer

To make logs human-readable only

Question 5

Which tool is commonly used for log aggregation in Kubernetes and is designed to be lightweight?

Accepted Answer

Fluent Bit. Fluent Bit is a lightweight log processor and forwarder, often used as a DaemonSet to collect logs.

Answer

Jaeger

Answer

Prometheus

Answer

Grafana

Question 6

A developer wants to view the logs of a specific container named 'sidecar' inside a pod named 'app-pod'. Which command should they use?

Accepted Answer

kubectl logs app-pod -c sidecar. The -c flag specifies the container name. The correct command is 'kubectl logs app-pod -c sidecar'.

Answer

kubectl log app-pod --container sidecar

Answer

kubectl logs app-pod sidecar

Answer

kubectl logs -c sidecar app-pod

Question 7

What type of Prometheus metric is best suited to count the total number of HTTP requests received by a service?

Accepted Answer

Counter. A counter is a cumulative metric that can only increase or be reset to zero, ideal for counting events like requests.

Answer

Histogram

Answer

Gauge

Answer

Summary

Question 8

Which of the following is true about Prometheus's pull-based model for collecting metrics?

Accepted Answer

Prometheus scrapes metrics from HTTP endpoints. Prometheus pulls metrics from targets at regular intervals, which is the pull-based model.

Answer

Targets push metrics to Prometheus

Answer

Prometheus only collects metrics from Kubernetes API server

Answer

Prometheus stores metrics in a relational database

Question 9

What is the primary role of the OpenTelemetry Collector?

Accepted Answer

To receive, process, and export telemetry data. The OpenTelemetry Collector receives, processes, and exports telemetry data to various backends.

Answer

To replace Prometheus for metric collection

Answer

To store traces and metrics long-term

Answer

To generate traces for applications

Question 10

In distributed tracing, what is a 'span'?

Accepted Answer

A single logical operation within a trace. A span represents a unit of work in a distributed system, often a single operation like an HTTP request or database call.

Answer

A metric measuring request latency

Answer

A collection of related traces

Answer

A log entry with trace context

Question 11

Which tool is specifically designed for distributed tracing and was originally developed by Uber?

Accepted Answer

Jaeger. Jaeger was originally developed by Uber for distributed tracing.

Answer

Prometheus

Answer

Loki

Answer

Grafana

Question 12

An SRE team defines an SLO that 99.9% of requests to a service should complete in under 500ms over a 30-day rolling window. If the service receives 10 million requests in a month, what is the maximum number of requests that can exceed the latency threshold while still meeting the SLO?

Accepted Answer

10,000. SLO of 99.9% means up to 0.1% errors are allowed. 0.1% of 10,000,000 is 10,000 requests.

Answer

5,000

Answer

1,000

Answer

100,000

Question 13

In PromQL, which function would you use to calculate the per-second rate of increase of a counter over a specified time window?

Accepted Answer

rate(). The rate() function calculates the per-second average rate of increase of a counter over a time range.

Answer

delta()

Answer

avg_over_time()

Answer

increase()

Question 14

What is the main advantage of using OpenTelemetry over vendor-specific instrumentation libraries?

Accepted Answer

It provides a single, vendor-agnostic instrumentation standard. OpenTelemetry provides a unified standard that avoids vendor lock-in, allowing data to be sent to any backend.

Answer

It eliminates the need for logging

Answer

It automatically reduces latency

Answer

It is the only tool that supports traces

Question 15

Which THREE of the following are benefits of using a service mesh for observability? (Select three.)

Accepted Answer

Distributed tracing across services. A service mesh provides visibility into inter-service communication, adds distributed tracing without code changes, and collects metrics like request latency.

Answer

Reduced network latency

Answer

Centralized logging of all application logs