DA0-002 Visualization and Reporting Practice Question
A company uses a dashboard to monitor server uptime. The data is collected every minute, but the dashboard only refreshes every hour. Users see gaps in the line chart. What is the most likely cause, and how should it be fixed?
⚠ Common exam trap
DA0-002 often tests whether candidates blame the chart type or missing data when the real issue is a refresh-cadence mismatch between the data source and the visualization.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the dashboard refresh rate to match data collection frequency
The dashboard refreshes hourly while data arrives every minute, so between refreshes the chart shows only the last-fetched snapshot and appears to have gaps or stale segments. Aligning the dashboard refresh interval with the data collection frequency (or at least much closer to it) ensures the chart reflects the continuous stream of one-minute data points.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The line chart should interpolate missing data points
Why it's wrong here
Interpolation fabricates values between plotted points instead of retrieving the minute-level samples the dashboard never queried, masking rather than fixing the gap. Interpolation suits sparse but complete datasets, not a refresh interval that discards collected data.
- ✗
Switch to a bar chart to avoid gaps
Why it's wrong here
Bar charts plot the same aggregated points as line charts, so the hourly refresh still drops the intervening minute-level samples and gaps persist. Switching chart type is a presentation choice, appropriate when comparing discrete categories rather than showing a continuous time series.
- ✓
Increase the dashboard refresh rate to match data collection frequency
Why this is correct
The chart plots minute-level data but redraws hourly, so intermediate points are never rendered, producing visible gaps. Raising the dashboard refresh rate to match the one-minute collection interval ensures each recorded value appears, eliminating the apparent discontinuity.
- ✗
Use a different data series with the same refresh rate
Why it's wrong here
Changing the series does not reconcile the one-minute collection interval with the hourly dashboard refresh, so the chart still omits intermediate points. Selecting a series with a matching refresh rate is relevant only when the underlying data itself is sampled hourly, not when collection outpaces rendering.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.