DA0-002 Data Concepts and Environments Practice Question
A logistics company collects GPS pings from delivery trucks every few seconds. Each ping includes a device identifier, a timestamp, and latitude and longitude coordinates. The analytics team wants to compute the total distance each truck traveled per day and the average speed between consecutive pings. Which characteristic of the data must the team address first to make these calculations valid?
⚠ Common exam trap
The trap here is jumping to coordinate math or privacy handling while missing that unordered event data makes any delta calculation meaningless.
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
✓
The pings are a time series that must be ordered by timestamp per device before calculating deltas.
Distance and speed between consecutive pings are order-dependent calculations, so the pings must first be sorted by timestamp within each device to form a proper time series. Unit conversion, privacy masking, and daily aggregation are either later steps or would prevent the calculation entirely. Correct sequencing is the foundation for valid deltas.
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 pings are a time series that must be ordered by timestamp per device before calculating deltas.
Why this is correct
Distance and speed between consecutive pings depend on the order of events, so the data must be sorted by timestamp within each device before computing differences. Without correct ordering, delta calculations mix unrelated pings and produce meaningless distances. Establishing the time series sequence is the prerequisite step before any spatial or speed math can be trusted.
- ✗
The latitude and longitude values must be converted from degrees to radians before any arithmetic.
Why it's wrong here
Converting degrees to radians is necessary for some great-circle formulas, but it is a later implementation detail, not the first blocking issue. Even with correct units, unordered pings would still yield wrong distances. The primary problem is establishing the correct sequence of observations per device, after which the appropriate distance formula and units can be applied.
- ✗
The pings must be aggregated to one record per truck per day before any distance calculation.
Why it's wrong here
Aggregating to one record per truck per day would destroy the intermediate points needed to measure distance along the route. Distance between consecutive pings requires the individual observations, not a daily summary. Aggregation is a final output step, not a prerequisite, and performing it first would make the requested metrics impossible to compute.
- ✗
The device identifier must be hashed to protect driver privacy before distance is computed.
Why it's wrong here
Privacy protection such as hashing or masking device identifiers is a governance concern that may be required, but it does not affect the mathematical validity of distance or speed calculations. Hashing the identifier would still leave the ordering problem unsolved. The team must first ensure the pings are correctly sequenced per device before any computation, privacy-related or otherwise.
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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
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