- A
Structured data
Why wrong: Structured data adheres to a strict schema with fixed fields and data types, such as a relational table. JSON allows for flexible and nested fields, which makes it semi-structured, not fully structured.
- B
Semi-structured data
JSON is a classic example of semi-structured data. It uses key-value pairs and can have nested structures, but it does not enforce a rigid schema. This flexibility is ideal for IoT payloads where fields may vary over time.
- C
Unstructured data
Why wrong: Unstructured data lacks a predefined data model or organization, such as a video file or raw text. JSON has a defined format (key-value pairs) and is not considered unstructured.
- D
Relational data
Why wrong: Relational data refers to data stored in tables with rows and columns, typically using a fixed schema. JSON does not fit this definition because it is not tabular and can have varying keys across different payloads.
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A retail company receives real-time data from IoT sensors in its warehouses. Each sensor sends a JSON payload containing a device ID, timestamp, and temperature reading. A data engineer needs to classify this data for storage planning. Which data type best describes the JSON payload?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Semi-structured data
The JSON payload is considered semi-structured data because it has organizational properties (key-value pairs, nested structure) that provide a schema, but it does not conform to a rigid tabular schema like a relational database. JSON allows flexible fields and varying data types, which is characteristic of semi-structured data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Structured data
Why it's wrong here
Structured data adheres to a strict schema with fixed fields and data types, such as a relational table. JSON allows for flexible and nested fields, which makes it semi-structured, not fully structured.
- ✓
Semi-structured data
Why this is correct
JSON is a classic example of semi-structured data. It uses key-value pairs and can have nested structures, but it does not enforce a rigid schema. This flexibility is ideal for IoT payloads where fields may vary over time.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Unstructured data
Why it's wrong here
Unstructured data lacks a predefined data model or organization, such as a video file or raw text. JSON has a defined format (key-value pairs) and is not considered unstructured.
- ✗
Relational data
Why it's wrong here
Relational data refers to data stored in tables with rows and columns, typically using a fixed schema. JSON does not fit this definition because it is not tabular and can have varying keys across different payloads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'structured' with 'has a format' — JSON has a clear structure, but it is not rigidly tabular, so it falls under semi-structured, not structured data.
Detailed technical explanation
How to think about this question
JSON (JavaScript Object Notation) uses a lightweight, text-based format with key-value pairs and arrays, defined by RFC 8259. Unlike structured data in a SQL table, JSON can have varying fields per object (e.g., one sensor payload may include 'humidity' while another does not), making it semi-structured. In real-world IoT scenarios, JSON is often ingested into NoSQL databases like Azure Cosmos DB, which natively support schema flexibility and indexing on nested fields.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Describe core data concepts — study guide chapter
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FAQ
Questions learners often ask
What does this DP-900 question test?
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Semi-structured data — The JSON payload is considered semi-structured data because it has organizational properties (key-value pairs, nested structure) that provide a schema, but it does not conform to a rigid tabular schema like a relational database. JSON allows flexible fields and varying data types, which is characteristic of semi-structured data.
What should I do if I get this DP-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DP-900 practice question is part of Courseiva's free Microsoft 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 DP-900 exam.
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