DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
You are using Azure Purview to scan an Azure Data Lake Storage Gen2 account. After scanning, you notice that some files are not classified. What is the most likely reason?
⚠ Common exam trap
DP-203 often tests the assumption that a completed scan means all files are classified, when in fact the scan rule set's file type inclusion determines what gets classified.
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 file types are not included in the scan rule set
Azure Purview scans use a scan rule set that defines which file types are included for classification. If a file's extension or type is not listed in the rule set, Purview skips classification for that file even though the scan completes. This is the most common reason specific files remain unclassified after a successful scan.
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 storage account is not registered in Purview
Why it's wrong here
An unregistered storage account produces no scan results at all, so no files would appear in Purview; the stem shows a completed scan with only some files unclassified. Registration is the prerequisite step when onboarding a new data source before any scanning can begin.
- ✗
The files are in Parquet format
Why it's wrong here
Purview classifies Parquet by reading its schema and column values, so the format alone does not prevent classification. Parquet is the right choice when you need columnar, schema-aware scanning of structured analytical data rather than delimited text files.
- ✗
The classification rules are disabled
Why it's wrong here
Disabled classification rules would leave every scanned file unclassified, not merely some; the stem's partial gap points to unsupported file types or formats instead. Rules are genuinely disabled when you deliberately want a scan to catalogue assets without applying sensitivity labels, for example during initial inventory discovery.
- ✓
The file types are not included in the scan rule set
Why this is correct
Purview only classifies file extensions covered by the scan rule set's classification rules. Files whose types fall outside that set are scanned for schema but never matched against classification patterns, so they remain unclassified despite a successful scan.
Go deeper
Related to this question
About these practice questions
Courseiva writes every DP-203 question from scratch — 509 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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 Microsoft exam blueprint
This DP-203 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-203 exam.