Quick Answer
The answer is data classification rules. This is correct because Microsoft Purview’s data classification system uses built-in and custom classification rules to automatically detect sensitive data like credit card numbers through pattern matching and regular expressions, scanning both structured and unstructured data across Azure SQL Database, Azure Data Lake Storage, and on-premises SQL Server. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this concept tests your understanding of how Purview enforces data governance at scale, often appearing as a distractor against options like data lineage (which tracks data movement, not detection) or data catalog (which organizes metadata but relies on classification rules for sensitivity labeling). A common trap is confusing the data catalog’s role with automated detection—remember that classification rules are the engine for pattern-based sensitive data discovery. Memory tip: think “rules reveal risks”—classification rules are the detective, not the librarian.
This AZ-305 practice question tests your understanding of design infrastructure solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Your organization uses Microsoft Purview to govern data assets across Azure SQL Database, Azure Data Lake Storage, and on-premises SQL Server. You need to ensure that sensitive data such as credit card numbers are automatically detected and classified. What should you configure in Microsoft Purview?
Data share
Why wrong: Data share is for sharing data externally, not classification.
Data catalog
Why wrong: Data catalog is for metadata management; classification is a separate feature.
Data lineage mapping
Why wrong: Data lineage tracks data transformation, not sensitive data detection.
Data classification rules
Data classification rules automatically detect sensitive data using pattern matching.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Data classification rules
Option D is correct because Microsoft Purview's data classification system uses built-in and custom classification rules to automatically detect sensitive data like credit card numbers via pattern matching. Option A (Data lineage) tracks data movement, not classification. Option B (Data share) is for sharing data, not classification. Option C (Data catalog) organizes metadata but requires manual or automated classification to detect sensitive data.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Data share
Why it's wrong here
Data share is for sharing data externally, not classification.
Data catalog
Why it's wrong here
Data catalog is for metadata management; classification is a separate feature.
Data lineage mapping
Why it's wrong here
Data lineage tracks data transformation, not sensitive data detection.
Data classification rules
Why this is correct
Data classification rules automatically detect sensitive data using pattern matching.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
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
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-305 NAT questions on configuration and troubleshooting.
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FAQ
Design infrastructure solutions — This question tests Design infrastructure solutions — Static NAT maps one inside address to one outside address..
The correct answer is: Data classification rules — Option D is correct because Microsoft Purview's data classification system uses built-in and custom classification rules to automatically detect sensitive data like credit card numbers via pattern matching. Option A (Data lineage) tracks data movement, not classification. Option B (Data share) is for sharing data, not classification. Option C (Data catalog) organizes metadata but requires manual or automated classification to detect sensitive data.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-305 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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