The correct choice is to use a custom skill in the skillset to detect and redact PII before indexing. This works because Azure AI Search’s enrichment pipeline allows you to integrate a custom skill—such as one leveraging Azure Cognitive Services for PII detection—that processes documents during the indexing phase, removing or masking sensitive fields like names, social security numbers, or email addresses before they are written to the search index. On the AI-102 exam, this scenario tests your understanding of the knowledge mining lifecycle, specifically how to safeguard sensitive data within the enrichment pipeline rather than relying on post-index controls. A common trap is confusing encryption or access control with content redaction; encryption protects data at rest but does not strip PII from search results, while access control only limits who can query the index. Remember the pipeline principle: redact before you index, not after. A useful memory tip is “Redact in the pipeline, protect the index line.”
AI-102 Practice Question: Implement knowledge mining and information extraction solutions
This AI-102 practice question tests your understanding of implement knowledge mining and information extraction solutions. 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.
You are designing a knowledge mining solution that must handle sensitive customer data. The solution must ensure that personally identifiable information (PII) is not returned in search results. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a custom skill in the skillset to detect and redact PII before indexing
Option B is correct because enabling PII detection in the enrichment pipeline and using a custom skill to remove or mask PII fields before indexing prevents PII from being stored in the index. Option A is wrong because encryption does not prevent PII from being returned in results. Option C is wrong because field mappings control how fields are imported, not content removal. Option D is wrong because access control restricts who can search but does not remove PII from results.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use Azure AI Search with encryption at rest
Why it's wrong here
Encryption protects data at rest but does not filter results.
✗
Implement role-based access control on the search index
Why it's wrong here
Access control does not remove PII; it only restricts who can search.
✓
Use a custom skill in the skillset to detect and redact PII before indexing
Why this is correct
Redacting PII in the enrichment pipeline prevents it from appearing in search results.
Field mappings exclude fields, but PII may be in unstructured text.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AI-102 subnetting questions on CIDR, address ranges, and subnet selection.
Implement knowledge mining and information extraction solutions — This question tests Implement knowledge mining and information extraction solutions — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use a custom skill in the skillset to detect and redact PII before indexing — Option B is correct because enabling PII detection in the enrichment pipeline and using a custom skill to remove or mask PII fields before indexing prevents PII from being stored in the index. Option A is wrong because encryption does not prevent PII from being returned in results. Option C is wrong because field mappings control how fields are imported, not content removal. Option D is wrong because access control restricts who can search but does not remove PII from results.
What should I do if I get this AI-102 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AI-102 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You need to extract personally identifiable information (PII) from a set of text documents before indexing them in Azure AI Search. The PII must be redacted. Which Azure AI service and configuration should you use?
medium
A.Use the entity recognition skill in Azure AI Search and map to a target field
B.Use Azure AI Document Intelligence with a custom model to identify PII fields
✓ C.Use the built-in PII detection skill in Azure AI Search with redaction mode enabled
D.Use Azure AI Language's key phrase extraction to find PII
Why C: Option A is correct because Azure AI Language's PII detection skill can redact PII. Options B and D do not redact. Option C is for form extraction.
Last reviewed: Jun 20, 2026
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