The answer is that the ADX cluster does not have a managed identity enabled for Purview. This is the most likely cause because Microsoft Purview authenticates to Azure Data Explorer using a system-assigned or user-assigned managed identity, which must be explicitly enabled on the cluster and granted the appropriate permissions, such as the AllDatabasesViewer role. Without this identity, Purview cannot authenticate, resulting in the specific authentication error described. On the DP-203 exam, this scenario tests your understanding of how Purview integrates with Azure data sources via managed identities, a common trap where candidates overlook enabling the identity itself and focus instead on firewall rules or network settings. Remember that authentication failures in Purview scans almost always point back to missing or misconfigured managed identity permissions, not connectivity issues. A useful memory tip: “No identity, no entry” — Purview needs its own key to unlock the ADX cluster.
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 configuring Microsoft Purview to scan an Azure Data Explorer (ADX) cluster. You define the JSON shown in the exhibit. However, the scan fails with an authentication error. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ADX cluster does not have a managed identity enabled for Purview.
Option C is correct because Purview requires a system-assigned managed identity (or user-assigned) to be enabled on the ADX cluster and granted permissions. Option A (firewall) could be a cause, but the error is authentication specifically. Option B (region mismatch) is not a common issue. Option D (incorrect database) would cause a different error.
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.
✗
The ADX cluster is behind a firewall and Purview cannot connect.
Why it's wrong here
Firewall would cause a connection error, not authentication.
✗
The database name in the scan configuration is incorrect.
Why it's wrong here
Incorrect database would cause a 'database not found' error.
✓
The ADX cluster does not have a managed identity enabled for Purview.
Why this is correct
Purview uses managed identity for authentication; it must be enabled.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The region of the ADX cluster does not match the Purview account region.
Why it's wrong here
Region mismatch does not cause authentication errors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Identify which DP-203 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ADX cluster does not have a managed identity enabled for Purview. — Option C is correct because Purview requires a system-assigned managed identity (or user-assigned) to be enabled on the ADX cluster and granted permissions. Option A (firewall) could be a cause, but the error is authentication specifically. Option B (region mismatch) is not a common issue. Option D (incorrect database) would cause a different error.
What should I do if I get this DP-203 question wrong?
Identify which DP-203 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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