The answer is that the query filters on UserPrincipalName incorrectly, which is the most likely reason your KQL query returns zero results for user@contoso.com. In Microsoft Sentinel, the UserPrincipalName field is not always present in sign-in logs; instead, the actual data may store the user identifier under a different column such as UserId, AccountUpn, or even a truncated format. This mismatch causes the filter to miss the records entirely, even though failed sign-in attempts exist within the last 30 days. On the MS-102 exam, this question tests your ability to troubleshoot KQL queries by recognizing common schema pitfalls, a frequent trap where candidates assume field names match their expectations. A reliable memory tip is to always check the actual log schema using the “Get-Schema” operator or review the Identity column before filtering—remember “UPN is not always the key.”
MS-102 Practice Question: Implement and manage Microsoft Entra identity and access
This MS-102 practice question tests your understanding of implement and manage microsoft entra identity and access. 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.
Exhibit
Refer to the exhibit.
```kusto
SigninLogs
| where TimeGenerated > ago(30d)
| where UserPrincipalName == "user@contoso.com"
| summarize TotalAttempts = count(), FailedAttempts = countif(ResultType != 0), Locations = make_set(Location) by AppDisplayName
| where FailedAttempts > 0
```
Refer to the exhibit. You run the KQL query in Microsoft Sentinel. The query returns zero results even though you know user@contoso.com has had failed sign-in attempts in the last 30 days. What is the most likely reason?
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 query filters on UserPrincipalName incorrectly
Option D is correct because the query filters by UserPrincipalName, which may not match the actual data field (e.g., it could be UserId or different format). Option A is wrong because the query uses ago(30d). Option B is wrong because the query includes all results. Option C is wrong because the query uses summarize correctly.
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 query uses ago(30d) but the data retention is only 7 days
Why it's wrong here
If retention were 7 days, the query would return data for the last 7 days, not zero.
✗
The summarize statement is incorrect
Why it's wrong here
The summarize syntax is correct.
✓
The query filters on UserPrincipalName incorrectly
Why this is correct
The field might be named differently, e.g., UserId or UPN.
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 query excludes successful sign-ins
Why it's wrong here
The query includes failed attempts only.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Identify which MS-102 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.
Implement and manage Microsoft Entra identity and access — This question tests Implement and manage Microsoft Entra identity and access — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The query filters on UserPrincipalName incorrectly — Option D is correct because the query filters by UserPrincipalName, which may not match the actual data field (e.g., it could be UserId or different format). Option A is wrong because the query uses ago(30d). Option B is wrong because the query includes all results. Option C is wrong because the query uses summarize correctly.
What should I do if I get this MS-102 question wrong?
Identify which MS-102 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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