The answer is that no logon events with the account name 'admin' exist in the past 7 days. This is correct because the KQL query explicitly filters for logon events where the AccountName equals 'admin' in lowercase, and it restricts the time range to the last seven days; if no such events occurred within that window, the result set will be empty by design. For the Microsoft 365 Administrator MS-102 exam, this scenario tests your understanding of how KQL query filters—especially time ranges and exact string matching—directly determine output, and it’s a common trap to assume a broader issue like onboarding or case sensitivity when the query is simply too restrictive. Remember the memory tip: “Empty results don’t mean broken filters; they mean no matching data in the time slice.”
MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. 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.
Exhibit
Refer to the exhibit.
```kql
DeviceLogonEvents
| where Timestamp > ago(7d)
| where AccountName == "admin"
| project Timestamp, DeviceName, AccountName, IPAddress
| order by Timestamp desc
```
Refer to the exhibit. An administrator runs the KQL query in Microsoft Defender for Endpoint. The result set is empty. 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.
Refer to the exhibit.
```kql
DeviceLogonEvents
| where Timestamp > ago(7d)
| where AccountName == "admin"
| project Timestamp, DeviceName, AccountName, IPAddress
| order by Timestamp desc
```
A
The device is not onboarded to Microsoft Defender for Endpoint.
Why wrong: If the device were not onboarded, the query would not return results for that device, but the query is not scoped to a specific device.
B
The query is case-sensitive and the account name is 'Admin' with a capital A.
Why wrong: While case sensitivity could cause empty results, the most likely reason is that no events exist with that account name. However, this option is plausible but less likely than C.
C
No logon events with the account name 'admin' exist in the past 7 days.
The query filters on AccountName == "admin"; if no events match, the result set is empty.
D
There are no logon events in the last 7 days.
Why wrong: Unlikely; if the device is active, there should be logon events.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No logon events with the account name 'admin' exist in the past 7 days.
The KQL query filters for logon events where the AccountName equals 'admin' (lowercase). If no such events occurred in the last 7 days, the result set will be empty. This is the most likely reason because the query explicitly restricts the time range and account name, and an empty result does not indicate a broader issue with onboarding or case sensitivity.
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 device is not onboarded to Microsoft Defender for Endpoint.
Why it's wrong here
If the device were not onboarded, the query would not return results for that device, but the query is not scoped to a specific device.
✗
The query is case-sensitive and the account name is 'Admin' with a capital A.
Why it's wrong here
While case sensitivity could cause empty results, the most likely reason is that no events exist with that account name. However, this option is plausible but less likely than C.
✓
No logon events with the account name 'admin' exist in the past 7 days.
Why this is correct
The query filters on AccountName == "admin"; if no events match, the result set is empty.
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.
✗
There are no logon events in the last 7 days.
Why it's wrong here
Unlikely; if the device is active, there should be logon events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume an empty result set always indicates a configuration or onboarding problem, rather than recognizing that the query's specific filter (account name and time range) simply returned no matching data.
Detailed technical explanation
How to think about this question
In Microsoft Defender for Endpoint, KQL queries against the DeviceLogonEvents table are case-sensitive for string comparisons. The query uses the 'where' operator to filter on AccountName, and if the exact string 'admin' does not appear in any event within the specified time range (last 7 days), the result set is empty. This is a common scenario when auditing specific accounts; the time range is set by the 'Timestamp' column and the 'ago(7d)' function, which calculates a 7-day lookback from the current time.
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.
TExam Day Tips
→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.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: No logon events with the account name 'admin' exist in the past 7 days. — The KQL query filters for logon events where the AccountName equals 'admin' (lowercase). If no such events occurred in the last 7 days, the result set will be empty. This is the most likely reason because the query explicitly restricts the time range and account name, and an empty result does not indicate a broader issue with onboarding or case sensitivity.
What should I do if I get this MS-102 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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