The correct answer is that the KQL query detects successful remote logon attempts from a single IP exceeding 10. This is because the query filters for Event ID 4624 (successful logon) with LogonType 10 (remote interactive), groups results by account and source IP, and then applies a count filter where the number of successful logons is greater than 10. On the Microsoft Cybersecurity Architect exam, this scenario tests your ability to distinguish between failed and successful brute-force detection—a common trap is confusing LogonType 10 with interactive console logons (Type 2) or focusing on failure events (4625) instead of successes. The key insight is that a brute-force attack can succeed, so monitoring for an unusually high volume of successful remote logins from one IP is a valid detection method. Memory tip: think “10-10-10” for LogonType 10, Event 4624, and a threshold of 10 attempts.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
SecurityEvent
| where TimeGenerated > ago(7d)
| where AccountType == "User"
| where Activity == "4624"
| where LogonType == 10
| summarize LogonAttempts = count() by Account, IPAddress
| where LogonAttempts > 10
Refer to the exhibit. A KQL query in Microsoft Sentinel is used to detect potential brute-force attacks. What does this query detect?
Refer to the exhibit.
SecurityEvent
| where TimeGenerated > ago(7d)
| where AccountType == "User"
| where Activity == "4624"
| where LogonType == 10
| summarize LogonAttempts = count() by Account, IPAddress
| where LogonAttempts > 10
A
Local logon attempts from multiple accounts
Why wrong: LogonType 10 is remote interactive, not local.
B
Failed logon attempts from multiple IPs
Why wrong: Query uses successful logon event ID 4624.
C
Successful remote logon attempts from a single IP exceeding 10
Filters for successful remote logons grouped by IP and account with count >10.
D
Failed logon attempts from a single IP
Why wrong: Query looks for successful logon events (4624).
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Successful remote logon attempts from a single IP exceeding 10
Option B is correct: The query filters for successful logon events (4624) with LogonType 10 (remote interactive), then summarizes by account and IP address, and filters for more than 10 attempts. This detects potential brute-force attacks. Option A is wrong because it looks for successful logons, not failures. Option C is wrong because it looks for remote logons (type 10). Option D is wrong because it looks for successful logons, not failures.
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.
✗
Local logon attempts from multiple accounts
Why it's wrong here
LogonType 10 is remote interactive, not local.
✗
Failed logon attempts from multiple IPs
Why it's wrong here
Query uses successful logon event ID 4624.
✓
Successful remote logon attempts from a single IP exceeding 10
Why this is correct
Filters for successful remote logons grouped by IP and account with count >10.
Related concept
Read the scenario before looking for a memorised answer.
✗
Failed logon attempts from a single IP
Why it's wrong here
Query looks for successful logon events (4624).
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 SC-100 question in full detail.
Identify which SC-100 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.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Successful remote logon attempts from a single IP exceeding 10 — Option B is correct: The query filters for successful logon events (4624) with LogonType 10 (remote interactive), then summarizes by account and IP address, and filters for more than 10 attempts. This detects potential brute-force attacks. Option A is wrong because it looks for successful logons, not failures. Option C is wrong because it looks for remote logons (type 10). Option D is wrong because it looks for successful logons, not failures.
What should I do if I get this SC-100 question wrong?
Identify which SC-100 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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