This 200-201 practice question tests your understanding of security monitoring. 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.
A security analyst notices repeated failed login attempts to a critical server from a single external IP address over the past 30 minutes. The SIEM has a correlation rule that triggers an alert when the threshold of 10 failed attempts in 5 minutes is exceeded. However, no alert was generated. 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 correlation rule uses a sliding window, and the failed attempts occurred over more than 5 minutes.
Option B is correct because the SIEM correlation rule uses a sliding window that triggers an alert only when 10 failed attempts occur within a 5-minute window. Since the analyst observed repeated failed attempts over 30 minutes, the attempts are spread across multiple 5-minute windows, so no single window exceeds the threshold. This is a classic case where the event frequency is high overall but does not meet the rule's temporal aggregation criteria.
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 SIEM is not receiving logs from the authentication server.
Why it's wrong here
Logs are received, but the rule did not trigger due to time window.
✓
The correlation rule uses a sliding window, and the failed attempts occurred over more than 5 minutes.
Why this is correct
Threshold not met in any 5-minute window.
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 analyst is monitoring the wrong log source.
Why it's wrong here
Logs are correct; window aggregation is the issue.
✗
The SIEM correlation rule requires a minimum of 15 failed attempts.
Why it's wrong here
Rule threshold is 10.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between event frequency over a long period versus event rate within a specific time window, trapping candidates who assume any repeated failed login attempts will trigger an alert regardless of the correlation rule's temporal constraints.
Detailed technical explanation
How to think about this question
Sliding window correlation rules in SIEMs like Splunk or QRadar use time-based buckets (e.g., 5-minute intervals) that reset after each window; if an attacker spreads 10 attempts over 6 minutes, the rule may not fire because the first 5-minute window captures only 8 attempts and the next window captures only 2. In real-world scenarios, attackers often deliberately slow down their brute-force attempts to evade such temporal thresholds, a technique known as 'low-and-slow' attacks. Understanding the difference between fixed and sliding windows is critical for tuning detection rules to avoid false negatives.
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 practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The correlation rule uses a sliding window, and the failed attempts occurred over more than 5 minutes. — Option B is correct because the SIEM correlation rule uses a sliding window that triggers an alert only when 10 failed attempts occur within a 5-minute window. Since the analyst observed repeated failed attempts over 30 minutes, the attempts are spread across multiple 5-minute windows, so no single window exceeds the threshold. This is a classic case where the event frequency is high overall but does not meet the rule's temporal aggregation criteria.
What should I do if I get this 200-201 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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Question Discussion
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