312-39 Incident Detection And Triage Practice Question
You are designing a rule in a SIEM to detect brute force attacks. What is the most important factor when choosing the time window for the rule?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The rate of attempts compared to the attacker's potential speed.
The time window must be long enough to capture slow-and-low attacks but short enough to avoid excessive false positives.
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 number of log sources in the SIEM.
Why it's wrong here
The number of sources is irrelevant to the time window.
- ✗
The time of day the rule runs.
Why it's wrong here
Rules should be time-agnostic.
- ✓
The rate of attempts compared to the attacker's potential speed.
Why this is correct
Matching the window to the attack methodology ensures detection.
- ✗
The disk space available in the SIEM.
Why it's wrong here
Disk space is not a consideration for rule logic.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official EC-Council exam blueprint
This 312-39 practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 312-39 exam.