312-39 Incident Detection And Triage Practice Question
You are designing a correlation rule in Microsoft Sentinel to detect lateral movement. You decide to use KQL to join 'SecurityEvent' and 'SigninLogs'. What is the primary benefit of using a join over a union in this scenario?
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
✓
Joins allow matching records between two datasets based on a common field.
Joins allow for the association of different data types based on common entities like IP addresses or hostnames.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Unions only support structured data.
Why it's wrong here
Both support structured data.
- ✓
Joins allow matching records between two datasets based on a common field.
Why this is correct
Joins are essential for correlating disparate data sources.
- ✗
Joins consume less memory than unions.
Why it's wrong here
Joins are generally more resource-intensive.
- ✗
Unions cannot be used in detection rules.
Why it's wrong here
Unions are frequently used in detection rules.
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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.