The answer is Microsoft Sentinel, because it is the only Azure service that delivers full SIEM capabilities for centralized log management and real-time security event analysis across hybrid environments. While Azure Monitor and Log Analytics handle metrics and operational logs, they lack the built-in correlation engine and threat intelligence needed to detect anomalous behavior and trigger custom alerts, which are core SIEM functions. On the AZ-305 exam, this question tests your ability to distinguish between monitoring services: a common trap is choosing Azure Monitor for its log collection features, but remember that Sentinel sits on top of Log Analytics workspaces to add security-specific analytics and automated response. Microsoft Defender for Cloud focuses on hardening security posture and vulnerability management, not on ingesting and analyzing logs from multiple sources for SIEM. For a quick memory tip, think “Sentinel = Security + SIEM,” where the “S” stands for both security and the centralized log storage that enables real-time hunting and alerting.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
You need to design a monitoring solution for a set of Azure virtual machines running a business-critical application. The solution must provide centralized log management, enable real-time analysis of security events, and support custom alerts for anomalous behavior. Which Azure service should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Sentinel
Option C is correct because Microsoft Sentinel provides SIEM capabilities for centralized log management, real-time analysis, and custom alerts. Option A (Azure Monitor) is for metrics and logs but lacks SIEM. Option B (Log Analytics) is a component of Azure Monitor. Option D (Microsoft Defender for Cloud) focuses on security posture and threat protection.
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.
✗
Azure Log Analytics
Why it's wrong here
Log Analytics is a data store and query tool, not a full SIEM.
✗
Microsoft Defender for Cloud
Why it's wrong here
Defender for Cloud provides security recommendations and threat protection, not centralized log management.
✗
Azure Monitor
Why it's wrong here
Azure Monitor provides monitoring but not SIEM capabilities for security event analysis.
✓
Microsoft Sentinel
Why this is correct
Microsoft Sentinel is a cloud-native SIEM that provides log management, analysis, and custom alerts.
Related concept
Read the scenario before looking for a memorised answer.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Identify which AZ-305 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 infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Sentinel — Option C is correct because Microsoft Sentinel provides SIEM capabilities for centralized log management, real-time analysis, and custom alerts. Option A (Azure Monitor) is for metrics and logs but lacks SIEM. Option B (Log Analytics) is a component of Azure Monitor. Option D (Microsoft Defender for Cloud) focuses on security posture and threat protection.
What should I do if I get this AZ-305 question wrong?
Identify which AZ-305 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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This AZ-305 practice question is part of Courseiva's free Microsoft 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 AZ-305 exam.
Question Discussion
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