The answer is Azure DDoS Protection Standard. This is the correct choice because it provides dedicated mitigation against Distributed Denial of Service (DDoS) attacks at the network layer (Layer 3/4), which directly protects Azure VMs by monitoring and automatically scrubbing malicious traffic targeting their public IP addresses without requiring any application changes. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of Azure’s network security services, often appearing as a scenario where you must distinguish between Azure DDoS Protection Standard and Basic—remember that Basic is always enabled but offers no adaptive tuning or cost protection, while Standard is the paid, enterprise-grade service for volumetric attacks. A common trap is confusing it with Azure Firewall or Network Security Groups, which filter traffic but do not handle large-scale DDoS mitigation. Memory tip: think “Standard shields the stack” — Standard defends the network stack (Layer 3/4) against volumetric floods.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
A company needs to protect their Azure VMs from DDoS attacks at the network layer. Which Azure service provides this protection?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure DDoS Protection Standard
Azure DDoS Protection Standard is the correct service because it provides dedicated mitigation against Distributed Denial of Service (DDoS) attacks targeting Azure virtual machines at the network layer (Layer 3/4). It uses adaptive tuning, traffic monitoring, and automatic attack mitigation to protect public IP addresses associated with Azure resources, including VMs, without requiring any application-level changes.
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 Firewall
Why it's wrong here
Azure Firewall provides stateful packet inspection but DDoS Protection Standard is purpose-built for volumetric DDoS attack mitigation.
✓
Azure DDoS Protection Standard
Why this is correct
DDoS Protection Standard provides enhanced protection against volumetric DDoS attacks for Azure resources with automatic mitigation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network Security Groups
Why it's wrong here
NSGs control traffic based on rules but cannot absorb or mitigate large-scale DDoS attacks.
✗
Azure WAF
Why it's wrong here
WAF protects against web application attacks (OWASP Top 10) — DDoS Protection handles volumetric network-layer attacks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Firewall or NSGs with DDoS protection because they both filter traffic, but they serve fundamentally different purposes—access control versus volumetric attack mitigation—and only DDoS Protection Standard handles network-layer DDoS attacks.
Detailed technical explanation
How to think about this question
Azure DDoS Protection Standard leverages Azure’s global network capacity to absorb and scrub attack traffic, using real-time telemetry and machine learning to distinguish legitimate traffic from attack patterns. It integrates with Azure Monitor to provide metrics and alerts, and its adaptive tuning automatically adjusts thresholds based on historical traffic patterns for each protected public IP. In a real-world scenario, a volumetric SYN flood targeting a VM’s public IP would be detected and mitigated at the Azure edge before reaching the VM, while NSGs or Azure Firewall would only see the already-saturated link.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure DDoS Protection Standard — Azure DDoS Protection Standard is the correct service because it provides dedicated mitigation against Distributed Denial of Service (DDoS) attacks targeting Azure virtual machines at the network layer (Layer 3/4). It uses adaptive tuning, traffic monitoring, and automatic attack mitigation to protect public IP addresses associated with Azure resources, including VMs, without requiring any application-level changes.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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