The answer is Azure Firewall, the managed cloud service designed to filter outbound internet traffic from Azure VMs. This is correct because Azure Firewall operates as a fully stateful, cloud-native firewall that inspects traffic at Layers 3 through 7, allowing you to centrally enforce application and network connectivity policies across subscriptions and virtual networks. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of which Azure service provides managed, scalable outbound filtering for VMs, often contrasting it with Network Security Groups (NSGs) which filter traffic at Layers 3-4 but lack the application-layer inspection and managed firewall capabilities. A common trap is confusing Azure Firewall with Azure Firewall Manager or NSGs—remember that only Azure Firewall offers a fully managed, stateful firewall as a service for outbound internet control. Memory tip: think "Firewall for full control, NSGs for basic rules."
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.
Which Azure networking feature allows you to filter outbound internet traffic from Azure VMs using a managed cloud firewall?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Firewall
Azure Firewall is a managed, cloud-based network security service that protects your Azure Virtual Network resources. It is a fully stateful firewall as a service with built-in high availability and unrestricted cloud scalability, allowing you to centrally create, enforce, and log application and network connectivity policies across subscriptions and virtual networks. Specifically, it can filter outbound internet traffic from Azure VMs by inspecting traffic at Layers 3-7 of the OSI model, which is precisely what the question asks for.
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 DDoS Protection
Why it's wrong here
DDoS Protection defends against volumetric inbound attacks; Azure Firewall filters all traffic directions.
✓
Azure Firewall
Why this is correct
Azure Firewall filters outbound (and inbound) traffic using FQDN, IP/port rules, and threat intelligence.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network Security Groups (outbound rules)
Why it's wrong here
NSG outbound rules provide basic filtering; Azure Firewall provides more advanced FQDN-based filtering with logging.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Network Security Groups (NSGs) with a managed firewall, but NSGs lack the centralized management, application-layer inspection, and FQDN filtering capabilities that Azure Firewall provides, making Azure Firewall the correct answer for a 'managed cloud firewall' that filters outbound internet traffic.
Detailed technical explanation
How to think about this question
Azure Firewall uses a static public IP address for outbound traffic, which simplifies whitelisting in external systems. It supports FQDN-based rules for outbound traffic, allowing you to allow or deny traffic based on fully qualified domain names (e.g., *.windowsupdate.com) rather than just IP addresses, which is critical for scenarios where IP addresses change frequently. Under the hood, Azure Firewall is built on a high-availability architecture with automatic scaling, and it integrates with Azure Monitor for logging and alerting, making it suitable for enterprise compliance and auditing requirements.
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
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-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 Firewall — Azure Firewall is a managed, cloud-based network security service that protects your Azure Virtual Network resources. It is a fully stateful firewall as a service with built-in high availability and unrestricted cloud scalability, allowing you to centrally create, enforce, and log application and network connectivity policies across subscriptions and virtual networks. Specifically, it can filter outbound internet traffic from Azure VMs by inspecting traffic at Layers 3-7 of the OSI model, which is precisely what the question asks for.
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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