This AZ-500 practice question tests your understanding of secure networking. 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 has an Azure virtual network with multiple subnets hosting different application tiers. They need to inspect and filter all outbound traffic from VMs to the internet, and they must be able to allow or deny traffic based on fully qualified domain names (FQDNs). Which Azure networking service should they deploy?
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 can inspect and filter outbound traffic from Azure virtual networks to the internet. It supports application rules based on fully qualified domain names (FQDNs), allowing or denying traffic by FQDN, which directly meets the requirement. Unlike simpler filtering options, Azure Firewall provides stateful inspection and integrates with Azure Monitor for logging.
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 this is correct
Correct. Azure Firewall provides application-level filtering based on FQDNs for outbound traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network Security Groups (NSGs).
Why it's wrong here
NSGs can only filter based on IP addresses, ports, and protocols; they do not support FQDN filtering.
✗
Azure Application Gateway.
Why it's wrong here
Application Gateway is a layer-7 load balancer for inbound web traffic, not outbound inspection.
✗
Azure VPN Gateway.
Why it's wrong here
VPNGateway creates encrypted tunnels, not traffic inspection or filtering.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Network Security Groups (NSGs) with Azure Firewall, assuming NSGs can filter by FQDN because they support service tags, but service tags are IP-based and do not allow granular FQDN-level control.
Detailed technical explanation
How to think about this question
Azure Firewall uses a combination of network rules (Layer 3/4) and application rules (Layer 7) to enforce policies. For FQDN filtering, it performs DNS resolution and matches the resolved IP addresses against the rule collection, but it also supports TLS inspection (when configured) to inspect encrypted traffic. In a real-world scenario, you might combine Azure Firewall with Azure Firewall Manager for centralized policy management across multiple virtual networks.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Secure networking — This question tests Secure networking — 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 can inspect and filter outbound traffic from Azure virtual networks to the internet. It supports application rules based on fully qualified domain names (FQDNs), allowing or denying traffic by FQDN, which directly meets the requirement. Unlike simpler filtering options, Azure Firewall provides stateful inspection and integrates with Azure Monitor for logging.
What should I do if I get this AZ-500 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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