The answer is an Application Rule, because Azure Firewall uses this rule type to filter outbound HTTPS traffic based on fully qualified domain names (FQDNs). Application Rules inspect the TLS Server Name Indication (SNI) extension within the HTTPS handshake, allowing the firewall to match the target FQDN—such as *.microsoft.com or *.windowsupdate.com—and make granular allow or deny decisions for web traffic. On the AZ-500 exam, this concept tests your understanding of Azure Firewall’s rule hierarchy, where Network Rules handle IP/port filtering and Application Rules handle FQDN-based filtering for HTTP/HTTPS. A common trap is confusing Application Rules with Network Rules; remember that Network Rules cannot inspect the SNI header and therefore cannot filter by domain name. For a quick memory tip, think “App Rules for App Domains”—if the traffic uses HTTP or HTTPS and you need to allow or block by domain name, always choose an Application Rule.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 deploys Azure Firewall to inspect and control outbound traffic from a virtual network. The security team wants to allow outbound HTTPS traffic only to specific FQDNs such as *.microsoft.com and *.windowsupdate.com, while blocking all other outbound internet access. Which type of rule should they configure in Azure Firewall to achieve this filtering?
Why wrong: Network rules filter traffic based on IP addresses, ports, and protocols, not FQDNs. They cannot restrict outbound traffic to specific domain names.
B
Application Rule
Application rules are designed to filter outbound traffic based on FQDNs, making them the correct choice for allowing traffic only to specific domains like *.microsoft.com.
C
NAT Rule
Why wrong: NAT rules are used for inbound destination network address translation, not for outbound traffic filtering based on domain names.
D
DNAT Rule
Why wrong: DNAT rules are a type of NAT rule used for inbound traffic translation and do not apply to outbound filtering or FQDN-based rules.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Application Rule
Azure Firewall uses Application Rules to filter outbound traffic based on fully qualified domain names (FQDNs) for HTTP/HTTPS protocols. Since the requirement is to allow HTTPS traffic to specific FQDNs like *.microsoft.com and *.windowsupdate.com, an Application Rule is the correct choice because it can inspect the TLS Server Name Indication (SNI) extension to match the target FQDN, enabling granular allow/deny decisions for web traffic.
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.
✗
Network Rule
Why it's wrong here
Network rules filter traffic based on IP addresses, ports, and protocols, not FQDNs. They cannot restrict outbound traffic to specific domain names.
✓
Application Rule
Why this is correct
Application rules are designed to filter outbound traffic based on FQDNs, making them the correct choice for allowing traffic only to specific domains like *.microsoft.com.
Related concept
Read the scenario before looking for a memorised answer.
✗
NAT Rule
Why it's wrong here
NAT rules are used for inbound destination network address translation, not for outbound traffic filtering based on domain names.
✗
DNAT Rule
Why it's wrong here
DNAT rules are a type of NAT rule used for inbound traffic translation and do not apply to outbound filtering or FQDN-based rules.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Network Rules with Application Rules, mistakenly thinking that port 443 and IP addresses can achieve FQDN-based filtering, but Network Rules lack the ability to inspect the application layer (FQDN) and can only filter by IP/port, which is insufficient for domain-specific allowlisting.
Detailed technical explanation
How to think about this question
Azure Firewall Application Rules inspect the SNI extension in the TLS handshake for HTTPS traffic to extract the target FQDN, allowing or denying the connection before the full TLS tunnel is established. For non-encrypted HTTP traffic, the Host header is inspected. This rule type supports wildcard FQDNs (e.g., *.microsoft.com) and can be combined with threat intelligence-based filtering for enhanced security. A common real-world scenario is restricting corporate VMs to only access approved Microsoft update endpoints while blocking all other internet destinations.
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-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: Application Rule — Azure Firewall uses Application Rules to filter outbound traffic based on fully qualified domain names (FQDNs) for HTTP/HTTPS protocols. Since the requirement is to allow HTTPS traffic to specific FQDNs like *.microsoft.com and *.windowsupdate.com, an Application Rule is the correct choice because it can inspect the TLS Server Name Indication (SNI) extension to match the target FQDN, enabling granular allow/deny decisions for web traffic.
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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