Question 742 of 208
How to Allow Only HTTP and HTTPS Traffic to Specific FQDNs Using Azure Firewall Application Rules
Your company uses Azure Firewall to filter outbound traffic from a virtual network. You need to allow only HTTP and HTTPS traffic to specific FQDNs, while blocking all other outbound traffic. Which Azure Firewall rule type should you use?
Quick Answer
The answer is application rules, because Azure Firewall application rules are specifically designed to allow outbound HTTP and HTTPS traffic to fully qualified domain names (FQDNs) while blocking all other outbound traffic. Unlike network rules, which filter by IP addresses and ports, application rules inspect the Host header in HTTP/HTTPS requests, enabling granular control over which FQDNs are permitted. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of Azure Firewall rule types and their appropriate use cases, often appearing in scenario-based questions where you must distinguish between network, NAT, threat intelligence, and application rules. A common trap is confusing network rules for FQDN filtering, but remember that network rules cannot filter by domain name—only by IP and port. For a quick memory tip: think “app rules for apps” since application rules handle application-layer protocols like HTTP and HTTPS, while network rules handle lower-layer traffic.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Application rule
Application rules in Azure Firewall allow filtering outbound traffic based on fully qualified domain names (FQDNs) for HTTP and HTTPS protocols. Option A is wrong because NAT rules only perform destination network address translation, not FQDN filtering. Option C is wrong because threat intelligence rules are used to block traffic from known malicious IP addresses, not for allowing FQDNs. Option D is wrong because network rules filter traffic based on IP addresses, ports, and protocols, not FQDNs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NAT rule
Why it's wrong here
Incorrect. NAT rules translate source or destination IP addresses and ports, they do not filter based on FQDNs.
- ✓
Application rule
Why this is correct
Correct. Application rules allow or deny outbound traffic based on FQDNs for HTTP/HTTPS, meeting the requirement.
- ✗
Threat intelligence rule
Why it's wrong here
Incorrect. Threat intelligence rules block traffic from known malicious IP addresses, they are not used for FQDN-based filtering.
- ✗
Network rule
Why it's wrong here
Incorrect. Network rules filter by IP addresses, ports, and protocols, but cannot filter by FQDN.
Visual reference
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Same concept, more angles
1 more way this is tested on SC-100
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Variation 1. A company uses Azure Firewall to protect their virtual network. They need to allow outbound HTTPS traffic to a specific external website while blocking all other outbound traffic. What should they configure?
easy- ✓ A.Add an Application Rule with the destination FQDN of the website.
- B.Add a Network Rule with the destination IP address and port 443.
- C.Add a Threat Intelligence rule to allow the website's domain.
- D.Add a DNAT Rule to translate the traffic to the website's IP.
Why A: Application Rules filter outbound traffic based on FQDN (e.g., *.contoso.com). Option B is wrong because Network Rules filter based on IP addresses/ports, not FQDNs. Option C is wrong because Threat Intelligence rules block known malicious IPs/FQDNs, not allow specific ones. Option D is wrong because DNAT rules are for inbound traffic.
Last reviewed: Jun 21, 2026
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