- A
Disable SNAT on the Azure Firewall for the application's public IP range.
Why wrong: Disabling SNAT would cause traffic to retain the original source IP, not use the firewall's public IP.
- B
Add a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall.
This ensures all internet-bound traffic from the application subnet is routed through Azure Firewall, using its public IP.
- C
Modify the Azure Firewall policy to enable forced tunneling.
Why wrong: Forced tunneling is a feature that sends firewall traffic to a next hop, not a policy setting to route spoke traffic.
- D
Configure Azure Firewall as a next hop for the virtual network gateway in the hub.
Why wrong: This would affect traffic from other spokes, not specifically force traffic from the application subnet through the firewall.
Quick Answer
The correct answer is to add a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall. This works because forced tunneling relies on effective routes; without a UDR explicitly pointing all internet-bound traffic to the firewall’s private IP, the spoke subnet may still use default Azure SNAT, bypassing the firewall’s public IP. On the AZ-500 exam, this scenario tests your understanding of how Azure Firewall integrates with custom routing in a hub-and-spoke topology—a common trap is assuming that deploying the firewall alone forces all traffic, when in fact you must pair it with a UDR on each spoke subnet. The key insight is that Azure Firewall’s public IP is only used for outbound traffic that actually passes through it; a UDR ensures the path is enforced. Memory tip: “UDR the 0/0 to the firewall’s private IP—public IP follows the route.”
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.
Your organization has deployed Azure Firewall in a hub-and-spoke network topology. You have configured forced tunneling so that all internet-bound traffic from the spoke virtual networks is routed through the Azure Firewall. Recently, a critical application in a spoke virtual network is experiencing intermittent connectivity failures to an external partner service. The partner service requires that traffic originate from a specific public IP address. You have configured Azure Firewall with a public IP address and have set up DNAT rules to allow inbound traffic. However, the outbound traffic from the application is still using the spoke's default outbound access via SNAT. You need to ensure that all outbound traffic from the application uses the Azure Firewall's public IP address. What should you do?
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
Add a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall.
Forced tunneling ensures that all internet-bound traffic is routed through the firewall. Option A is correct because a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall enforces that traffic goes through the firewall, thus using its public IP. Option B configures Azure Firewall as a next hop for the spoke gateway, which is not needed. Option C is not directly related to routing. Option D incorrectly suggests disabling SNAT, which would cause traffic to use the spoke's original IP, not the firewall's.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable SNAT on the Azure Firewall for the application's public IP range.
Why it's wrong here
Disabling SNAT would cause traffic to retain the original source IP, not use the firewall's public IP.
- ✓
Add a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall.
- ✗
Modify the Azure Firewall policy to enable forced tunneling.
Why it's wrong here
Forced tunneling is a feature that sends firewall traffic to a next hop, not a policy setting to route spoke traffic.
- ✗
Configure Azure Firewall as a next hop for the virtual network gateway in the hub.
Why it's wrong here
This would affect traffic from other spokes, not specifically force traffic from the application subnet through the firewall.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
- →
Secure networking — study guide chapter
Learn the concepts, then practise the questions
- →
Secure networking practice questions
Targeted practice on this topic area only
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Microsoft Azure Security Engineer Associate AZ-500 study guide
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AZ-500 practice test guide
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Add a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall. — Forced tunneling ensures that all internet-bound traffic is routed through the firewall. Option A is correct because a user-defined route (UDR) on the application's subnet with 0.0.0.0/0 next hop to Azure Firewall enforces that traffic goes through the firewall, thus using its public IP. Option B configures Azure Firewall as a next hop for the spoke gateway, which is not needed. Option C is not directly related to routing. Option D incorrectly suggests disabling SNAT, which would cause traffic to use the spoke's original IP, not the firewall's.
What should I do if I get this AZ-500 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Same concept, more angles
1 more ways this is tested on AZ-500
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An organization has deployed Azure Firewall and wants to inspect all outbound traffic from a virtual network (VNet) to the internet. The VNet already contains subnets with workloads. What is the required networking configuration to force traffic through Azure Firewall?
medium- ✓ A.Configure a route table with a default route (0.0.0.0/0) pointing to the Azure Firewall private IP and associate it with the subnets.
- B.Add a Network Security Group (NSG) rule that allows all outbound traffic and associate it with the subnets.
- C.Deploy an Application Gateway with Web Application Firewall (WAF) in front of the subnets.
- D.Enable Azure DDoS Protection Standard on the VNet.
Why A: Option A is correct because Azure Firewall requires a route table with a default route (0.0.0.0/0) that has the Azure Firewall's private IP as the next hop, associated with each subnet whose traffic must be inspected. This forces all outbound traffic from those subnets to be routed through the firewall, enabling inspection and logging. Without this explicit route, traffic would use the default system route and bypass the firewall.
Last reviewed: Jun 20, 2026
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