Quick Answer
The answer is a DNS and routing design that prevents direct internet bypass. This is correct because in a hub-and-spoke topology, a User Defined Route (UDR) with the 0.0.0.0/0 prefix and next hop type VirtualAppliance pointing to the Azure Firewall’s private IP forces all outbound spoke traffic through the firewall for egress inspection, while DNS configuration—such as using Azure Private DNS zones or a custom DNS server that resolves only internal names—ensures no workload can resolve external addresses and bypass the firewall via a direct internet route. On the AZ-500 exam, this tests your understanding of network segmentation and forced tunneling; a common trap is assuming a UDR alone suffices without also controlling DNS resolution, which would allow a spoke VM to use a public DNS server and exit directly. Remember the mnemonic “Route and Resolve” to recall that both the UDR and DNS settings are required to lock down egress.
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 hub-and-spoke Azure network uses Azure Firewall for egress inspection. Which two settings are typically required on spoke workloads?
Public IP addresses on every VM
Why wrong: This does not meet the stated requirement as directly as the correct option.
UDRs that send default traffic to the firewall next hop
Correct for the stated requirement.
NSG rules that allow all inbound internet traffic
Why wrong: This does not meet the stated requirement as directly as the correct option.
DNS/routing design that prevents direct internet bypass
Correct for the stated requirement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
UDRs that send default traffic to the firewall next hop
In a hub-and-spoke topology with Azure Firewall for egress inspection, spoke workloads must not be able to bypass the firewall. A User Defined Route (UDR) with address prefix 0.0.0.0/0 and next hop type VirtualAppliance pointing to the firewall's private IP forces all outbound traffic through the firewall. Additionally, DNS and routing design must prevent direct internet access—for example, by using Azure Private DNS zones or custom DNS servers that resolve only internal names, ensuring that no traffic can exit the spoke without firewall inspection.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Public IP addresses on every VM
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
UDRs that send default traffic to the firewall next hop
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
NSG rules that allow all inbound internet traffic
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
DNS/routing design that prevents direct internet bypass
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often think only a UDR is needed, forgetting that DNS and routing design must also prevent direct internet bypass—for example, if spoke VMs use Azure's default DNS (168.63.129.16), they can still resolve public names and potentially bypass the firewall via outbound UDP 53 traffic if not explicitly routed through the firewall.
Detailed technical explanation
The UDR with 0.0.0.0/0 next hop to the firewall ensures that all outbound traffic, including responses to inbound connections, is routed through the firewall for inspection. However, Azure automatically creates a default system route for 0.0.0.0/0 with next hop Internet; overriding it with a UDR is essential. A common subtlety is that if the firewall's private IP is in a different virtual network, you must enable 'Use remote virtual network gateways' or configure VNet peering with 'Allow forwarded traffic' to ensure the UDR works correctly.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
The correct answer is: UDRs that send default traffic to the firewall next hop — In a hub-and-spoke topology with Azure Firewall for egress inspection, spoke workloads must not be able to bypass the firewall. A User Defined Route (UDR) with address prefix 0.0.0.0/0 and next hop type VirtualAppliance pointing to the firewall's private IP forces all outbound traffic through the firewall. Additionally, DNS and routing design must prevent direct internet access—for example, by using Azure Private DNS zones or custom DNS servers that resolve only internal names, ensuring that no traffic can exit the spoke without firewall inspection.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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