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A company uses Azure Firewall to filter outbound traffic. They want to ensure that all DNS queries from virtual machines in a spoke VNet are routed through the Azure Firewall for logging and inspection. They have already configured the firewall to use a custom DNS server. Which additional Azure Firewall feature must be enabled to ensure that the VMs use the firewall as a DNS proxy?

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A company uses Azure Firewall to filter outbound traffic. They want to ensure that all DNS queries from virtual machines in a spoke VNet are routed through the Azure Firewall for logging and inspection. They have already configured the firewall to use a custom DNS server. Which additional Azure Firewall feature must be enabled to ensure that the VMs use the firewall as a DNS proxy?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Best answer

Enable DNS proxy on the firewall policy

Correct. DNS proxy enables the firewall to act as a DNS proxy, accepting DNS queries from VMs and forwarding them to the configured DNS server.

B

Distractor review

Configure a DNS forwarding rule

Incorrect. Azure Firewall does not have a DNS forwarding rule; DNS proxy is the feature that handles DNS traffic forwarding.

C

Distractor review

Enable Threat Intelligence DNS logging

Incorrect. This feature logs DNS queries based on threat intelligence but does not route DNS traffic through the firewall.

D

Distractor review

Create a NAT rule for DNS traffic

Incorrect. NAT rules are used to translate destination IP addresses/ports, not to proxy DNS queries.

Common exam trap

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Technical deep dive

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

  • Static NAT maps one inside address to one outside address.
  • PAT allows many inside hosts to share one public address using ports.
  • Inside local and inside global describe the private and translated addresses.
  • NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

  • Identify inside and outside interfaces first.
  • Check whether the scenario needs static NAT, dynamic NAT or PAT.
  • Do not confuse NAT matching ACLs with normal packet-filtering intent.

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FAQ

Questions learners often ask

What does this AZ-500 question test?

Static NAT maps one inside address to one outside address.

What is the correct answer to this question?

The correct answer is: Enable DNS proxy on the firewall policy — The DNS proxy feature in Azure Firewall allows virtual machines to send DNS queries to the firewall's private IP address. The firewall then forwards these queries to the configured DNS server. This ensures all DNS traffic is inspected and logged. Enabling DNS proxy is the correct configuration to route DNS queries through the firewall.

What should I do if I get this AZ-500 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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