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Secure networking →mediumMultiple ChoiceObjective-mapped

AZ-500 Secure networking Practice Question

This AZ-500 practice question tests your understanding of secure networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Exhibit

{
  "properties": {
    "policy": {
      "rules": [
        {
          "name": "AllowInternal",
          "ruleType": "ApplicationRule",
          "protocols": [
            {
              "protocolType": "Https",
              "port": 443
            }
          ],
          "targetFqdns": [
            "*.contoso.com"
          ],
          "sourceAddresses": [
            "10.0.0.0/16"
          ],
          "destinationAddresses": [
            "172.16.0.0/12"
          ]
        }
      ]
    }
  }
}

Refer to the exhibit. You are reviewing an Azure Firewall policy rule. The rule is intended to allow traffic from the 10.0.0.0/16 network to *.contoso.com on HTTPS. However, the rule is not working as expected. What is the most likely issue?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1mediummultiple choice
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Exhibit

{
  "properties": {
    "policy": {
      "rules": [
        {
          "name": "AllowInternal",
          "ruleType": "ApplicationRule",
          "protocols": [
            {
              "protocolType": "Https",
              "port": 443
            }
          ],
          "targetFqdns": [
            "*.contoso.com"
          ],
          "sourceAddresses": [
            "10.0.0.0/16"
          ],
          "destinationAddresses": [
            "172.16.0.0/12"
          ]
        }
      ]
    }
  }
}

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 rules cannot have both targetFqdns and destinationAddresses; destinationAddresses should be removed.

In Azure Firewall application rules, the destinationAddresses field is typically used for network rules; for application rules, the destination is specified by FQDN. However, specifying both targetFqdns and destinationAddresses in an application rule is invalid because application rules use FQDNs, not IP addresses. The presence of destinationAddresses may cause the rule to be misconfigured or ignored.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    The source address range is too broad and should be more specific.

    Why it's wrong here

    Broad source range is not necessarily an issue; it can be used as intended.

  • ✗

    The protocol should be Http, not Https.

    Why it's wrong here

    The rule specifies HTTPS on port 443, which is correct for HTTPS traffic.

  • ✓

    Application rules cannot have both targetFqdns and destinationAddresses; destinationAddresses should be removed.

    Why this is correct

    Application rules use targetFqdns for destination; destinationAddresses is invalid and may cause the rule to fail.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Static NAT maps one inside address to one outside address.

  • ✗

    The rule should be a network rule, not an application rule.

    Why it's wrong here

    Network rules filter by IP and port, not FQDN. The rule intends to allow by FQDN, so application rule is appropriate.

Common exam traps

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.

Detailed technical explanation

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.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-500 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this AZ-500 question test?

Secure networking — This question tests Secure networking — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Application rules cannot have both targetFqdns and destinationAddresses; destinationAddresses should be removed. — In Azure Firewall application rules, the destinationAddresses field is typically used for network rules; for application rules, the destination is specified by FQDN. However, specifying both targetFqdns and destinationAddresses in an application rule is invalid because application rules use FQDNs, not IP addresses. The presence of destinationAddresses may cause the rule to be misconfigured or ignored.

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

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-500 NAT questions on configuration and troubleshooting.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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Last reviewed: Jun 20, 2026

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This AZ-500 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-500 exam.