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Question 319 of 1,000
Secure networking →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that the custom rule blocks all private IP addresses. This is because the Azure WAF custom rule blocking private IP addresses is explicitly configured with a match condition targeting the 10.0.0.0/8 range, which falls under RFC 1918 private address space, and the action is set to Block. The user’s IP of 10.1.2.3 falls squarely within that range, so the request is denied before any other rule evaluation occurs. On the AZ-500 exam, this scenario tests your understanding of how custom WAF rules are evaluated in order and how they override default rule sets—a common trap is assuming a rule is disabled or that the action is a redirect. Remember, private IP ranges are non-routable on the internet, so any traffic from them hitting a public-facing Application Gateway is suspicious and often blocked by design. Memory tip: think “10.0.0.0/8 = private, private = blocked by custom rule.”

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": {
    "format": "Json",
    "rules": [
      {
        "name": "BlockHighRiskIPs",
        "priority": 100,
        "ruleType": "MatchRule",
        "matchConditions": [
          {
            "matchVariables": [
              {
                "variableName": "RemoteAddr"
              }
            ],
            "operator": "IPMatch",
            "negationCondition": false,
            "matchValues": [
              "10.0.0.0/8",
              "172.16.0.0/12",
              "192.168.0.0/16"
            ]
          }
        ],
        "action": "Block"
      }
    ]
  }
}

Refer to the exhibit. You have an Azure Application Gateway WAF policy with the above JSON configuration. A user from IP address 10.1.2.3 reports they cannot access the web application. What is the most likely cause?

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 1hardmultiple choice
Full question →

Exhibit

{
  "properties": {
    "format": "Json",
    "rules": [
      {
        "name": "BlockHighRiskIPs",
        "priority": 100,
        "ruleType": "MatchRule",
        "matchConditions": [
          {
            "matchVariables": [
              {
                "variableName": "RemoteAddr"
              }
            ],
            "operator": "IPMatch",
            "negationCondition": false,
            "matchValues": [
              "10.0.0.0/8",
              "172.16.0.0/12",
              "192.168.0.0/16"
            ]
          }
        ],
        "action": "Block"
      }
    ]
  }
}

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

✓

The custom rule blocks all private IP addresses.

Option D is correct because the WAF policy blocks traffic from private IP ranges (RFC 1918). The user's IP is in the 10.0.0.0/8 range, so it is blocked. Option A is wrong because the rule is custom. Option B is wrong because the action is Block, not redirect. Option C is wrong because the rule is not disabled.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 WAF policy is in prevention mode and detected a SQL injection.

    Why it's wrong here

    No SQL injection pattern.

  • ✗

    The WAF policy is set to detection mode and logs the request.

    Why it's wrong here

    Block action is specified.

  • ✗

    The custom rule is disabled due to a syntax error.

    Why it's wrong here

    JSON is valid.

  • ✓

    The custom rule blocks all private IP addresses.

    Why this is correct

    Rule blocks RFC 1918 addresses including 10.0.0.0/8.

    Clue confirmation

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

    Related concept

    Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Identify which AZ-500 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this AZ-500 question test?

Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The custom rule blocks all private IP addresses. — Option D is correct because the WAF policy blocks traffic from private IP ranges (RFC 1918). The user's IP is in the 10.0.0.0/8 range, so it is blocked. Option A is wrong because the rule is custom. Option B is wrong because the action is Block, not redirect. Option C is wrong because the rule is not disabled.

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

Identify which AZ-500 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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?

Read the scenario before looking for a memorised answer.

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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.