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Design security solutions for infrastructure →mediumMultiple ChoiceObjective-mapped

SC-100 Design security solutions for infrastructure Practice Question

This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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": {
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Compute/virtualMachines"
          },
          {
            "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk",
            "exists": "false"
          }
        ]
      },
      "then": {
        "effect": "deny"
      }
    }
  }
}

Refer to the exhibit. You are reviewing an Azure Policy definition that is assigned to a subscription containing several virtual machines. After the assignment, users report that they cannot create new VMs. What is the most likely reason?

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
Full question →

Exhibit

{
  "properties": {
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Compute/virtualMachines"
          },
          {
            "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk",
            "exists": "false"
          }
        ]
      },
      "then": {
        "effect": "deny"
      }
    }
  }
}

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 policy denies creation of VMs that do not use managed disks.

Option A is correct because the policy denies creation of VMs that do not use managed disks. The condition checks if the osDisk.managedDisk field does not exist, and if so, denies the request. Therefore, any attempt to create a VM with unmanaged disks will be denied. Option B is wrong because the policy only denies creation, it does not affect existing VMs. Option C is wrong because the policy denies all VMs without managed disks, not just those with a specific size. Option D is wrong because the policy does not require premium SSDs; it only requires managed disks.

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 policy denies creation of VMs with a specific size.

    Why it's wrong here

    No size condition is in the policy.

  • ✓

    The policy denies creation of VMs that do not use managed disks.

    Why this is correct

    The policy rule denies if managed disk does not exist for OS disk.

    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.

  • ✗

    The policy denies creation of VMs that use managed disks.

    Why it's wrong here

    The condition checks for absence of managed disks, so it denies unmanaged disks.

  • ✗

    The policy denies creation of VMs that do not use premium SSDs.

    Why it's wrong here

    The policy only checks for managed disks, not premium SSDs.

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

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

What to study next

Got this wrong? Here's your next step.

Identify which SC-100 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 SC-100 question test?

Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The policy denies creation of VMs that do not use managed disks. — Option A is correct because the policy denies creation of VMs that do not use managed disks. The condition checks if the osDisk.managedDisk field does not exist, and if so, denies the request. Therefore, any attempt to create a VM with unmanaged disks will be denied. Option B is wrong because the policy only denies creation, it does not affect existing VMs. Option C is wrong because the policy denies all VMs without managed disks, not just those with a specific size. Option D is wrong because the policy does not require premium SSDs; it only requires managed disks.

What should I do if I get this SC-100 question wrong?

Identify which SC-100 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 21, 2026

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This SC-100 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 SC-100 exam.