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Design security for infrastructure →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is virtual machines with Standard_LRS managed disks will be audited. This is because the auditIfNotExists effect in Azure Policy checks whether a specific supporting resource exists for a given resource type; here, it audits any virtual machine that does not have a Standard_LRS managed disk associated, meaning the policy flags VMs that are using unmanaged disks or other disk SKUs as non-compliant. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of how auditIfNotExists evaluates conditions against associated resources, often appearing in scenarios about enforcing disk type standards for security or cost control. A common trap is confusing auditIfNotExists with Deny—remember that auditIfNotExists only logs non-compliance without blocking deployment, and it triggers when the specified condition (like having a Standard_LRS disk) is missing. Memory tip: think of auditIfNotExists as “audit when the good thing is absent”—if the required disk type isn’t there, the VM gets flagged.

SC-100 Design security for infrastructure Practice Question

This SC-100 practice question tests your understanding of design security for infrastructure. 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.

Exhibit

Refer to the exhibit.

```json
{
  "properties": {
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Compute/virtualMachines"
          },
          {
            "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk",
            "exists": "true"
          },
          {
            "anyOf": [
              {
                "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk.storageAccountType",
                "notEquals": "Premium_LRS"
              },
              {
                "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.diskSizeGB",
                "greater": 1023
              }
            ]
          }
        ]
      },
      "then": {
        "effect": "audit"
      }
    }
  }
}
```

Refer to the exhibit. An Azure policy is defined as shown. Which resources will be audited?

Question 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.

```json
{
  "properties": {
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Compute/virtualMachines"
          },
          {
            "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk",
            "exists": "true"
          },
          {
            "anyOf": [
              {
                "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk.storageAccountType",
                "notEquals": "Premium_LRS"
              },
              {
                "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.diskSizeGB",
                "greater": 1023
              }
            ]
          }
        ]
      },
      "then": {
        "effect": "audit"
      }
    }
  }
}
```

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

✓

Virtual machines with Standard_LRS managed disks

The Azure policy definition in the exhibit uses the 'auditIfNotExists' effect with a condition that checks if the 'Microsoft.Compute/virtualMachines' resource type has a 'Microsoft.Compute/disks' resource of type 'Standard_LRS' associated. This means the policy audits virtual machines that do NOT have a managed disk of type Standard_LRS, effectively auditing VMs with unmanaged disks or other managed disk SKUs. Option C is correct because the policy specifically targets virtual machines with Standard_LRS managed disks for audit, as the condition evaluates to true when the disk type is Standard_LRS, triggering the audit effect.

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.

  • ✗

    All Azure resources that are not compliant

    Why it's wrong here

    The policy scope is limited to VMs.

  • ✗

    All virtual machines with unmanaged disks

    Why it's wrong here

    The policy only checks managed disks (exists condition).

  • ✓

    Virtual machines with Standard_LRS managed disks

    Why this is correct

    Standard_LRS is not Premium_LRS, so it matches the notEquals condition.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Virtual machines with Premium_LRS managed disks and disk size 1024 GB

    Why it's wrong here

    Premium_LRS is excluded from the notEquals condition.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Microsoft often tests the nuance of 'auditIfNotExists' vs. 'audit' effects, where candidates mistakenly think the policy audits all non-compliant resources or unmanaged disks, but the policy actually audits only when the specified condition (Standard_LRS disk exists) is true, not when it is false.

Detailed technical explanation

How to think about this question

The 'auditIfNotExists' effect in Azure Policy evaluates whether a specified related resource exists; if it does not exist, the parent resource is marked non-compliant. In this case, the policy uses a 'Microsoft.Compute/virtualMachines' scope with a 'Microsoft.Compute/disks' alias, checking for a disk with a 'sku.name' of 'Standard_LRS'. Under the hood, Azure Policy evaluates the existence of the child resource (disk) with the specified property; if the VM has a Standard_LRS managed disk, the condition is met and the audit is triggered. This is a common pattern for enforcing specific disk SKUs, but it does not audit VMs with unmanaged disks because those disks are not represented as 'Microsoft.Compute/disks' resources.

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.

TExam Day Tips

  • 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this SC-100 question test?

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

What is the correct answer to this question?

The correct answer is: Virtual machines with Standard_LRS managed disks — The Azure policy definition in the exhibit uses the 'auditIfNotExists' effect with a condition that checks if the 'Microsoft.Compute/virtualMachines' resource type has a 'Microsoft.Compute/disks' resource of type 'Standard_LRS' associated. This means the policy audits virtual machines that do NOT have a managed disk of type Standard_LRS, effectively auditing VMs with unmanaged disks or other managed disk SKUs. Option C is correct because the policy specifically targets virtual machines with Standard_LRS managed disks for audit, as the condition evaluates to true when the disk type is Standard_LRS, triggering the audit effect.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 30, 2026

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