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Design security solutions for infrastructure →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that this Azure Policy denies virtual machines with managed disks if the OS disk type is not Standard_LRS or Premium_LRS. This works by evaluating the `Microsoft.Compute/virtualMachines` resource type and checking the `storageProfile.osDisk.managedDisk.storageAccountType` property; if the VM uses managed disks and the OS disk type is anything other than these two allowed values, the policy triggers a deny effect. On the Microsoft Cybersecurity Architect exam, this tests your ability to read policy definitions and understand how Azure Policy enforces compliance through resource properties—a common trap is confusing the deny effect with an audit or modify effect, or assuming it applies to data disks instead of the OS disk. Remember the mnemonic: "OS Disk, Two Tiers Only" to recall that only Standard_LRS and Premium_LRS are permitted for the operating system disk on managed VMs.

SC-100 Design security solutions for infrastructure Practice Question

This SC-100 practice question tests your understanding of design security solutions 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

{
  "properties": {
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Compute/virtualMachines"
          },
          {
            "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk",
            "exists": "true"
          }
        ]
      },
      "then": {
        "effect": "deny",
        "details": {
          "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk.storageAccountType",
          "notIn": ["Standard_LRS", "Premium_LRS"]
        }
      }
    },
    "parameters": {}
  }
}

Refer to the exhibit. You are reviewing an Azure Policy definition. What does this policy do?

Question 1mediummultiple choice
Full question →

Exhibit

{
  "properties": {
    "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.Compute/virtualMachines"
          },
          {
            "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk",
            "exists": "true"
          }
        ]
      },
      "then": {
        "effect": "deny",
        "details": {
          "field": "Microsoft.Compute/virtualMachines/storageProfile.osDisk.managedDisk.storageAccountType",
          "notIn": ["Standard_LRS", "Premium_LRS"]
        }
      }
    },
    "parameters": {}
  }
}

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

✓

Denies virtual machines with managed disks if the OS disk type is not Standard_LRS or Premium_LRS

Option D is correct. The policy rule denies virtual machines if the OS disk managed disk storage account type is not Standard_LRS or Premium_LRS. It checks if the VM uses managed disks, and if so, only allows Standard_LRS or Premium_LRS. Option A is wrong because it does not deny all VMs, only those with non-allowed disk types. Option B is wrong because it does not allow any disk type. Option C is wrong because it does not require encryption.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

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

  • ✗

    Requires all virtual machines to use encryption at host

    Why it's wrong here

    No encryption requirement in the policy.

  • ✗

    Allows only virtual machines with unmanaged disks

    Why it's wrong here

    The policy requires managed disks with specific types.

  • ✓

    Denies virtual machines with managed disks if the OS disk type is not Standard_LRS or Premium_LRS

    Why this is correct

    The policy denies non-compliant disk types.

    Related concept

    Standard ACLs match source addresses.

  • ✗

    Denies all virtual machines without managed disks

    Why it's wrong here

    The policy denies VMs with managed disks that are not Standard_LRS or Premium_LRS.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

  • Standard ACLs match source addresses.
  • Extended ACLs can match source, destination, protocol and ports.
  • The first matching ACL entry is used.
  • There is usually an implicit deny at the end.

TExam Day Tips

  • Check inbound versus outbound direction.
  • Read the ACL from top to bottom.
  • Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SC-100 ACL questions on filtering logic and placement.

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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 — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Denies virtual machines with managed disks if the OS disk type is not Standard_LRS or Premium_LRS — Option D is correct. The policy rule denies virtual machines if the OS disk managed disk storage account type is not Standard_LRS or Premium_LRS. It checks if the VM uses managed disks, and if so, only allows Standard_LRS or Premium_LRS. Option A is wrong because it does not deny all VMs, only those with non-allowed disk types. Option B is wrong because it does not allow any disk type. Option C is wrong because it does not require encryption.

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

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SC-100 ACL questions on filtering logic and placement.

What is the key concept behind this question?

Standard ACLs match source addresses.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

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Same concept, more angles

1 more ways this is tested on SC-100

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Refer to the exhibit. You are reviewing an Azure Policy definition. What will this policy do when assigned to a subscription?

medium
  • A.Deny creation of all virtual machines.
  • B.Audit existing virtual machines for compliance.
  • C.Enforce Premium SSD on data disks.
  • ✓ D.Prevent creation of virtual machines with OS disks that are not Premium SSD.

Why D: Option A is correct because the policy denies creation of VMs whose OS disk is not Premium_LRS. Option B is wrong because it only denies if the OS disk type is not Premium_LRS, not all VMs. Option C is wrong because it checks OS disk, not data disks. Option D is wrong because it evaluates at creation time.

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.