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Question 965 of 969
Design security solutions for applications and data →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to create a private endpoint and associate it with the App Service. This is correct because a private endpoint is a separate Azure resource that assigns a private IP address from your virtual network to the App Service, enabling inbound traffic from a backend subnet without traversing the public internet. Simply disabling public network access or adding a virtual network rule in the ACLs does not establish the private endpoint connection; the resource must be explicitly created and linked to the app. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of Azure Private Link versus service endpoints and VNet integration—a common trap is confusing outbound VNet integration (which provides outbound connectivity only) with inbound private endpoint access. Remember: for private inbound access, you must create the endpoint resource; ACLs alone are insufficient. Memory tip: “Private endpoint is a resource, not a setting”—if you see only ACLs or firewall rules, the missing component is the endpoint itself.

SC-100 Practice Question: Design security solutions for applications and data

This SC-100 practice question tests your understanding of design security solutions for applications and data. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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

{
  "name": "finance-app",
  "properties": {
    "networkAcls": {
      "defaultAction": "Deny",
      "ipRules": [],
      "virtualNetworkRules": [
        {
          "id": "/subscriptions/.../subnets/backend-subnet",
          "action": "Allow"
        }
      ]
    },
    "publicNetworkAccess": "Disabled"
  }
}

Refer to the exhibit. A security architect is reviewing the network configuration of an Azure App Service app named 'finance-app'. The app needs to be accessible from a backend subnet via private endpoint. Which additional configuration is required?

Question 1hardmultiple choice
Review the full subnetting walkthrough →

Exhibit

{
  "name": "finance-app",
  "properties": {
    "networkAcls": {
      "defaultAction": "Deny",
      "ipRules": [],
      "virtualNetworkRules": [
        {
          "id": "/subscriptions/.../subnets/backend-subnet",
          "action": "Allow"
        }
      ]
    },
    "publicNetworkAccess": "Disabled"
  }
}

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

✓

Create a private endpoint and associate it with the App Service

The exhibit shows network ACLs with a virtual network rule allowing traffic from a subnet. However, to use private endpoint, the app must be integrated with a private endpoint resource. The 'publicNetworkAccess' is disabled, but private endpoint access requires a private endpoint resource to be created and associated with the app. Option A is correct. Option B is wrong because IP-based SSL is unrelated to network access. Option C is wrong because a regional VNet integration provides outbound connectivity, not inbound private access. Option D is wrong because enabling public access would defeat the purpose of private endpoint.

Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

Answer analysis

Option-by-option breakdown

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

  • ✗

    Set publicNetworkAccess to Enabled

    Why it's wrong here

    Enabling public access would expose the app to the internet, contrary to the requirement

  • ✗

    Configure regional VNet integration for the app

    Why it's wrong here

    VNet integration provides outbound connectivity from the app to VNet, not inbound private access

  • ✓

    Create a private endpoint and associate it with the App Service

    Why this is correct

    Private endpoint is required for inbound private connectivity; the vNet rule alone does not enable private endpoint

    Related concept

    CIDR notation defines the prefix length.

  • ✗

    Enable IP-based SSL for the app

    Why it's wrong here

    IP-based SSL is for custom domains, not network access control

Common exam traps

Common exam trap: usable hosts are not the same as total addresses

Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.

Detailed technical explanation

How to think about this question

Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.

KKey Concepts to Remember

  • CIDR notation defines the prefix length.
  • Block size helps identify subnet boundaries.
  • Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
  • The required host count determines the smallest suitable subnet.

TExam Day Tips

  • Write the block size before choosing the subnet.
  • Check whether the question asks for hosts, subnets or a specific address range.
  • Do not confuse /24, /25, /26 and /27 host counts.

Key takeaway

Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.

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.

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-100 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this SC-100 question test?

Design security solutions for applications and data — This question tests Design security solutions for applications and data — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: Create a private endpoint and associate it with the App Service — The exhibit shows network ACLs with a virtual network rule allowing traffic from a subnet. However, to use private endpoint, the app must be integrated with a private endpoint resource. The 'publicNetworkAccess' is disabled, but private endpoint access requires a private endpoint resource to be created and associated with the app. Option A is correct. Option B is wrong because IP-based SSL is unrelated to network access. Option C is wrong because a regional VNet integration provides outbound connectivity, not inbound private access. Option D is wrong because enabling public access would defeat the purpose of private endpoint.

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

Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SC-100 subnetting questions on CIDR, address ranges, and subnet selection.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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Last reviewed: Jun 21, 2026

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