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Design infrastructure solutions →hardMultiple ChoiceObjective-mapped

AZ-305 Design infrastructure solutions Practice Question

This AZ-305 practice question tests your understanding of design infrastructure solutions. 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

Refer to the exhibit.

```
$rg = 'myResourceGroup'
$location = 'eastus'
$vnetName = 'myVNet'
$subnetName = 'mySubnet'
$publicIPName = 'myPublicIP'
$nsgName = 'myNSG'
$nicName = 'myNIC'
$vmName = 'myVM'
$vmSize = 'Standard_DS2_v2'
$adminUsername = 'azureuser'
$adminPassword = 'P@ssw0rd123!'

New-AzResourceGroup -Name $rg -Location $location
$subnet = New-AzVirtualNetworkSubnetConfig -Name $subnetName -AddressPrefix '10.0.1.0/24'
$vnet = New-AzVirtualNetwork -ResourceGroupName $rg -Location $location -Name $vnetName -AddressPrefix '10.0.0.0/16' -Subnet $subnet
$publicIP = New-AzPublicIpAddress -ResourceGroupName $rg -Location $location -AllocationMethod Static -Name $publicIPName
$nsgRule = New-AzNetworkSecurityRuleConfig -Name 'RDP' -Protocol Tcp -Direction Inbound -Priority 1000 -SourceAddressPrefix * -SourcePortRange * -DestinationAddressPrefix * -DestinationPortRange 3389 -Access Allow
$nsg = New-AzNetworkSecurityGroup -ResourceGroupName $rg -Location $location -Name $nsgName -SecurityRules $nsgRule
$nic = New-AzNetworkInterface -ResourceGroupName $rg -Location $location -Name $nicName -SubnetId $subnet.Id -PublicIpAddressId $publicIP.Id -NetworkSecurityGroupId $nsg.Id
$vmConfig = New-AzVMConfig -VMName $vmName -VMSize $vmSize
Set-AzVMOperatingSystem -VM $vmConfig -Windows -ComputerName $vmName -Credential (New-Object System.Management.Automation.PSCredential ($adminUsername, (ConvertTo-SecureString $adminPassword -AsPlainText -Force)))
New-AzVM -ResourceGroupName $rg -Location $location -VM $vmConfig
```

You execute the above PowerShell script to create a Windows VM in Azure. After the script completes, you try to RDP to the public IP address but the connection fails. 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 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.

```
$rg = 'myResourceGroup'
$location = 'eastus'
$vnetName = 'myVNet'
$subnetName = 'mySubnet'
$publicIPName = 'myPublicIP'
$nsgName = 'myNSG'
$nicName = 'myNIC'
$vmName = 'myVM'
$vmSize = 'Standard_DS2_v2'
$adminUsername = 'azureuser'
$adminPassword = 'P@ssw0rd123!'

New-AzResourceGroup -Name $rg -Location $location
$subnet = New-AzVirtualNetworkSubnetConfig -Name $subnetName -AddressPrefix '10.0.1.0/24'
$vnet = New-AzVirtualNetwork -ResourceGroupName $rg -Location $location -Name $vnetName -AddressPrefix '10.0.0.0/16' -Subnet $subnet
$publicIP = New-AzPublicIpAddress -ResourceGroupName $rg -Location $location -AllocationMethod Static -Name $publicIPName
$nsgRule = New-AzNetworkSecurityRuleConfig -Name 'RDP' -Protocol Tcp -Direction Inbound -Priority 1000 -SourceAddressPrefix * -SourcePortRange * -DestinationAddressPrefix * -DestinationPortRange 3389 -Access Allow
$nsg = New-AzNetworkSecurityGroup -ResourceGroupName $rg -Location $location -Name $nsgName -SecurityRules $nsgRule
$nic = New-AzNetworkInterface -ResourceGroupName $rg -Location $location -Name $nicName -SubnetId $subnet.Id -PublicIpAddressId $publicIP.Id -NetworkSecurityGroupId $nsg.Id
$vmConfig = New-AzVMConfig -VMName $vmName -VMSize $vmSize
Set-AzVMOperatingSystem -VM $vmConfig -Windows -ComputerName $vmName -Credential (New-Object System.Management.Automation.PSCredential ($adminUsername, (ConvertTo-SecureString $adminPassword -AsPlainText -Force)))
New-AzVM -ResourceGroupName $rg -Location $location -VM $vmConfig
```

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 network interface is not attached to the VM.

Option C is correct. The script creates an NSG with an inbound rule allowing RDP (port 3389) but the VM is created with the -Windows parameter, which should enable RDP. However, the script does not add any data disks or configure boot diagnostics. The most likely issue is that the script does not associate the NIC with the VM configuration properly. The New-AzVM cmdlet uses the -VM parameter, but the NIC is not added to the VM config. The script should include Add-AzVMNetworkInterface. Option A is wrong because the NSG rule allows RDP. Option B is wrong because the public IP is static. Option D is wrong because the VM size supports RDP.

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 network interface is not attached to the VM.

    Why this is correct

    The script does not add the NIC to the VM configuration before creation.

    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 public IP address is not assigned correctly.

    Why it's wrong here

    The script creates a static public IP and assigns it to the NIC.

  • ✗

    The NSG rule blocks RDP traffic.

    Why it's wrong here

    The NSG rule allows RDP on port 3389.

  • ✗

    The VM size does not support RDP.

    Why it's wrong here

    VM size does not affect RDP support; Windows VMs have RDP enabled by default.

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-305 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-305 question test?

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

What is the correct answer to this question?

The correct answer is: The network interface is not attached to the VM. — Option C is correct. The script creates an NSG with an inbound rule allowing RDP (port 3389) but the VM is created with the -Windows parameter, which should enable RDP. However, the script does not add any data disks or configure boot diagnostics. The most likely issue is that the script does not associate the NIC with the VM configuration properly. The New-AzVM cmdlet uses the -VM parameter, but the NIC is not added to the VM config. The script should include Add-AzVMNetworkInterface. Option A is wrong because the NSG rule allows RDP. Option B is wrong because the public IP is static. Option D is wrong because the VM size supports RDP.

What should I do if I get this AZ-305 question wrong?

Identify which AZ-305 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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