The answer is that the query fails because the resource type string is case-sensitive in Azure Resource Graph. When you specify 'microsoft.compute/virtualmachines' in all lowercase, it does not match the actual resource type, which must be written as 'Microsoft.Compute/virtualMachines' with the correct capital letters. Azure Resource Graph queries are case-sensitive for resource types, even though the Azure portal and PowerShell may accept mixed case in other contexts. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this tests your understanding of how Azure Resource Manager (ARM) enforces casing for resource provider namespaces and types, a common trap where candidates assume case-insensitivity. A reliable memory tip is to always match the exact casing shown in the Azure portal when you browse a resource’s JSON view, as the resource type property there is the definitive source of truth.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. 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
{
"query": "Resources\n| where type == 'microsoft.compute/virtualmachines'\n| where properties.storageProfile.osDisk.managedDisk.storageAccountType == 'Premium_LRS'\n| project name, location, resourceGroup, properties.storageProfile.osDisk.diskSizeGB\n| order by diskSizeGB desc\n| limit 10"
}
Refer to the exhibit. You run the Azure Resource Graph query shown. A colleague asks why the query returns no results even though there are VMs in the subscription. The VMs use managed disks with Premium_LRS. What is the most likely reason for the empty result set?
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.
{
"query": "Resources\n| where type == 'microsoft.compute/virtualmachines'\n| where properties.storageProfile.osDisk.managedDisk.storageAccountType == 'Premium_LRS'\n| project name, location, resourceGroup, properties.storageProfile.osDisk.diskSizeGB\n| order by diskSizeGB desc\n| limit 10"
}
A
The storage account type is incorrectly specified; it should be 'Premium_ZRS'
Why wrong: Premium_LRS is correct for managed disks with premium SSD.
B
The resource type string is case-sensitive; it should be 'Microsoft.Compute/virtualMachines'
Azure Resource Graph queries are case-sensitive for resource type strings.
C
The 'limit 10' clause restricts too many results; remove the limit
Why wrong: The limit only restricts output to 10 rows; if there were any results, they would appear.
D
The 'name' property does not exist; use 'properties.name' instead
Why wrong: 'name' is a top-level property and is valid in Resource Graph queries.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The resource type string is case-sensitive; it should be 'Microsoft.Compute/virtualMachines'
Option B is correct because the query specifies 'microsoft.compute/virtualmachines' (all lowercase), but the correct casing includes capital letters: 'Microsoft.Compute/virtualMachines'. Option A is wrong because Premium_LRS is a valid storage account type. Option C is wrong because the query limits to 10 results, which is fine. Option D is wrong because the query does not filter by name.
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 storage account type is incorrectly specified; it should be 'Premium_ZRS'
Why it's wrong here
Premium_LRS is correct for managed disks with premium SSD.
✓
The resource type string is case-sensitive; it should be 'Microsoft.Compute/virtualMachines'
Why this is correct
Azure Resource Graph queries are case-sensitive for resource type strings.
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 'limit 10' clause restricts too many results; remove the limit
Why it's wrong here
The limit only restricts output to 10 rows; if there were any results, they would appear.
✗
The 'name' property does not exist; use 'properties.name' instead
Why it's wrong here
'name' is a top-level property and is valid in Resource Graph queries.
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.
Trap categories for this question
Command / output trap
The limit only restricts output to 10 rows; if there were any results, they would appear.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
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.
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 resource type string is case-sensitive; it should be 'Microsoft.Compute/virtualMachines' — Option B is correct because the query specifies 'microsoft.compute/virtualmachines' (all lowercase), but the correct casing includes capital letters: 'Microsoft.Compute/virtualMachines'. Option A is wrong because Premium_LRS is a valid storage account type. Option C is wrong because the query limits to 10 results, which is fine. Option D is wrong because the query does not filter by name.
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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