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
Refer to the exhibit.
```sql
-- Kusto Query Language (KQL) query
AzureActivity
| where OperationNameValue == 'MICROSOFT.COMPUTE/VIRTUALMACHINES/WRITE'
| where ActivityStatusValue == 'Succeeded'
| summarize count() by Caller, bin(TimeGenerated, 1h)
```
You run the above KQL query in Azure Monitor Logs. What does the query return?
Refer to the exhibit.
```sql
-- Kusto Query Language (KQL) query
AzureActivity
| where OperationNameValue == 'MICROSOFT.COMPUTE/VIRTUALMACHINES/WRITE'
| where ActivityStatusValue == 'Succeeded'
| summarize count() by Caller, bin(TimeGenerated, 1h)
```
A
The number of failed VM creation attempts per hour.
Why wrong: The query filters for 'Succeeded' activities, not failed.
B
The total number of successful operations across all Azure resources.
Why wrong: The query filters for VM write operations only.
C
The number of successful VM write operations per caller per hour.
The query summarizes successful VM write operations by caller and hour.
D
A list of all Azure activity log entries.
Why wrong: The query aggregates and summarizes, not lists all entries.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The number of successful VM write operations per caller per hour.
Option B is correct. The query filters AzureActivity for successful VM write operations, then summarizes the count by caller and hourly bins. Option A is wrong because it counts only successful, not failed. Option C is wrong because it groups by caller and hour. Option D is wrong because it does not include operation names.
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 number of failed VM creation attempts per hour.
Why it's wrong here
The query filters for 'Succeeded' activities, not failed.
✗
The total number of successful operations across all Azure resources.
The number of successful VM write operations per caller per hour.
Why this is correct
The query summarizes successful VM write operations by caller and hour.
Related concept
Read the scenario before looking for a memorised answer.
✗
A list of all Azure activity log entries.
Why it's wrong here
The query aggregates and summarizes, not lists all entries.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 number of successful VM write operations per caller per hour. — Option B is correct. The query filters AzureActivity for successful VM write operations, then summarizes the count by caller and hourly bins. Option A is wrong because it counts only successful, not failed. Option C is wrong because it groups by caller and hour. Option D is wrong because it does not include operation names.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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