The answer is that the role lacks permissions to the diagnostics storage account. This is correct because boot diagnostics in Azure store serial console output and screenshots in a managed storage account, and accessing that data requires either the 'Microsoft.Storage/storageAccounts/listKeys/action' or 'Microsoft.Storage/storageAccounts/read' permission on the specific diagnostics storage account—without these, the Azure portal cannot retrieve the boot logs even if the user has full read access to the virtual machine itself. On the AZ-305 exam, this scenario tests your understanding of how Azure custom role permissions must chain across resources; a common trap is assuming that VM-level read rights are sufficient for boot diagnostics, when in fact the storage account is a separate resource requiring explicit authorization. Remember the memory tip: "Boot logs live in storage, not the VM"—so always check storage account permissions when troubleshooting boot diagnostics access.
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.
Refer to the exhibit. A custom role is created. A user assigned this role reports being unable to view the VM's boot diagnostics in the Azure portal. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The role lacks permissions to the diagnostics storage account
Option D is correct because the role does not include 'Microsoft.Storage/storageAccounts/listKeys/action' or 'Microsoft.Storage/storageAccounts/read' required to access boot diagnostics data in the diagnostics storage account. Option A is wrong because the role includes 'read' permission on VMs. Option B is wrong because start/restart are allowed. Option C is wrong because the issue is not related to VM size.
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 user does not have permission to start or restart the VM
Why it's wrong here
The role includes start and restart.
✗
The VM is stopped and deallocated
Why it's wrong here
Boot diagnostics can be viewed even when VM is stopped.
✓
The role lacks permissions to the diagnostics storage account
Why this is correct
Missing storage account permissions.
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 role does not include Microsoft.Compute/virtualMachines/read
Why it's wrong here
The role includes read.
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 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 role lacks permissions to the diagnostics storage account — Option D is correct because the role does not include 'Microsoft.Storage/storageAccounts/listKeys/action' or 'Microsoft.Storage/storageAccounts/read' required to access boot diagnostics data in the diagnostics storage account. Option A is wrong because the role includes 'read' permission on VMs. Option B is wrong because start/restart are allowed. Option C is wrong because the issue is not related to VM size.
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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