AZ-400 Design and implement a DevOps infrastructure Practice Question
This AZ-400 practice question tests your understanding of design and implement a devops infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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
Resource Group: rg-devops
Location: eastus
Properties:
provisioningState: Succeeded
platformFaultDomainCount: 2
platformUpdateDomainCount: 5
virtualMachines:
- id: /subscriptions/.../vm1
- id: /subscriptions/.../vm2
statuses:
- code: AvailabilityState
level: Warning
displayStatus: Degraded
message: 'VM vm1 is not running on the fault tolerant infrastructure due to an ongoing platform event.'
Refer to the exhibit. You have an availability set with two VMs. One VM shows a degraded availability state. What is the most likely impact on application availability?
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.
Resource Group: rg-devops
Location: eastus
Properties:
provisioningState: Succeeded
platformFaultDomainCount: 2
platformUpdateDomainCount: 5
virtualMachines:
- id: /subscriptions/.../vm1
- id: /subscriptions/.../vm2
statuses:
- code: AvailabilityState
level: Warning
displayStatus: Degraded
message: 'VM vm1 is not running on the fault tolerant infrastructure due to an ongoing platform event.'
A
The application will be fully resilient to both planned and unplanned maintenance events.
Why wrong: Incorrect. One VM is degraded, so unplanned hardware failure could cause downtime.
B
The application will be vulnerable to unplanned hardware failures that affect the degraded VM's host.
Correct. The degraded VM is not on fault-tolerant infrastructure, meaning if its host fails, the VM will go down, potentially causing application downtime if the other VM cannot handle the load.
C
The application will experience downtime during planned maintenance events.
Why wrong: Incorrect. The platform still ensures at least one VM is available during planned maintenance because the update domain count is 5.
D
The application will continue to run without any impact because the other VM is healthy.
Why wrong: Incorrect. The degraded VM is at risk, and if it fails, the application may experience reduced capacity or downtime.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The application will be vulnerable to unplanned hardware failures that affect the degraded VM's host.
The availability set provides fault tolerance by distributing VMs across fault domains. A degraded state indicates one VM is on a host with potential issues, making it susceptible to unplanned hardware failures. The other VM remains healthy, but the application may not be fully resilient.
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 application will be fully resilient to both planned and unplanned maintenance events.
Why it's wrong here
Incorrect. One VM is degraded, so unplanned hardware failure could cause downtime.
✓
The application will be vulnerable to unplanned hardware failures that affect the degraded VM's host.
Why this is correct
Correct. The degraded VM is not on fault-tolerant infrastructure, meaning if its host fails, the VM will go down, potentially causing application downtime if the other VM cannot handle the load.
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 application will experience downtime during planned maintenance events.
Why it's wrong here
Incorrect. The platform still ensures at least one VM is available during planned maintenance because the update domain count is 5.
✗
The application will continue to run without any impact because the other VM is healthy.
Why it's wrong here
Incorrect. The degraded VM is at risk, and if it fails, the application may experience reduced capacity or downtime.
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-400 question in full detail.
Identify which AZ-400 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 and implement a DevOps infrastructure — This question tests Design and implement a DevOps infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The application will be vulnerable to unplanned hardware failures that affect the degraded VM's host. — The availability set provides fault tolerance by distributing VMs across fault domains. A degraded state indicates one VM is on a host with potential issues, making it susceptible to unplanned hardware failures. The other VM remains healthy, but the application may not be fully resilient.
What should I do if I get this AZ-400 question wrong?
Identify which AZ-400 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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