AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
Which Azure compute option is BEST for a batch processing job that can tolerate interruptions and needs the lowest possible compute cost?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Spot VMs
Azure Spot VMs are designed for interruptible workloads like batch processing jobs that can tolerate preemption. They offer the lowest compute cost by leveraging unused Azure capacity, with discounts of up to 90% compared to pay-as-you-go pricing, making them the optimal choice for cost-sensitive, fault-tolerant tasks.
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.
✗
Azure Reserved VM Instances
Why it's wrong here
Reserved VMs provide discounts for committed capacity but aren't the cheapest option — Spot VMs offer higher discounts.
✓
Azure Spot VMs
Why this is correct
Spot VMs offer up to 90% discount by using spare Azure capacity — ideal for fault-tolerant batch jobs that can handle eviction.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Dedicated Host
Why it's wrong here
Dedicated Host provides isolated physical hardware at premium pricing — the most expensive option.
✗
Azure Functions Consumption Plan
Why it's wrong here
Functions are event-driven and serverless — not designed for long-running batch jobs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Spot VMs with Azure Reserved Instances, assuming reserved pricing is always the cheapest, but they fail to recognize that Spot VMs offer even lower costs for workloads that can handle interruptions, which is the key differentiator in this scenario.
Detailed technical explanation
How to think about this question
Under the hood, Azure Spot VMs use the same underlying hypervisor technology as standard VMs but are priced based on real-time supply and demand of spare capacity. When Azure needs the capacity back, it emits a 30-second eviction notice via the Azure Metadata Service, allowing the workload to checkpoint and resume later. This makes Spot VMs ideal for high-throughput, fault-tolerant batch jobs like rendering, big data analytics, or CI/CD pipelines where cost reduction is paramount.
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.
TExam Day Tips
→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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Spot VMs — Azure Spot VMs are designed for interruptible workloads like batch processing jobs that can tolerate preemption. They offer the lowest compute cost by leveraging unused Azure capacity, with discounts of up to 90% compared to pay-as-you-go pricing, making them the optimal choice for cost-sensitive, fault-tolerant tasks.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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