This AZ-400 practice question tests your understanding of design and implement build and release pipelines. 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.
You need to create a build pipeline that runs on a Microsoft-hosted agent. You want to use the latest Ubuntu image. Which YAML snippet should you use?
pool: name: 'ubuntu-latest'
Why wrong: The 'name' property is for agent pools, not VM images.
agent: vmImage: 'ubuntu-latest'
Why wrong: 'agent' is not a valid top-level key; use 'pool'.
resources: vmImage: 'ubuntu-latest'
Why wrong: Resources are for external resources, not agent specification.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
pool: vmImage: 'ubuntu-latest'
Option A is correct because in Azure Pipelines YAML, the `pool` keyword is used to specify the agent pool, and `vmImage` is a sub-property that defines the virtual machine image for Microsoft-hosted agents. Setting `vmImage: 'ubuntu-latest'` within the `pool` section selects the latest Ubuntu LTS image provided by Microsoft, ensuring the build runs on a current, maintained environment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
pool: name: 'ubuntu-latest'
Why it's wrong here
The 'name' property is for agent pools, not VM images.
agent: vmImage: 'ubuntu-latest'
Why it's wrong here
'agent' is not a valid top-level key; use 'pool'.
resources: vmImage: 'ubuntu-latest'
Why it's wrong here
Resources are for external resources, not agent specification.
Option-by-option analysis
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-400 exam frequently reuses these exact scenarios with slightly different constraints.
Why this is wrong here
The 'name' property is for agent pools, not VM images.
Why this is wrong here
'agent' is not a valid top-level key; use 'pool'.
Why this is wrong here
Resources are for external resources, not agent specification.
Analysis generated from the official AZ-400blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
The trap here is that candidates confuse the `pool.name` property (used for self-hosted agents) with `pool.vmImage` (used for Microsoft-hosted agents), leading them to select option B, or they mistakenly use `agent` or `resources` as top-level keys for specifying the VM image.
Detailed technical explanation
The `vmImage` property maps to a specific Azure VM SKU in the Microsoft-hosted agent infrastructure; `ubuntu-latest` currently resolves to Ubuntu 22.04 LTS, but Microsoft may update this alias over time. The `pool` object also supports `demands` to filter agents with specific capabilities, and for Microsoft-hosted agents, `vmImage` is the only required sub-property. Understanding the distinction between `pool.name` (for self-hosted pools) and `pool.vmImage` (for Microsoft-hosted) is critical for correctly configuring agent selection.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Read the scenario before looking for a memorised answer..
The correct answer is: pool: vmImage: 'ubuntu-latest' — Option A is correct because in Azure Pipelines YAML, the `pool` keyword is used to specify the agent pool, and `vmImage` is a sub-property that defines the virtual machine image for Microsoft-hosted agents. Setting `vmImage: 'ubuntu-latest'` within the `pool` section selects the latest Ubuntu LTS image provided by Microsoft, ensuring the build runs on a current, maintained environment.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This AZ-400 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-400 exam.
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