The answer is `az deployment group what-if`. This command is the correct choice because it performs a dry-run of a Bicep deployment against a specified resource group, returning a detailed preview of all resources that will be created, modified, or deleted without actually applying any changes. This allows you to validate the deployment’s impact and catch unintended modifications before committing, making it an essential tool for safe infrastructure-as-code workflows. On the AZ-104 exam, this concept tests your understanding of deployment validation versus execution—a common trap is confusing `what-if` with `validate` (which only checks syntax) or with `create` (which applies changes immediately). Remember that `what-if` is the only command that gives you a change list without altering your environment. A helpful memory tip: think of the command as asking “what if I run this deployment?”—it answers with a preview, not a promise.
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. 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.
You want to preview what a Bicep deployment will change before you apply it to a resource group. Which command should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
az deployment group what-if
The `az deployment group what-if` command allows you to preview the changes a Bicep deployment will make to a resource group before actually applying them. It returns a list of resources that will be created, modified, or deleted, enabling you to validate the deployment's impact without committing any changes. This is the correct tool for a dry-run or validation scenario.
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.
✓
az deployment group what-if
Why this is correct
The what-if command shows the planned create, modify, and delete operations before you run the deployment.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
az vm create
Why it's wrong here
This command creates a VM directly, but it does not preview a full template deployment.
✗
az monitor metrics list
Why it's wrong here
This command queries metrics, which is unrelated to deployment preview behavior.
✗
az deployment group create --mode Complete
Why it's wrong here
This command performs a deployment, and complete mode can delete resources, but it is not a preview.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse `az deployment group what-if` with `az deployment group validate` (which checks template syntax but does not show resource-level changes), or they might think `az deployment group create --mode Complete` provides a preview, when in fact it executes the deployment immediately.
Trap categories for this question
Command / output trap
This command creates a VM directly, but it does not preview a full template deployment.
Detailed technical explanation
How to think about this question
The `what-if` operation uses the Azure Resource Manager's internal deployment validation engine to simulate the deployment against the current state of the resource group. It evaluates the Bicep template's resource definitions and compares them to existing resources, generating a detailed list of changes (e.g., Create, Delete, Modify) with property-level diffs. This is particularly useful in CI/CD pipelines to catch unintended deletions or modifications before they occur, especially when using Complete mode deployments.
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
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-104 question in full detail.
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: az deployment group what-if — The `az deployment group what-if` command allows you to preview the changes a Bicep deployment will make to a resource group before actually applying them. It returns a list of resources that will be created, modified, or deleted, enabling you to validate the deployment's impact without committing any changes. This is the correct tool for a dry-run or validation scenario.
What should I do if I get this AZ-104 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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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