The answer is a custom image. This is the correct choice because a custom image captures the exact OS configuration, installed software, and settings from a source VM, allowing you to deploy a new VM from custom image that starts with identical customizations, including applications and system tweaks, rather than a generic marketplace image. On the AZ-104 exam, this concept tests your understanding of image-based deployment versus snapshot-based recovery; a common trap is confusing a snapshot (which is tied to a specific disk and VM state) with a custom image (which is a reusable, generalized template for new VMs). Remember that snapshots are for backup and restore, while custom images are for scaling out identical deployments. A simple memory tip: “Snapshots save a moment, images build a clone.”
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 are deploying a new Windows VM and want it to start with the same custom software and configuration that already exist on an approved production VM. What should you use as the source for the new VM?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A custom image
A custom image captures the exact OS configuration, installed software, and settings from a source VM, allowing you to deploy new VMs with identical customizations. Unlike a marketplace image, which provides only a generic OS, a custom image preserves all modifications made to the approved production VM, including applications and system tweaks.
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.
✗
A marketplace image
Why it's wrong here
A marketplace image provides a standard starting point, but it does not include your organization's custom software and settings.
✓
A custom image
Why this is correct
A custom image captures the OS and approved configuration so new VMs can be deployed with the same baseline.
Related concept
Read the scenario before looking for a memorised answer.
✗
A snapshot of the OS disk
Why it's wrong here
A snapshot is a point-in-time copy of a disk, but it is not the normal source for creating reusable VM deployments.
✗
An availability set
Why it's wrong here
An availability set improves resiliency, but it does not define the operating system or software image for a VM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a snapshot with a custom image, not realizing that a snapshot is a disk-level backup requiring additional steps to create a deployable VM, whereas a custom image is directly usable for VM creation with the exact software and configuration.
Detailed technical explanation
How to think about this question
A custom image is created by generalizing the source VM using Sysprep (for Windows) or waagent -deprovision (for Linux), which removes machine-specific identifiers like SID and hostname, making the image reusable for multiple deployments. The image is stored as a managed image resource in Azure, which can then be used to create new VMs with the same software stack, ensuring consistency across environments. In real-world scenarios, this is critical for maintaining compliance and reducing deployment time in dev/test or production rollouts.
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: A custom image — A custom image captures the exact OS configuration, installed software, and settings from a source VM, allowing you to deploy new VMs with identical customizations. Unlike a marketplace image, which provides only a generic OS, a custom image preserves all modifications made to the approved production VM, including applications and system tweaks.
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.
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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