- A
That the Recovery Services vault is in the same resource group as the VM.
Why wrong: Vault placement in the resource group is not the first thing to check for a guest-agent readiness error.
- B
That the Azure VM Agent service is installed and running inside the guest OS.
Azure VM Backup depends on the VM guest agent to coordinate extensions and backup integration. If the agent is missing, stopped, or unhealthy, backup jobs can fail immediately with a readiness message. Verifying the agent state is the correct first troubleshooting step before looking at policy, retention, or vault configuration.
- C
That soft delete is enabled on the vault.
Why wrong: Soft delete helps protect deleted backup data, but it does not resolve an unhealthy guest agent.
- D
That the subscription has enough free Azure Backup storage capacity.
Why wrong: Storage capacity concerns do not cause an immediate VM agent readiness failure on a new backup job.
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An Azure VM backup job starts failing immediately after protection is enabled. The error states that the VM agent is not ready. The VM was created from a custom image and no extensions have ever installed successfully. What should the administrator verify first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
That the Azure VM Agent service is installed and running inside the guest OS.
The error 'VM agent not ready' indicates that the Azure Backup extension cannot communicate with the VM agent inside the guest OS. Since the VM was created from a custom image and no extensions have ever installed successfully, the most likely cause is that the Azure VM Agent service is not installed or not running. The agent is required for backup extensions to function, so verifying its status inside the guest OS is the first troubleshooting step.
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.
- ✗
That the Recovery Services vault is in the same resource group as the VM.
Why it's wrong here
Vault placement in the resource group is not the first thing to check for a guest-agent readiness error.
When this WOULD be correct
If the error message indicated that the backup job failed because the vault could not communicate with the VM due to network restrictions, and the question asked what to verify first, then checking that the vault is in the same resource group might be relevant if a resource group-level network security group is blocking traffic.
- ✓
That the Azure VM Agent service is installed and running inside the guest OS.
Why this is correct
Azure VM Backup depends on the VM guest agent to coordinate extensions and backup integration. If the agent is missing, stopped, or unhealthy, backup jobs can fail immediately with a readiness message. Verifying the agent state is the correct first troubleshooting step before looking at policy, retention, or vault configuration.
Clue confirmation
The clue words "first", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
That soft delete is enabled on the vault.
Why it's wrong here
Soft delete helps protect deleted backup data, but it does not resolve an unhealthy guest agent.
When this WOULD be correct
If the question described a scenario where backup data was being deleted accidentally or a user wanted to recover deleted backup items, verifying that soft delete is enabled would be the correct first step to ensure recoverability.
- ✗
That the subscription has enough free Azure Backup storage capacity.
Why it's wrong here
Storage capacity concerns do not cause an immediate VM agent readiness failure on a new backup job.
When this WOULD be correct
If the error message indicated insufficient storage quota or backup job failures due to capacity limits, then verifying free Azure Backup storage capacity would be the correct first step.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓That the Azure VM Agent service is installed and running inside the guest OS.Correct answer▾
Why this is correct
Azure VM Backup depends on the VM guest agent to coordinate extensions and backup integration. If the agent is missing, stopped, or unhealthy, backup jobs can fail immediately with a readiness message. Verifying the agent state is the correct first troubleshooting step before looking at policy, retention, or vault configuration.
✗That the Recovery Services vault is in the same resource group as the VM.Wrong answer — click to see why▾
Why this is wrong here
The error specifically states the VM agent is not ready, which is a guest OS issue, not a resource group placement issue. The Recovery Services vault can be in a different resource group than the VM and still function correctly.
★ When this WOULD be the correct answer
If the error message indicated that the backup job failed because the vault could not communicate with the VM due to network restrictions, and the question asked what to verify first, then checking that the vault is in the same resource group might be relevant if a resource group-level network security group is blocking traffic.
Why candidates choose this
Candidates may mistakenly think that Azure resources must be in the same resource group to interact, confusing resource group scope with functional connectivity requirements.
✗That soft delete is enabled on the vault.Wrong answer — click to see why▾
Why this is wrong here
Soft delete is a data protection feature that prevents accidental deletion of backup data, but it does not affect the VM agent readiness or backup job initiation. The error specifically indicates the VM agent is not responding, which is unrelated to soft delete settings.
★ When this WOULD be the correct answer
If the question described a scenario where backup data was being deleted accidentally or a user wanted to recover deleted backup items, verifying that soft delete is enabled would be the correct first step to ensure recoverability.
Why candidates choose this
Candidates may confuse soft delete with a prerequisite for backup success, thinking that enabling it is necessary for backup jobs to run, when in fact it only protects backup data after creation.
✗That the subscription has enough free Azure Backup storage capacity.Wrong answer — click to see why▾
Why this is wrong here
The error specifically states the VM agent is not ready, which is a guest OS issue, not a storage capacity issue. Backup storage capacity does not affect the VM agent's readiness.
★ When this WOULD be the correct answer
If the error message indicated insufficient storage quota or backup job failures due to capacity limits, then verifying free Azure Backup storage capacity would be the correct first step.
Why candidates choose this
Candidates may confuse general backup failures with capacity issues, assuming that lack of storage space could prevent backup jobs from starting.
Analysis generated from the official AZ-104blueprint 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
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the issue is a vault configuration or capacity problem, but the 'VM agent not ready' error specifically points to a missing or non-functional guest agent, which is a common oversight when using custom images.
Detailed technical explanation
How to think about this question
The Azure VM Agent (waagent on Linux, WindowsAzureGuestAgent on Windows) is a guest OS service that enables Azure extensions, including the Backup extension (IaaSBcdrExtension). When a custom image is used, the agent must be manually installed and configured; otherwise, the Azure fabric cannot communicate with the VM to orchestrate backup snapshots. The agent communicates over TCP port 80 (HTTP) and 443 (HTTPS) with the Azure host, and its status can be checked via `Get-AzureRmVM -Status` or inside the OS using `services.msc` (Windows) or `systemctl status waagent` (Linux).
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Deploy and Manage Azure Compute — study guide chapter
Learn the concepts, then practise the questions
- →
Deploy and Manage Azure Compute practice questions
Targeted practice on this topic area only
- →
All AZ-104 questions
1,170 questions across all exam domains
- →
AZ-104 study guide
Full concept coverage aligned to exam objectives
- →
AZ-104 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related AZ-104 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Manage Azure Identities and Governance practice questions
Practise AZ-104 questions linked to Manage Azure Identities and Governance.
Implement and Manage Storage practice questions
Practise AZ-104 questions linked to Implement and Manage Storage.
Deploy and Manage Azure Compute practice questions
Practise AZ-104 questions linked to Deploy and Manage Azure Compute.
Implement and Manage Virtual Networking practice questions
Practise AZ-104 questions linked to Implement and Manage Virtual Networking.
Monitor and Maintain Azure Resources practice questions
Practise AZ-104 questions linked to Monitor and Maintain Azure Resources.
AZ-104 Azure RBAC practice questions
Practise AZ-104 questions linked to AZ-104 Azure RBAC.
AZ-104 storage account practice questions
Practise AZ-104 questions linked to AZ-104 storage account.
AZ-104 virtual network practice questions
Practise AZ-104 questions linked to AZ-104 virtual network.
AZ-104 NSG practice questions
Practise AZ-104 questions linked to AZ-104 NSG.
AZ-104 Azure Monitor practice questions
Practise AZ-104 questions linked to AZ-104 Azure Monitor.
AZ-104 backup practice questions
Practise AZ-104 questions linked to AZ-104 backup.
AZ-104 managed identity practice questions
Practise AZ-104 questions linked to AZ-104 managed identity.
Practice this exam
Start a free AZ-104 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this AZ-104 question test?
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: That the Azure VM Agent service is installed and running inside the guest OS. — The error 'VM agent not ready' indicates that the Azure Backup extension cannot communicate with the VM agent inside the guest OS. Since the VM was created from a custom image and no extensions have ever installed successfully, the most likely cause is that the Azure VM Agent service is not installed or not running. The agent is required for backup extensions to function, so verifying its status inside the guest OS is the first troubleshooting step.
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: "first", "immediately / without restart". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More AZ-104 practice questions
- A storage automation service principal must upload, read, and delete blob data in one container by using Microsoft Entra…
- A subnet contains several application servers. You need to allow inbound TCP 3389 only from a management subnet named Su…
- A subscription admin wants to investigate who changed a resource and also review the platform-generated events for that…
- Based on the exhibit, which Azure feature should the administrator use to track this kind of platform-wide service issue…
- An administrator wants a script running on an Azure VM to create a resource in Azure without storing any passwords or cl…
- A PowerShell script runs on an Azure VM every night and uses Azure CLI commands to create tags and VM resources in anoth…
Last reviewed: Jun 11, 2026
This AZ-104 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-104 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.