AZ-104 Monitor and Maintain Azure Resources Practice Question
An admin enables backup on a newly deployed Azure VM, but every backup job fails immediately with a message that the VM agent is not ready. What should the administrator verify first?
⚠ Common exam trap
Many exam-takers assume network connectivity (public IP or load balancer) is the root cause, but the immediate failure message 'VM agent not ready' directly points to the agent status, not network issues.
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
✓
The Azure VM Agent is installed, running, and able to provision backup-related extensions.
The Azure VM Agent (also known as the Windows Guest Agent or Linux Agent) is required for the Azure Backup service to install the backup extension (e.g., IaaSBcdrExtension for Windows or SnapshotV2 for Linux). If the agent is not installed, not running, or is in a 'Not Ready' state, the backup extension cannot be provisioned, causing immediate failure. The administrator should first verify that the VM Agent is installed and its status is 'Ready' in the VM's properties.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The VM is placed in an availability zone that supports backup.
Why it's wrong here
Azure Backup is a regional service and operates uniformly across all availability zones within a supported Azure region; no zone-specific limitation prevents backup extension provisioning or recovery point creation. Availability zone placement defines the physical fault and update domain isolation of the VM's underlying hardware, which is unrelated to the health of the guest-level Azure VM Agent. The reported error is about agent readiness, and the first troubleshooting step should be checking the VM agent status inside the guest OS, not confirming zone support. Thus, checking the availability zone would be a misdirected and ineffective action.
When this WOULD be correct
This option would be correct if the question stated that backup jobs fail with a message about 'unsupported region' or 'backup not available in this zone', indicating a regional or zonal limitation for the backup service.
- ✓
The Azure VM Agent is installed, running, and able to provision backup-related extensions.
Why this is correct
Azure Backup relies on the VM agent and extensions inside the guest. If the agent is missing, stopped, or unhealthy, backup jobs can fail before a recovery point is created. Verifying the agent first addresses the specific error message.
- ✗
The VM has a public IP address assigned for outbound connectivity.
Why it's wrong here
Azure Backup does not require the VM to have a public IP address assigned. The Azure VM Agent and backup extensions communicate outbound to Azure public endpoints, and this outbound connectivity can be provided through default outbound access, a NAT gateway, or forced tunneling, making a public IP only one possible—not mandatory—method. The error in the scenario specifically references the VM agent's operational state inside the guest OS, not the VM's lack of internet egress. Adding or removing a public IP would not repair an agent that is stopped, uninstalled, or unhealthy.
When this WOULD be correct
If the question were about a VM that fails to download custom scripts or extensions from the internet (e.g., custom script extension), then a public IP or outbound connectivity would be the first thing to verify.
- ✗
The VM is added to a load balancer backend pool.
Why it's wrong here
Adding a VM to a load balancer backend pool is a networking configuration that determines how inbound traffic is distributed to the VM's IP address. This has no interaction with the Azure VM Agent or the provisioning of backup extensions, which are guest-level components managed by the Azure fabric. The backup extension is installed via the VM agent using outbound HTTPS to Azure control plane endpoints, and this traffic path is independent of load balancer membership. Therefore, membership in a backend pool would not cause or resolve a 'VM agent not ready' backup error.
When this WOULD be correct
This option would be correct in a scenario where a VM is unreachable from the internet and needs to be added to a load balancer's backend pool to receive traffic, such as when configuring a highly available web application.
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.
✓The Azure VM Agent is installed, running, and able to provision backup-related extensions.Correct answer▾
Why this is correct
Azure Backup relies on the VM agent and extensions inside the guest. If the agent is missing, stopped, or unhealthy, backup jobs can fail before a recovery point is created. Verifying the agent first addresses the specific error message.
✗The VM is placed in an availability zone that supports backup.Wrong answer — click to see why▾
Why this is wrong here
Backup failures due to VM agent not ready indicate an issue with the agent itself, not the availability zone. Azure Backup supports all availability zones, so zone placement does not cause immediate backup failures.
★ When this WOULD be the correct answer
This option would be correct if the question stated that backup jobs fail with a message about 'unsupported region' or 'backup not available in this zone', indicating a regional or zonal limitation for the backup service.
Why candidates choose this
Candidates may confuse availability zone constraints with backup readiness, thinking that backup requires specific zone support, but Azure Backup is zone-agnostic.
✗The VM has a public IP address assigned for outbound connectivity.Wrong answer — click to see why▾
Why this is wrong here
Outbound connectivity via a public IP is not required for Azure Backup to function; the VM agent communicates internally with Azure storage endpoints, and backup can work through a private endpoint or service endpoint.
★ When this WOULD be the correct answer
If the question were about a VM that fails to download custom scripts or extensions from the internet (e.g., custom script extension), then a public IP or outbound connectivity would be the first thing to verify.
Why candidates choose this
Candidates may mistakenly think backup requires internet access, confusing it with scenarios where VMs need outbound connectivity for updates or extension downloads from public repositories.
✗The VM is added to a load balancer backend pool.Wrong answer — click to see why▾
Why this is wrong here
Adding a VM to a load balancer backend pool is unrelated to backup failures caused by the VM agent not being ready. Backup operations depend on the VM agent and extensions, not load balancing configuration.
★ When this WOULD be the correct answer
This option would be correct in a scenario where a VM is unreachable from the internet and needs to be added to a load balancer's backend pool to receive traffic, such as when configuring a highly available web application.
Why candidates choose this
Candidates might think that load balancing is required for backup traffic or that the VM must be part of a pool to be properly managed, confusing network load balancing with backup infrastructure requirements.
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?”
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.