The answer is availability zone. An availability zone protects against an entire datacenter failure by placing your single VM in a physically separate location within the region, with its own independent power, cooling, and networking—ensuring the workload continues running even if one entire datacenter goes offline. In contrast, an availability set only guards against rack-level failures within the same datacenter, so it cannot survive a full datacenter outage. On the AZ-104 exam, this distinction tests your understanding of fault domain isolation at the datacenter versus rack level; a common trap is choosing an availability set because it sounds like it covers “availability,” but it lacks the cross-datacenter protection you need here. For a single VM, remember the memory tip: “Zone for the zone-wide outage, set for the server rack setback.”
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.
A production workload must continue running if one entire Azure datacenter in the region becomes unavailable. The region supports availability zones, and you want the strongest placement option for a single VM. What should you choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Availability zone
An availability zone protects against an entire datacenter failure by placing the VM in a physically separate zone within the region, each with independent power, cooling, and networking. This is the strongest placement option for a single VM because it guarantees isolation from other zones, ensuring the workload continues if one datacenter fails. Availability sets only protect against rack-level failures within the same datacenter, not a full datacenter outage.
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.
✓
Availability zone
Why this is correct
An availability zone places the VM in a separate datacenter within the region, helping protect against a full datacenter failure.
Related concept
Read the scenario before looking for a memorised answer.
✗
Availability set
Why it's wrong here
An availability set protects against host maintenance and hardware faults, but it does not protect against a whole datacenter outage.
✗
Proximity placement group
Why it's wrong here
A proximity placement group reduces latency by placing resources close together, but it is not a resiliency feature.
✗
Managed disk snapshot
Why it's wrong here
A snapshot helps with recovery of disk data, but it does not keep a running VM available during a datacenter failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse availability sets (which protect against rack failures) with availability zones (which protect against datacenter failures), leading them to choose the cheaper or more familiar option without recognizing the requirement for full datacenter resilience.
Detailed technical explanation
How to think about this question
Availability zones in Azure are physically separate locations within an Azure region, each with independent infrastructure (power, cooling, networking) and a minimum latency of 2-4 ms between zones. For a single VM, deploying it in an availability zone ensures a 99.99% SLA (when combined with premium managed disks), whereas an availability set offers only 99.95% SLA. Under the hood, Azure uses zone-redundant services like zone-pinned IP addresses and load balancers to route traffic away from a failed zone, but for a single VM, the VM itself must be deployed into a specific zone to survive that zone's failure.
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: Availability zone — An availability zone protects against an entire datacenter failure by placing the VM in a physically separate zone within the region, each with independent power, cooling, and networking. This is the strongest placement option for a single VM because it guarantees isolation from other zones, ensuring the workload continues if one datacenter fails. Availability sets only protect against rack-level failures within the same datacenter, not a full datacenter outage.
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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