- A
Availability set
Why wrong: Availability sets protect against host and maintenance events within a datacenter, but they do not span separate zones.
- B
Availability zones
Availability zones place resources in physically separate datacenters within the same Azure region. That gives the application protection against a full datacenter failure, which is the scenario described. When the workload must survive a zone outage, zones are the right resiliency choice rather than a same-datacenter availability set.
- C
Proximity placement group
Why wrong: Proximity placement groups reduce latency between resources, but they do not provide datacenter-level resiliency.
- D
Azure Load Balancer
Why wrong: A load balancer distributes traffic, but it does not itself provide protection from a datacenter outage.
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 customer-facing application runs on two Azure VMs. The business wants the application to stay available even if one datacenter in the Azure region has an outage. Which availability option should the administrator use?
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
Availability zones
Availability Zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. By deploying the two VMs into different zones, the application remains available if one entire datacenter fails, meeting the requirement for datacenter-level fault tolerance.
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 set
Why it's wrong here
Availability sets protect against host and maintenance events within a datacenter, but they do not span separate zones.
When this WOULD be correct
An administrator needs to ensure high availability for two VMs within a single datacenter, protecting against hardware failures or updates within the same datacenter. The question would specify 'within a single datacenter' or 'rack-level failure'.
- ✓
Availability zones
Why this is correct
Availability zones place resources in physically separate datacenters within the same Azure region. That gives the application protection against a full datacenter failure, which is the scenario described. When the workload must survive a zone outage, zones are the right resiliency choice rather than a same-datacenter availability set.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Proximity placement group
Why it's wrong here
Proximity placement groups reduce latency between resources, but they do not provide datacenter-level resiliency.
When this WOULD be correct
A question asks: 'An application requires the lowest possible network latency between two VMs for a high-performance computing workload. Which option should be used?' In that scenario, a proximity placement group is correct because it ensures VMs are in the same datacenter to minimize latency.
- ✗
Azure Load Balancer
Why it's wrong here
A load balancer distributes traffic, but it does not itself provide protection from a datacenter outage.
When this WOULD be correct
An administrator needs to distribute incoming traffic across multiple VMs in the same region to improve application responsiveness and provide fault tolerance for VM-level failures, but the question does not require protection against a full datacenter outage.
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.
✓Availability zonesCorrect answer▾
Why this is correct
Availability zones place resources in physically separate datacenters within the same Azure region. That gives the application protection against a full datacenter failure, which is the scenario described. When the workload must survive a zone outage, zones are the right resiliency choice rather than a same-datacenter availability set.
✗Availability setWrong answer — click to see why▾
Why this is wrong here
Availability sets protect against rack-level failures within a single datacenter, not against an entire datacenter outage. They do not provide cross-datacenter redundancy.
★ When this WOULD be the correct answer
An administrator needs to ensure high availability for two VMs within a single datacenter, protecting against hardware failures or updates within the same datacenter. The question would specify 'within a single datacenter' or 'rack-level failure'.
Why candidates choose this
Candidates often confuse availability sets with availability zones, thinking both provide datacenter-level redundancy, but availability sets only protect against failures within one datacenter.
✗Proximity placement groupWrong answer — click to see why▾
Why this is wrong here
Proximity placement groups reduce network latency by keeping VMs close together, but they do not protect against datacenter-level outages. The question requires resilience across datacenters, which proximity placement groups cannot provide.
★ When this WOULD be the correct answer
A question asks: 'An application requires the lowest possible network latency between two VMs for a high-performance computing workload. Which option should be used?' In that scenario, a proximity placement group is correct because it ensures VMs are in the same datacenter to minimize latency.
Why candidates choose this
Candidates may confuse the goal of high availability with low latency, thinking that grouping VMs closely together ensures availability, but proximity placement groups actually increase the risk of simultaneous failure.
✗Azure Load BalancerWrong answer — click to see why▾
Why this is wrong here
Azure Load Balancer distributes traffic across VMs but does not protect against a datacenter outage within a region; it requires VMs in separate availability zones or regions to provide that resilience.
★ When this WOULD be the correct answer
An administrator needs to distribute incoming traffic across multiple VMs in the same region to improve application responsiveness and provide fault tolerance for VM-level failures, but the question does not require protection against a full datacenter outage.
Why candidates choose this
Candidates may think a load balancer inherently provides high availability across datacenters, but it only distributes load; without VMs in separate zones, it cannot survive a zone failure.
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 confuse Availability Sets (which protect against rack-level failures within one datacenter) with Availability Zones (which protect against full datacenter outages), leading them to choose the cheaper but insufficient option A.
Detailed technical explanation
How to think about this question
Availability Zones offer a 99.99% SLA for VMs when two or more instances are deployed across zones, compared to 99.95% for an Availability Set. Each zone is a unique physical location with its own subnets and IP address ranges; the zone ID is mapped to the VM's virtual network interface. In a real-world scenario, if Zone 1 experiences a cooling failure, VMs in Zone 2 remain unaffected, and the Load Balancer (if configured with zone-redundant frontend) automatically directs traffic to the healthy zone.
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.
What to study next
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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: Availability zones — Availability Zones are physically separate datacenters within an Azure region, each with independent power, cooling, and networking. By deploying the two VMs into different zones, the application remains available if one entire datacenter fails, meeting the requirement for datacenter-level fault tolerance.
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.
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 →
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Last reviewed: Jun 11, 2026
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