The answer is to configure Availability Zones and enable autoscaling on the Virtual Machine Scale Set. This combination is correct because Availability Zones physically isolate VM instances across independent datacenters within a region, ensuring the stateless web service remains available even if an entire datacenter fails, while VMSS autoscaling automatically adjusts the instance count based on demand metrics like CPU or memory, handling peak-hour traffic without manual intervention. On the AZ-104 exam, this scenario tests your understanding of how VMSS integrates zone-level resilience with elastic scaling, often appearing as a paired-configuration question where a common trap is selecting a single zone or a regional deployment without zones, which would not survive a datacenter outage. Remember the memory tip: “Zones for survival, scaling for arrival”—zones keep you alive during failures, scaling handles the traffic surge.
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.
A stateless web service runs on identical VMs and must keep serving traffic if Microsoft takes one datacenter out of service in the region. The load must also scale out automatically during peak hours, and instances should be spread across independent zone boundaries. Which two configurations should the administrator use? Select two.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Virtual machine scale set
A is correct because Virtual Machine Scale Sets (VMSS) provide built-in autoscaling capabilities that automatically adjust the number of VM instances based on demand (e.g., CPU or memory metrics), ensuring the web service scales out during peak hours. Additionally, VMSS supports spreading instances across availability zones, which protects against a single datacenter failure by distributing VMs across independent zone boundaries within a region.
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.
✓
Virtual machine scale set
Why this is correct
This supports automatic scale-out and simplifies running multiple identical VM instances.
Related concept
Read the scenario before looking for a memorised answer.
✓
Availability zones
Why this is correct
These provide protection from a single datacenter outage by placing workloads in separate zones.
Related concept
Read the scenario before looking for a memorised answer.
✗
Availability set
Why it's wrong here
Availability sets protect against host and maintenance issues, but not an entire zone outage.
✗
Proximity placement group
Why it's wrong here
This improves latency by placing resources close together and does not provide zone-level resilience.
✗
Dedicated host
Why it's wrong here
A dedicated host isolates placement on physical hardware, but it is not the requested scaling or zone design.
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-level failures within one datacenter) with Availability Zones (which protect against full datacenter outages), leading them to select Availability Set instead of Availability Zones for cross-datacenter resilience.
Detailed technical explanation
How to think about this question
Under the hood, VMSS uses an autoscale profile with rules based on metrics like average CPU percentage or queue length, triggering scale-out/scale-in operations via the Azure Resource Manager API. When configured with availability zones, VMSS uses the zone property to distribute VM instances across distinct physical locations, each with independent power, cooling, and networking, ensuring an SLA of 99.99% for multi-zone deployments. A real-world scenario is an e-commerce site that automatically adds 50 instances during Black Friday traffic spikes while maintaining service if an entire zone fails.
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: Virtual machine scale set — A is correct because Virtual Machine Scale Sets (VMSS) provide built-in autoscaling capabilities that automatically adjust the number of VM instances based on demand (e.g., CPU or memory metrics), ensuring the web service scales out during peak hours. Additionally, VMSS supports spreading instances across availability zones, which protects against a single datacenter failure by distributing VMs across independent zone boundaries within a region.
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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