The answer is Azure Front Door with an autoscaling backend, such as Virtual Machine Scale Sets or App Service. This combination is correct because Azure Front Door provides global load balancing and traffic acceleration to distribute sudden traffic spikes across multiple regions, while the autoscaling backend automatically adjusts compute resources based on real-time CPU or request metrics, ensuring consistent performance during flash sales without manual intervention. On the AZ-900 exam, this scenario tests your understanding of how to pair a global entry point with elastic compute to handle unpredictable demand—a common trap is choosing only Front Door or only autoscaling, but the question explicitly requires both for a complete solution. Remember the memory tip: “Front Door directs, autoscale protects.”
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 e-commerce application needs to handle sudden traffic spikes during flash sales while maintaining consistent performance. Which combination of Azure services BEST addresses this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Front Door with autoscaling backend
Azure Front Door provides global load balancing and traffic acceleration with built-in SSL offload and path-based routing, while its autoscaling backend (e.g., Virtual Machine Scale Sets or App Service) automatically adds or removes instances based on CPU or request metrics. This combination ensures that sudden traffic spikes during flash sales are absorbed without manual intervention, maintaining consistent performance and high availability.
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.
✗
Azure Load Balancer with manual VM scaling
Why it's wrong here
Manual scaling cannot respond quickly enough to sudden traffic spikes.
✓
Azure Front Door with autoscaling backend
Why this is correct
Front Door provides global load balancing and CDN caching to reduce origin load; autoscaling handles backend demand spikes.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Traffic Manager with static VMs
Why it's wrong here
Traffic Manager does DNS-based routing but static VMs won't scale to handle traffic spikes.
✗
Azure CDN alone
Why it's wrong here
CDN caches static content but cannot handle dynamic requests or scale compute for application logic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Front Door (global HTTP/S load balancer with autoscaling support) with Azure Traffic Manager (DNS-only router that cannot scale backend resources), leading them to pick Option C.
Detailed technical explanation
How to think about this question
Azure Front Door uses Anycast protocol to route users to the nearest point of presence (PoP) and supports health probes and automatic failover. When combined with autoscaling (e.g., Virtual Machine Scale Sets with a scale-out rule triggered by CPU > 75% for 5 minutes), the backend can scale from 2 to 20 instances within minutes. In a real-world flash sale, Front Door’s session affinity ensures a user’s cart persists even as instances scale, preventing checkout failures.
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-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Front Door with autoscaling backend — Azure Front Door provides global load balancing and traffic acceleration with built-in SSL offload and path-based routing, while its autoscaling backend (e.g., Virtual Machine Scale Sets or App Service) automatically adds or removes instances based on CPU or request metrics. This combination ensures that sudden traffic spikes during flash sales are absorbed without manual intervention, maintaining consistent performance and high availability.
What should I do if I get this AZ-900 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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