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.
A company needs to host a website that must automatically scale to handle millions of concurrent users during peak events. Which Azure architecture BEST supports this?
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 App Service with autoscaling and Azure Front Door
Azure App Service with autoscaling and Azure Front Door is the best choice because it provides a fully managed platform for web applications that can automatically scale out (add instances) based on demand, while Azure Front Door offers global load balancing and acceleration at Layer 7 (HTTP/HTTPS) to distribute traffic across multiple regions. This combination ensures the website can handle millions of concurrent users during peak events without manual intervention.
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.
✗
Single Azure VM with manual scaling
Why it's wrong here
A single VM can't auto-scale and manual scaling is too slow to respond to sudden traffic spikes.
✓
Azure App Service with autoscaling and Azure Front Door
Why this is correct
App Service autoscaling handles compute demand spikes; Front Door distributes traffic globally and caches content at the edge.
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 Blob Storage static website
Why it's wrong here
Static website hosting works for static content but can't handle dynamic application logic or user-specific content.
✗
Azure VMs without load balancing
Why it's wrong here
VMs without load balancing create single points of failure and can't distribute traffic across instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Azure Blob Storage static websites (Option C) because they think 'static' implies high scalability, but they overlook the lack of dynamic processing and autoscaling capabilities required for concurrent user handling.
Detailed technical explanation
How to think about this question
Under the hood, Azure App Service autoscaling uses metrics like CPU percentage, memory usage, or HTTP queue length to trigger scale-out operations via the Azure Monitor autoscale engine, which can add instances in minutes. Azure Front Door uses Anycast-based routing and a global edge network to terminate TLS connections close to users, reducing latency and offloading traffic from the origin. In a real-world scenario, a retail website during Black Friday could use this architecture to automatically scale from 10 to 500 instances while Front Door handles millions of concurrent connections across regions.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 App Service with autoscaling and Azure Front Door — Azure App Service with autoscaling and Azure Front Door is the best choice because it provides a fully managed platform for web applications that can automatically scale out (add instances) based on demand, while Azure Front Door offers global load balancing and acceleration at Layer 7 (HTTP/HTTPS) to distribute traffic across multiple regions. This combination ensures the website can handle millions of concurrent users during peak events without manual intervention.
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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