Question 498 of 1,031

Describe Azure architecture and services →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to scale out the App Service plan by increasing the instance count. Scaling out, or horizontal scaling, distributes the doubled traffic across multiple identical instances, preventing performance degradation without changing the underlying resource power of each instance. This is cost-effective because the Standard tier supports manual scale-out without requiring a more expensive tier upgrade, and you only pay for the additional instances while they are needed. On the AZ-900 exam, this scenario tests your understanding of the difference between scaling up (vertical scaling, which increases CPU/memory by moving to a higher tier) and scaling out (horizontal scaling, which adds more instances). A common trap is choosing to scale up, which would incur higher ongoing costs for a more powerful plan even when traffic returns to normal. Remember the memory tip: “Out for more, Up for power”—when traffic spikes, scale out to add more servers, not a bigger server.

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 deploys a web application on Azure App Service. During a marketing campaign, they expect traffic to double. The app uses a Standard tier App Service plan. They want to ensure that the additional load is handled without performance degradation while keeping costs minimal. Which action should they take?

Question 1hardmultiple choice

Full question →

A
Scale out the App Service plan by increasing the instance count.
Scaling out adds more VM instances to handle increased load, is cost-effective, and can be done manually or via autoscale.
B
Scale up the App Service plan to a Premium tier for more resources.
Why wrong: Scaling up increases performance per instance but is more expensive; scaling out is typically more cost-effective for temporary load.
C
Enable autoscale on the existing plan to let Azure handle scaling automatically.
Why wrong: Autoscale is a good practice for the future, but to handle an expected doubling of traffic, you would need to configure it in advance; the question asks for an action to take now.
D
Deploy Azure CDN to cache static content.
Why wrong: CDN improves performance for static content delivery but does not increase compute capacity to handle more concurrent users.

Full breakdown with real-world context →

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

✓

Scale out the App Service plan by increasing the instance count.

Scaling out (increasing instance count) for the Standard tier App Service plan allows the application to handle the doubled traffic by distributing requests across multiple instances, ensuring no performance degradation. This approach is cost-minimal because the Standard tier supports manual scale-out without requiring a tier upgrade, and you only pay for the additional instances while they are needed.

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.

✓
Scale out the App Service plan by increasing the instance count.
Why this is correct
Scaling out adds more VM instances to handle increased load, is cost-effective, and can be done manually or via autoscale.
Related concept
Read the scenario before looking for a memorised answer.
✗
Scale up the App Service plan to a Premium tier for more resources.
Why it's wrong here
Scaling up increases performance per instance but is more expensive; scaling out is typically more cost-effective for temporary load.
✗
Enable autoscale on the existing plan to let Azure handle scaling automatically.
Why it's wrong here
Autoscale is a good practice for the future, but to handle an expected doubling of traffic, you would need to configure it in advance; the question asks for an action to take now.
✗
Deploy Azure CDN to cache static content.
Why it's wrong here
CDN improves performance for static content delivery but does not increase compute capacity to handle more concurrent users.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse 'scaling up' (increasing resources per instance) with 'scaling out' (adding more instances), and assume autoscale is available on all tiers, but Azure restricts autoscale to Premium and higher tiers, making manual scale-out the correct cost-minimal choice for Standard tier.

Detailed technical explanation

How to think about this question

Under the hood, Azure App Service scaling out creates additional VM instances behind the load balancer, each running the same application code. The Standard tier supports up to 10 instances (or more with a support ticket), and manual scaling is immediate. In a real-world scenario, during a marketing campaign, you might scale out to 2-3 instances temporarily, then scale back down after the campaign ends—this is more cost-effective than permanently upgrading to Premium tier, which also incurs higher base costs even when idle.

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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this AZ-900 question test?

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: Scale out the App Service plan by increasing the instance count. — Scaling out (increasing instance count) for the Standard tier App Service plan allows the application to handle the doubled traffic by distributing requests across multiple instances, ensuring no performance degradation. This approach is cost-minimal because the Standard tier supports manual scale-out without requiring a tier upgrade, and you only pay for the additional instances while they are needed.

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.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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