Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
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
Distractor review
Scale up the App Service plan to a Premium tier for more resources.
Scaling up increases performance per instance but is more expensive; scaling out is typically more cost-effective for temporary load.
C
Distractor review
Enable autoscale on the existing plan to let Azure handle scaling automatically.
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
Distractor review
Deploy Azure CDN to cache static content.
CDN improves performance for static content delivery but does not increase compute capacity to handle more concurrent users.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?
Question 2
A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)
Question 3
A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?
Question 4
A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?
Question 5
A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?
Question 6
A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?
FAQ
Questions learners often ask
What does this AZ-900 question test?
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. — App Service plans can be scaled out by increasing the number of VM instances (scale out) or scaled up by moving to a larger plan (scale up). Scaling out is generally more cost-effective for handling variable load as you can add instances and remove them as needed. The Standard tier supports manual scale out (or autoscale). The Premium tier is more expensive. Autoscale is a feature of the plan but requires configuration. The correct immediate action for minimal cost is to manually scale out the app by increasing instance count, or configure autoscale to handle the expected traffic. However, the best answer among the options is to scale out the plan by increasing the number of instances (option A). Option B (scale up to Premium) increases cost unnecessarily, option C (enable autoscale) requires an upfront configuration but not an action to handle immediate doubling, option D (add a CDN) improves latency but does not increase compute capacity.
What should I do if I get this AZ-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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