Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a legacy database on a single Azure virtual machine. The database is experiencing performance issues as the dataset grows. The IT team decides to increase the virtual machine size from Standard_D2s_v3 (2 vCPUs, 8 GB RAM) to Standard_D8s_v3 (8 vCPUs, 32 GB RAM) to improve performance. This process is an example of which cloud computing concept?
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
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Horizontal scaling
Horizontal scaling (scaling out) involves adding more instances of a resource, such as additional virtual machines, to distribute the load. This scenario describes increasing the size of a single VM, not adding more VMs.
B
Best answer
Vertical scaling
Vertical scaling (scaling up) increases the power of an existing resource by adding more CPU, memory, or storage. The IT team is increasing the VM size, which is a classic example of vertical scaling.
C
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Elasticity
Elasticity is the ability to automatically scale resources up or down in response to changing demand. In this scenario, the scaling is a manual, one-time change, not an automated response to demand fluctuations.
D
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High availability
High availability refers to designing an application to remain operational even if some components fail. While scaling can contribute to availability, this scenario specifically addresses performance improvement through increased capacity, not fault tolerance.
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.
Related practice questions
Related AZ-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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AZ-900 pricing and support practice questions
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AZ-900 security and compliance practice questions
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AZ-900 governance practice questions
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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: Vertical scaling — Vertical scaling (scaling up) increases the capacity of a single resource by adding more power, such as CPU, RAM, or storage. In this scenario, the company increases the size of the existing virtual machine, making it more powerful. Horizontal scaling would involve adding more virtual machines, while elasticity refers to automatically scaling resources up or down based on demand. High availability ensures the application remains accessible during failures, which is not the focus here.
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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