Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a web application on Azure App Service. The application experiences variable traffic patterns with occasional sudden spikes. The company wants to automatically increase the number of instances during high demand and decrease them during low demand to optimize cost and performance. The solution must require no manual intervention after initial configuration. Which Azure App Service feature should the company enable?
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
Distractor review
Azure Traffic Manager
Azure Traffic Manager is a DNS-based traffic load balancer that routes traffic to different endpoints (e.g., in different regions). It does not automatically scale the number of instances of an App Service.
B
Best answer
Autoscale
Autoscale is the correct feature. It automatically increases or decreases the number of App Service instances based on metric thresholds or schedules, aligning with the requirement to handle sudden spikes and optimize costs without manual intervention.
C
Distractor review
Azure Load Balancer
Azure Load Balancer distributes incoming network traffic across healthy virtual machines or instances to ensure availability. It does not automatically change the number of instances; it only distributes traffic among existing instances.
D
Distractor review
Availability Zones
Availability Zones protect applications from datacenter failures by replicating instances across physically separate zones within an Azure region. While they improve availability, they do not automatically scale instances based on demand.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Autoscale — Autoscaling is a built-in feature of Azure App Service that automatically adjusts the number of running instances based on predefined rules and metrics, such as CPU usage or request count. This ensures the application can handle traffic spikes without manual intervention and reduces costs during periods of low demand. The other options offer different capabilities: Azure Traffic Manager routes traffic across endpoints, Azure Load Balancer distributes traffic within a region, and Availability Zones provide high availability by replicating across physically separate datacenters.
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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