Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A retail company runs an e-commerce application on Azure virtual machines during peak holiday seasons. The application experiences high traffic for a few weeks each year. The IT team wants to automatically provision additional compute resources during high demand and remove them when demand drops, ensuring that the company only pays for resources while they are actively in use. Which cloud computing characteristic does this approach primarily rely on?
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
Elasticity
Elasticity is correct. It refers to the ability to automatically scale resources up or down based on real-time demand, ensuring you only pay for what you use. This matches the scenario of adding resources during holiday peaks and removing them afterward.
B
Distractor review
Scalability
Scalability is a related concept that focuses on increasing capacity to handle growing workloads over time, but it does not inherently include the ability to automatically reduce resources when demand decreases. Elasticity adds the dynamic bi-directional scaling, which is required here.
C
Distractor review
High availability
High availability ensures that applications remain accessible despite component failures, typically by using redundancy and failover. It does not address the automatic provisioning or deprovisioning of resources based on demand, which is the core requirement in this scenario.
D
Distractor review
Fault tolerance
Fault tolerance enables a system to continue operating without interruption even if one or more components fail. While important for reliability, it does not describe the ability to dynamically adjust capacity in response to changing demand, which is the primary need here.
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: Elasticity — Elasticity is the cloud characteristic that enables resources to be automatically scaled out (provisioned) during demand spikes and scaled in (deprovisioned) when demand falls, allowing you to pay only for what you use. While scalability refers to the ability to increase capacity to handle growing workloads, elasticity specifically addresses the ability to both increase and decrease resources dynamically in response to changing demand, which is crucial for unpredictable or seasonal traffic patterns.
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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