Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is migrating a custom line-of-business application to Azure. The application handles sensitive customer data. The IT team is evaluating whether to deploy the application on Azure Virtual Machines (IaaS) or Azure App Service (PaaS). They want to understand the division of security responsibilities between Microsoft and the customer under the shared responsibility model. Which responsibility remains the customer's obligation regardless of whether they choose IaaS, PaaS, or SaaS?
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
Applying operating system security patches and updates to virtual machines
Incorrect. OS patching is the customer's responsibility only in IaaS. In PaaS (e.g., Azure App Service), the cloud provider manages the underlying OS. In SaaS, the provider handles all patching. Therefore, this is not a responsibility that remains constant across all models.
B
Distractor review
Managing the physical server hardware, network switches, and datacenter cooling
Incorrect. Physical infrastructure management is always the responsibility of the cloud provider (Microsoft) in all cloud service models. Customers never manage physical hardware except in on-premises private cloud scenarios.
C
Distractor review
Configuring and maintaining the application-level network load balancer for high availability
Incorrect. While a customer can configure load balancers in IaaS, in PaaS (like Azure App Service) the platform provides built-in load balancing managed by the provider. In SaaS, load balancing is entirely provided by the vendor. Thus, this responsibility varies by model.
D
Best answer
Managing user access to the application data and ensuring data classification policies are enforced
Correct. The customer always owns their data and identities, regardless of the service model. Data classification, access control, and identity management are perpetual customer responsibilities. Even in SaaS, the customer must manage who has access to the application and what data they can see.
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.
Related 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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Managing user access to the application data and ensuring data classification policies are enforced — In the shared responsibility model, the customer is always responsible for managing and securing their own data, user identities, and access permissions, regardless of which cloud service model (IaaS, PaaS, or SaaS) is used. For IaaS, the customer also manages the OS and middleware. For PaaS, the provider manages the runtime and OS, but the customer still controls data and access. For SaaS, the provider manages everything except data, identities, and access. Therefore, managing user access to data and ensuring data classification policies is a constant customer responsibility.
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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