Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company deploys a custom web application on Azure App Service (PaaS). The application stores user data in Azure SQL Database. The security team is responsible for securing the application code, managing authentication, and configuring TLS for data in transit. According to the Microsoft shared responsibility model, which security responsibility remains with Microsoft for this PaaS deployment?
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
Patching the operating system of the underlying physical and virtual hosts
In PaaS, Microsoft is responsible for maintaining and patching the host OS and infrastructure, freeing the customer from managing these layers.
B
Distractor review
Configuring the firewall rules for the web application
Firewall rules for the web application (e.g., Azure App Service access restrictions) are customer-managed to control inbound and outbound traffic.
C
Distractor review
Managing user access to the application
User authentication and authorization are application-level responsibilities managed by the customer using Microsoft Entra ID or other identity systems.
D
Distractor review
Encrypting the application data at rest in Azure SQL Database
While Microsoft provides transparent data encryption (TDE) for Azure SQL Database, the customer can choose to use it and manage encryption keys, making encryption at rest a shared or customer responsibility depending on configuration.
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
Related SC-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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 company must retain all customer contracts for 10 years to comply with industry regulations. After 10 years, the contracts must be permanently deleted. Which Microsoft Purview solution should be used to automate this process?
Question 2
A company uses a cloud-based SaaS (Software as a Service) application for customer relationship management. According to the shared responsibility model, which security responsibility is primarily handled by the customer?
Question 3
A company runs a mix of on-premises servers and Azure virtual machines. They deploy Microsoft Defender for Endpoint on all servers. The security team wants to create custom queries to hunt for a specific attack pattern that involves a sequence of events across multiple machines, such as a PowerShell script being downloaded and then executed on several servers. They need to write their own detection rules based on advanced hunting data. Which Microsoft 365 Defender capability should they use?
Question 4
A company runs a consumer-facing e-commerce website and wants to allow customers to sign in using their existing social media accounts such as Google, Facebook, or LinkedIn. Which Microsoft Entra ID solution should they implement?
Question 5
A company has a hybrid identity environment with Active Directory synchronizing to Microsoft Entra ID. They want users to be able to reset their own on-premises passwords via the cloud SSPR portal. What is the minimum license required for this capability?
Question 6
A company uses a cloud-based Customer Relationship Management (CRM) system that is delivered as Software-as-a-Service (SaaS). According to the shared responsibility model, which security responsibility is primarily handled by the customer?
FAQ
Questions learners often ask
What does this SC-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: Patching the operating system of the underlying physical and virtual hosts — For Platform as a Service (PaaS) like Azure App Service and Azure SQL Database, Microsoft manages the underlying infrastructure, including the physical hardware, network controls, and the operating system of the host machines. This includes patching the OS of the virtual machines that host the service. The customer is responsible for securing their application code, managing access (identity), and protecting their data. While Microsoft provides infrastructure-level encryption, the customer is often responsible for configuring encryption at rest for their databases. Option D is not a clear Microsoft responsibility because encryption at rest can be customer-managed or platform-managed depending on configuration, and the question asks for a responsibility that remains with Microsoft regardless.
What should I do if I get this SC-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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