Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A company runs its customer relationship management (CRM) system using a cloud provider's SaaS offering. They also use virtual machines (IaaS) from the same provider to host a legacy application. In this scenario, who is responsible for patching the operating system of the virtual machines?
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
The cloud provider is fully responsible for patching all components.
In IaaS, the provider patches the physical infrastructure and hypervisor, but the customer patches the guest OS and applications. For SaaS, the provider handles everything, but the VMs are IaaS.
B
Best answer
The customer is responsible for patching the operating system of the virtual machines.
In the IaaS model, the customer manages the OS and applications on the VM, including applying security patches. The provider manages the underlying physical infrastructure.
C
Distractor review
The cloud provider patches the OS for all services equally.
This is not accurate. In IaaS, the customer patches the OS; in SaaS, the provider patches everything. The responsibility is not equal across all service models.
D
Distractor review
No patching is needed because the cloud handles everything.
This is false. Even in the cloud, patching is necessary, and the responsibility depends on the service model. IaaS requires customer OS patching.
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 MS-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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Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this MS-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: The customer is responsible for patching the operating system of the virtual machines. — This scenario combines SaaS (CRM) and IaaS (VMs). In the IaaS model, the cloud provider is responsible for the physical infrastructure, networking, and hypervisor, but the customer is responsible for securing and patching the guest operating system and applications running on the VMs. For the SaaS CRM, the provider handles all maintenance. The question specifically asks about the VMs, so the customer is responsible.
What should I do if I get this MS-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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