The answer is applying OS patches and hardening services running inside the virtual machine. In the IaaS shared responsibility model, the cloud provider secures the datacenter, hardware, storage, and hypervisor, but the customer retains full control over the guest operating system and everything deployed on top of it. This means patching the OS kernel, updating libraries, and configuring firewall rules or SELinux policies inside the VM are strictly the organization’s duties. On the Security+ SY0-701 exam, this concept frequently appears in scenario-based questions that test your ability to draw the line between provider and customer responsibilities—a common trap is confusing hypervisor patching (provider) with guest OS patching (customer). Remember the “line of demarcation” at the hypervisor: if it’s below that line, the provider owns it; if it’s above, you do. A quick memory tip: “IaaS = I Am the OS Sheriff.”
SY0-701 Security Architecture Practice Question
This SY0-701 practice question tests your understanding of security architecture. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A development team deploys a Linux web server on an IaaS cloud VM. The cloud provider secures the datacenter, hardware, and hypervisor. Which control remains the organization's responsibility?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply OS patches and harden services running inside the virtual machine.
In an IaaS model, the provider handles the physical infrastructure, storage, networking foundation, and hypervisor layer. The customer remains responsible for what runs on the VM, including the guest operating system, services, configuration, and application patching. Hardening the server inside the VM is therefore the correct answer because it is one of the core customer responsibilities in this cloud model.
Why others are wrong: Physical badge access and hypervisor patching are provider duties in IaaS, so the customer cannot rely on those as their own control. Replacing the provider backbone is outside the scope of the customer’s operational responsibility and is not how shared responsibility works. The question asks for the organization’s remaining duty, which is securing the guest OS and its applications.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Monitor physical badge access at the provider facility.
Why it's wrong here
Physical facility controls belong to the provider in this IaaS scenario, not the customer.
✓
Apply OS patches and harden services running inside the virtual machine.
Why this is correct
In IaaS, the customer still manages the guest operating system and applications, including patching and hardening.
Related concept
Static NAT maps one inside address to one outside address.
✗
Replace the provider's network backbone with a private carrier circuit.
Why it's wrong here
The customer can choose connectivity options, but does not own or replace the provider's backbone.
✗
Ensure the hypervisor is updated before every release cycle.
Why it's wrong here
Hypervisor maintenance is a provider responsibility in a typical IaaS shared responsibility model.
Common exam traps
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.
Trap categories for this question
Scenario analysis trap
Physical facility controls belong to the provider in this IaaS scenario, not the customer.
Detailed technical explanation
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.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SY0-701 NAT questions on configuration and troubleshooting.
Security Architecture — This question tests Security Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Apply OS patches and harden services running inside the virtual machine. — In an IaaS model, the provider handles the physical infrastructure, storage, networking foundation, and hypervisor layer. The customer remains responsible for what runs on the VM, including the guest operating system, services, configuration, and application patching. Hardening the server inside the VM is therefore the correct answer because it is one of the core customer responsibilities in this cloud model.
Why others are wrong: Physical badge access and hypervisor patching are provider duties in IaaS, so the customer cannot rely on those as their own control. Replacing the provider backbone is outside the scope of the customer’s operational responsibility and is not how shared responsibility works. The question asks for the organization’s remaining duty, which is securing the guest OS and its applications.
What should I do if I get this SY0-701 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SY0-701 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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