The answer is Azure Policy with the Guest Configuration extension, as this is the only solution that provides native, continuous monitoring and automatic remediation of in-guest VM settings like registry keys, password policies, and service configurations. Azure Policy’s Guest Configuration extension works by evaluating the desired state of the VM’s operating system against your security baseline and can automatically apply remediation tasks when drift is detected, all without requiring additional infrastructure. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how Azure Policy extends beyond Azure resource management into guest-level compliance, a common trap being to confuse it with Azure Automation State Configuration, which lacks native policy integration and automated remediation. Remember the memory tip: “Policy polishes the guest” — Azure Policy handles the guest OS, while other tools like Defender for Cloud only recommend, and Update Manager only patches.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Your company has an Azure subscription that contains multiple virtual machines (VMs) running Windows Server. You need to ensure that all VMs are compliant with your organization's security baseline. The security baseline includes specific registry key settings, password policies, and service configurations. You want to continuously monitor and automatically remediate non-compliant VMs. What should you implement?
Deploy Azure Automation State Configuration to apply Desired State Configuration (DSC) to the VMs.
Why wrong: DSC can apply configurations but does not provide continuous compliance monitoring and auto-remediation as seamlessly as Guest Configuration.
B
Use Azure Policy with Guest Configuration extension to audit and remediate the VM settings.
Guest Configuration can audit and remediate OS settings.
C
Use Azure Update Manager to ensure VMs are up to date.
Why wrong: Update Manager focuses on patches, not configuration.
D
Enable Microsoft Defender for Cloud and review the security recommendations.
Why wrong: Defender for Cloud provides recommendations but not automatic remediation of specific settings.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Azure Policy with Guest Configuration extension to audit and remediate the VM settings.
Option A is correct because Azure Policy with Guest Configuration extension allows you to audit and remediate settings inside VMs, including registry keys and services. Option B is wrong because Azure Automation State Configuration is for DSC, but it requires more manual setup and does not integrate natively with Azure Policy for compliance. Option C is wrong because Microsoft Defender for Cloud provides security recommendations but not granular configuration remediation. Option D is wrong because Azure Update Manager focuses on patching, not configuration.
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.
✗
Deploy Azure Automation State Configuration to apply Desired State Configuration (DSC) to the VMs.
Why it's wrong here
DSC can apply configurations but does not provide continuous compliance monitoring and auto-remediation as seamlessly as Guest Configuration.
✓
Use Azure Policy with Guest Configuration extension to audit and remediate the VM settings.
Why this is correct
Guest Configuration can audit and remediate OS settings.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Azure Update Manager to ensure VMs are up to date.
Why it's wrong here
Update Manager focuses on patches, not configuration.
✗
Enable Microsoft Defender for Cloud and review the security recommendations.
Why it's wrong here
Defender for Cloud provides recommendations but not automatic remediation of specific settings.
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.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-100 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 SC-100 NAT questions on configuration and troubleshooting.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use Azure Policy with Guest Configuration extension to audit and remediate the VM settings. — Option A is correct because Azure Policy with Guest Configuration extension allows you to audit and remediate settings inside VMs, including registry keys and services. Option B is wrong because Azure Automation State Configuration is for DSC, but it requires more manual setup and does not integrate natively with Azure Policy for compliance. Option C is wrong because Microsoft Defender for Cloud provides security recommendations but not granular configuration remediation. Option D is wrong because Azure Update Manager focuses on patching, not configuration.
What should I do if I get this SC-100 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 SC-100 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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