The answer is Azure Key Vault with managed identities for AKS because this combination enables secure, runtime secret retrieval without ever storing credentials in code, configuration files, or environment variables. By assigning an Azure Managed Identity to the AKS cluster, the application can authenticate directly to Key Vault via Microsoft Entra ID, eliminating the need for service principal secrets or manual key rotation. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of identity-based access control versus static credential management—a common trap is choosing Kubernetes Secrets, which lack native encryption and require complex RBAC to secure. Remember that native Azure integration minimizes administrative overhead, while third-party tools like HashiCorp Vault add unnecessary complexity for a cloud-native solution. Memory tip: think “Key Vault + Managed Identity = no secrets to steal.”
SC-100 Practice Question: Design security solutions for applications and data
This SC-100 practice question tests your understanding of design security solutions for applications and data. 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.
You are designing a solution to securely store and manage secrets for a cloud-native application deployed on Azure Kubernetes Service (AKS). The application needs to retrieve database connection strings and API keys at runtime without hardcoding them. The solution must minimize administrative overhead and integrate with Azure Active Directory (now Microsoft Entra ID) for access control. Which service should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Key Vault with managed identities
Option C is correct: Azure Key Vault with managed identities for AKS allows secure secret retrieval without storing credentials in code or configuration, integrates with Entra ID, and minimizes overhead. Option A is wrong: Kubernetes Secrets are not encrypted by default and require additional configuration. Option B is wrong: Azure App Configuration can store configuration but is not optimized for secrets. Option D is wrong: HashiCorp Vault adds complexity and is not a native Azure service.
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.
✗
Kubernetes Secrets
Why it's wrong here
Kubernetes Secrets are base64-encoded, not encrypted by default, and require additional management.
✗
HashiCorp Vault on AKS
Why it's wrong here
HashiCorp Vault is a third-party tool that adds operational overhead.
✓
Azure Key Vault with managed identities
Why this is correct
Key Vault securely stores secrets, and managed identities provide secure access without credentials.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Azure App Configuration
Why it's wrong here
App Configuration is for configuration settings, not secrets; it lacks key rotation and access policies.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 applications and data — This question tests Design security solutions for applications and data — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Azure Key Vault with managed identities — Option C is correct: Azure Key Vault with managed identities for AKS allows secure secret retrieval without storing credentials in code or configuration, integrates with Entra ID, and minimizes overhead. Option A is wrong: Kubernetes Secrets are not encrypted by default and require additional configuration. Option B is wrong: Azure App Configuration can store configuration but is not optimized for secrets. Option D is wrong: HashiCorp Vault adds complexity and is not a native Azure service.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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