The answer is to enable a managed identity for the web app. This is correct because managed identities provide an automatically managed service principal in Microsoft Entra ID, allowing the web app to authenticate to Azure Key Vault without storing any connection strings or secrets in code. The identity is tied to the app’s lifecycle, so developers never handle credentials. On the AZ-204 exam, this scenario tests your understanding of secure secret retrieval without hardcoding—a common trap is confusing managed identities with service principals, which require manual secret management. Remember the memory tip: “Managed means no manual secrets.” This concept frequently appears in exam questions about configuring Key Vault access policies and linking them to Azure resources like App Services or Functions.
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company stores secrets in Azure Key Vault. Developers need to retrieve secrets from a web app without storing connection strings in code. Which authentication method should the web app use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable a managed identity for the web app
Managed identities provide an automatically managed identity in Microsoft Entra ID for the app to authenticate to any service supporting Entra ID authentication, including Key Vault, without storing credentials. Option A is wrong because SAS tokens are for storage accounts, not Key Vault. Option B is wrong because service principals require managing secrets or certificates. Option D is wrong because certificate thumbprints are used with service principals, not directly.
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.
✗
Register a service principal and use a client secret
Why it's wrong here
Service principals require managing client secrets, which introduces credential storage.
✓
Enable a managed identity for the web app
Why this is correct
Managed identities allow the app to authenticate to Key Vault without storing credentials.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a shared access signature (SAS) token
Why it's wrong here
SAS tokens are used for Azure Storage, not Key Vault.
✗
Use a certificate thumbprint in the app settings
Why it's wrong here
Certificate thumbprints are used with service principals, not directly for authentication.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 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 AZ-204 NAT questions on configuration and troubleshooting.
Implement Azure security — This question tests Implement Azure security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable a managed identity for the web app — Managed identities provide an automatically managed identity in Microsoft Entra ID for the app to authenticate to any service supporting Entra ID authentication, including Key Vault, without storing credentials. Option A is wrong because SAS tokens are for storage accounts, not Key Vault. Option B is wrong because service principals require managing secrets or certificates. Option D is wrong because certificate thumbprints are used with service principals, not directly.
What should I do if I get this AZ-204 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 AZ-204 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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Question Discussion
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