The correct answer is to enable managed identity for the application and grant it access to Azure Cosmos DB via Azure RBAC. This approach eliminates the need for static master keys by allowing the application to authenticate to Azure Cosmos DB using Azure AD, which improves security by removing hardcoded credentials and ensuring that only authorized identities can access the data. On the AZ-500 exam, this scenario tests your understanding of how to use managed identity to authenticate Azure Cosmos DB without relying on keys, often appearing as a trap where candidates confuse network controls like firewalls or private endpoints with identity-based access. A common mistake is choosing resource tokens, but those are designed for per-user, granular access, not for application-level authentication. Remember the mnemonic “MIA for RBAC” — Managed Identity Authentication replaces keys with Role-Based Access Control.
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. 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 uses Azure Cosmos DB with SQL API to store user profiles. They need to ensure that only authorized applications can access the data, and that the data is encrypted in transit and at rest. Currently, the application uses a master key to connect. What should they implement to improve security?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable managed identity for the application and grant it access to Cosmos DB via Azure RBAC
Using managed identities for Azure resources eliminates the need for master keys by allowing the application to authenticate to Azure Cosmos DB via Azure AD. Option D is correct. Option A is incorrect because firewall restricts network access but does not address key management. Option B is incorrect because private endpoints improve network security but still require authentication. Option C is incorrect because resource tokens are for granular user-level access, not application authentication.
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.
✗
Use resource tokens with permissions for each user
Why it's wrong here
Resource tokens are for user-level access, not for application authentication.
✗
Enable private endpoint for Cosmos DB
Why it's wrong here
Enhances network security but still uses master keys for authentication.
✗
Configure IP firewall rules on the Cosmos DB account
Why it's wrong here
Restricts network access but does not remove the dependency on master keys.
✓
Enable managed identity for the application and grant it access to Cosmos DB via Azure RBAC
Why this is correct
Eliminates master keys and uses Azure AD authentication for secure access.
Related concept
Static NAT maps one inside address to one outside address.
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 AZ-500 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-500 NAT questions on configuration and troubleshooting.
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable managed identity for the application and grant it access to Cosmos DB via Azure RBAC — Using managed identities for Azure resources eliminates the need for master keys by allowing the application to authenticate to Azure Cosmos DB via Azure AD. Option D is correct. Option A is incorrect because firewall restricts network access but does not address key management. Option B is incorrect because private endpoints improve network security but still require authentication. Option C is incorrect because resource tokens are for granular user-level access, not application authentication.
What should I do if I get this AZ-500 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-500 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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