The correct approach is to enable automatic key rotation on the Key Vault key and use the key's versionless identifier in Cosmos DB. This works because Cosmos DB’s customer-managed key encryption supports automatic detection of new key versions when you reference the key by its versionless URI, meaning the service seamlessly picks up the rotated key without any manual intervention or downtime. On the AZ-204 exam, this scenario tests your understanding of how Azure Cosmos DB integrates with Azure Key Vault for encryption at rest, and the common trap is assuming you must manually update the Cosmos DB account or regenerate keys—neither is required when using a versionless identifier. Remember the memory tip: “Versionless is effortless”—if you omit the version from the Key Vault key identifier, Cosmos DB handles rotation automatically.
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.
You are designing a solution for a healthcare application that stores patient data in Azure Cosmos DB. The data must be encrypted at rest using a customer-managed key stored in Azure Key Vault. You need to ensure that the key can be rotated without downtime. Which approach should you recommend?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable automatic key rotation on the Key Vault key and use the key's versionless identifier in Cosmos DB.
Cosmos DB supports customer-managed keys with key auto-rotation when using a Key Vault key version. By enabling automatic rotation and using the key vault key's versionless identifier, Cosmos DB will automatically use the new version when the key is rotated. Option B is correct. Option A is wrong because regenerating the key in Cosmos DB would require re-encryption. Option C is wrong because manual update is not needed. Option D is wrong because Azure Security Center is not involved.
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.
✗
Configure Azure Security Center to automatically rotate the key.
Why it's wrong here
Azure Security Center does not manage key rotation for Cosmos DB.
✗
After rotating the key in Key Vault, manually update the Cosmos DB account with the new key version.
Why it's wrong here
Manual update is not required and would cause downtime.
✗
Use the Cosmos DB account key rotation feature to regenerate the key.
Why it's wrong here
Regenerating the account key does not rotate the encryption key.
✓
Enable automatic key rotation on the Key Vault key and use the key's versionless identifier in Cosmos DB.
Why this is correct
Versionless identifier allows Cosmos DB to automatically use the latest key version.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 automatic key rotation on the Key Vault key and use the key's versionless identifier in Cosmos DB. — Cosmos DB supports customer-managed keys with key auto-rotation when using a Key Vault key version. By enabling automatic rotation and using the key vault key's versionless identifier, Cosmos DB will automatically use the new version when the key is rotated. Option B is correct. Option A is wrong because regenerating the key in Cosmos DB would require re-encryption. Option C is wrong because manual update is not needed. Option D is wrong because Azure Security Center is not involved.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Your organization has a custom application that stores customer data in Azure Cosmos DB. You need to encrypt the data at rest using a customer-managed key stored in Azure Key Vault. Which type of Cosmos DB encryption should you configure?
easy
A.Enable Azure Disk Encryption on the Cosmos DB instance
B.Enable Transparent Data Encryption (TDE)
✓ C.Use customer-managed keys (CMK) with Azure Key Vault
D.Implement client-side encryption using the SDK
Why C: Option A is correct because Cosmos DB supports encryption at rest with customer-managed keys (CMK) via Azure Key Vault. Option B is wrong because TDE is for SQL Server, not Cosmos DB. Option C is wrong because client-side encryption is separate. Option D is wrong because Azure Disk Encryption is for VMs.
Last reviewed: Jun 20, 2026
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