The correct actions are to enable 'Secure transfer required' on the storage account and configure the storage account firewall to allow access only from the function's virtual network. Enabling secure transfer forces all client-to-service communication to use HTTPS, which encrypts data in transit, while the firewall restriction ensures that only traffic originating from your function’s virtual network (via a service endpoint or private endpoint) can reach the storage account. On the AZ-204 exam, this scenario tests your understanding that customer-managed keys (CMK) apply only to data at rest, not in transit—a common trap where candidates mistakenly select Key Vault CMK options. The search intent for secure data transit between Azure Functions and storage is addressed by combining network-level isolation with protocol enforcement. Remember the mnemonic: "HTTPS locks the pipe, VNet locks the door"—secure transfer encrypts the communication channel, and the firewall restricts the entry point to your trusted network.
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. 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 developing a serverless application using Azure Functions that processes sensitive data. The function is triggered by an Azure Storage queue. You need to ensure that data in transit between the function and the storage account is encrypted using a customer-managed key (CMK) and that the storage account's firewall only allows access from the function's virtual network. Which two actions should you take? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the storage account firewall to allow access only from the function's virtual network.
To enforce CMK for data in transit, you need to use HTTPS and also require secure transfer. However, CMK for data in transit is not supported; CMK is for data at rest. The question asks for data in transit encryption using CMK, but that is not a standard feature. The best interpretation is to ensure encryption in transit (HTTPS) and restrict network access. Option A is correct: enable 'Secure transfer required' on the storage account to enforce HTTPS. Option C is correct: configure the storage account firewall to allow access only from the function's virtual network (via service endpoint or private endpoint). Option B is wrong because configuring CMK in Key Vault does not encrypt data in transit. Option D is wrong because VNet integration for the function app does not directly restrict storage access.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 a customer-managed key in Azure Key Vault and associate it with the storage account.
Read the scenario before looking for a memorised answer.
✗
Enable VNet integration on the function app to route traffic through a virtual network.
Why it's wrong here
VNet integration does not automatically restrict storage access; you need to configure the storage firewall.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Implement Azure security — This question tests Implement Azure security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the storage account firewall to allow access only from the function's virtual network. — To enforce CMK for data in transit, you need to use HTTPS and also require secure transfer. However, CMK for data in transit is not supported; CMK is for data at rest. The question asks for data in transit encryption using CMK, but that is not a standard feature. The best interpretation is to ensure encryption in transit (HTTPS) and restrict network access. Option A is correct: enable 'Secure transfer required' on the storage account to enforce HTTPS. Option C is correct: configure the storage account firewall to allow access only from the function's virtual network (via service endpoint or private endpoint). Option B is wrong because configuring CMK in Key Vault does not encrypt data in transit. Option D is wrong because VNet integration for the function app does not directly restrict storage access.
What should I do if I get this AZ-204 question wrong?
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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