- A
Create a private endpoint and disable public network access on the storage account.
Why wrong: This changes the access model to private IP access instead of keeping the public endpoint available.
- B
Enable a service endpoint on the subnet and add a virtual network rule for that subnet on the storage account firewall.
A service endpoint lets resources in the subnet access the storage account through the service's public endpoint while presenting the subnet's Azure identity to the firewall. By adding a virtual network rule for that subnet, the storage account allows traffic from that subnet and blocks traffic from others. This satisfies the requirement to keep the public endpoint and restrict access to a single subnet.
- C
Place the subnet behind a NAT gateway and use a shared public IP.
Why wrong: A NAT gateway controls outbound internet translation, not authorization to a storage account.
- D
Add a VPN gateway and route storage traffic through the branch office.
Why wrong: A VPN gateway is for hybrid connectivity and does not by itself restrict storage access to one subnet.
AZ-104 Implement and Manage Storage Practice Question
This AZ-104 practice question tests your understanding of implement and manage storage. 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.
A team has Windows VMs in a subnet that need to access an Azure Storage account. The storage account should remain reachable through its public endpoint, but only traffic from that one subnet should be allowed. Which configuration best meets the requirement?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable a service endpoint on the subnet and add a virtual network rule for that subnet on the storage account firewall.
Option B is correct because a service endpoint extends the virtual network private address space to the storage account, allowing traffic from the specified subnet to reach the storage account via the Azure backbone while keeping the public endpoint accessible. By adding a virtual network rule on the storage account firewall, you restrict access to only traffic originating from that subnet, meeting the requirement of allowing only that subnet through the public endpoint.
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.
- ✗
Create a private endpoint and disable public network access on the storage account.
Why it's wrong here
This changes the access model to private IP access instead of keeping the public endpoint available.
When this WOULD be correct
When the requirement is to completely isolate the storage account from the public internet and allow access only from a specific virtual network, such as for a highly sensitive application that must not be exposed to any public endpoint.
- ✓
Enable a service endpoint on the subnet and add a virtual network rule for that subnet on the storage account firewall.
Why this is correct
A service endpoint lets resources in the subnet access the storage account through the service's public endpoint while presenting the subnet's Azure identity to the firewall. By adding a virtual network rule for that subnet, the storage account allows traffic from that subnet and blocks traffic from others. This satisfies the requirement to keep the public endpoint and restrict access to a single subnet.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Place the subnet behind a NAT gateway and use a shared public IP.
- ✗
Add a VPN gateway and route storage traffic through the branch office.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable a service endpoint on the subnet and add a virtual network rule for that subnet on the storage account firewall.Correct answer▾
Why this is correct
A service endpoint lets resources in the subnet access the storage account through the service's public endpoint while presenting the subnet's Azure identity to the firewall. By adding a virtual network rule for that subnet, the storage account allows traffic from that subnet and blocks traffic from others. This satisfies the requirement to keep the public endpoint and restrict access to a single subnet.
✗Create a private endpoint and disable public network access on the storage account.Wrong answer — click to see why▾
Why this is wrong here
The requirement states the storage account must remain reachable through its public endpoint, but option A disables public network access, which violates that condition.
★ When this WOULD be the correct answer
When the requirement is to completely isolate the storage account from the public internet and allow access only from a specific virtual network, such as for a highly sensitive application that must not be exposed to any public endpoint.
Why candidates choose this
Candidates may think that private endpoints are the standard for secure access and overlook the explicit requirement to keep the public endpoint enabled.
✗Place the subnet behind a NAT gateway and use a shared public IP.Wrong answer — click to see why▾
Why this is wrong here
A NAT gateway provides outbound internet access but does not restrict inbound access to the storage account to a specific subnet; it only changes the source IP for outbound traffic, so the storage account firewall cannot filter by subnet.
★ When this WOULD be the correct answer
If the requirement were to allow VMs in a subnet to access the internet (e.g., for updates) while hiding their private IPs behind a single public IP, a NAT gateway would be the correct solution.
Why candidates choose this
Candidates may confuse NAT gateway with service endpoints, thinking that a shared public IP can be used in a storage firewall rule to restrict access, but storage firewalls cannot filter by NAT gateway public IPs.
✗Add a VPN gateway and route storage traffic through the branch office.Wrong answer — click to see why▾
Why this is wrong here
A VPN gateway routes traffic over an encrypted tunnel to a branch office, not directly to Azure Storage. It does not restrict storage access to a specific subnet's traffic; instead, it adds unnecessary complexity and latency.
★ When this WOULD be the correct answer
A question requiring secure, encrypted connectivity from an on-premises network to Azure resources, such as 'A company needs to connect its branch office to Azure VMs over the internet with encrypted traffic.' In that case, a VPN gateway would be correct.
Why candidates choose this
Candidates may think a VPN gateway provides a secure, private connection to Azure Storage, confusing site-to-site VPN with subnet-level access control, and overlook that the requirement is about restricting access from a specific subnet, not encrypting traffic.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse service endpoints with private endpoints, thinking that a private endpoint is required to restrict access to a specific subnet, but service endpoints with firewall rules achieve the same goal while keeping the public endpoint accessible.
Detailed technical explanation
How to think about this question
Service endpoints use the Azure backbone to route traffic from the subnet to the storage account, ensuring the source IP seen by the storage account is the subnet's private IP, not a public IP. The virtual network rule on the storage account firewall checks the source virtual network and subnet ID, not the IP address, so it works even if the subnet uses private IPs that are not routable over the internet. In a real-world scenario, this is ideal for scenarios like allowing a specific application tier to access a storage account while keeping the public endpoint available for other services that might need it from other networks.
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.
TExam Day Tips
- 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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Storage — This question tests Implement and Manage Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable a service endpoint on the subnet and add a virtual network rule for that subnet on the storage account firewall. — Option B is correct because a service endpoint extends the virtual network private address space to the storage account, allowing traffic from the specified subnet to reach the storage account via the Azure backbone while keeping the public endpoint accessible. By adding a virtual network rule on the storage account firewall, you restrict access to only traffic originating from that subnet, meeting the requirement of allowing only that subnet through the public endpoint.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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