- A
A private endpoint for the storage account
Why wrong: A private endpoint creates a private IP and usually requires private DNS configuration.
- B
A service endpoint on the subnet and a storage firewall rule for that subnet
A service endpoint keeps the public endpoint in place while extending the subnet's identity to the storage service. Combined with a storage firewall rule that allows only that subnet, it restricts access without assigning a private IP or requiring private DNS management. This exactly matches the stated design goals.
- C
An NSG rule that allows TCP 443 to the storage account
Why wrong: An NSG cannot grant access to a PaaS storage account by itself, because storage authorization is handled separately.
- D
An application security group tied to the storage account
Why wrong: Application security groups are for grouping virtual machines, not for controlling storage account network access.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. 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 storage account must be reachable only from workloads in one Azure subnet. The team wants to keep using the storage account's public FQDN, avoid creating a private IP address in the virtual network, and avoid managing private DNS zones. What should the administrator configure?
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
A service endpoint on the subnet and a storage firewall rule for that subnet
A service endpoint on the subnet and a storage firewall rule for that subnet is correct because it allows the storage account to be reachable only from workloads in one Azure subnet while still using the storage account's public FQDN. Service endpoints extend the virtual network identity to the storage account over the Microsoft backbone, and the firewall rule restricts access to that specific subnet. This avoids creating a private IP address in the virtual network and eliminates the need to manage private DNS zones, as the public endpoint is retained.
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.
- ✗
A private endpoint for the storage account
Why it's wrong here
A private endpoint creates a private IP and usually requires private DNS configuration.
When this WOULD be correct
When the requirement is to access the storage account privately from a VNet without using its public endpoint, and the team is willing to manage private DNS zones or use Azure Private DNS.
- ✓
A service endpoint on the subnet and a storage firewall rule for that subnet
Why this is correct
A service endpoint keeps the public endpoint in place while extending the subnet's identity to the storage service. Combined with a storage firewall rule that allows only that subnet, it restricts access without assigning a private IP or requiring private DNS management. This exactly matches the stated design goals.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An NSG rule that allows TCP 443 to the storage account
Why it's wrong here
An NSG cannot grant access to a PaaS storage account by itself, because storage authorization is handled separately.
When this WOULD be correct
An NSG rule allowing TCP 443 to the storage account would be correct if the goal is to permit outbound traffic from a subnet to the storage account's public endpoint, while other outbound traffic is denied. For example, in a scenario where the storage account is publicly accessible but you need to control which VMs can initiate connections to it, an NSG rule on the subnet would suffice.
- ✗
An application security group tied to the storage account
Why it's wrong here
Application security groups are for grouping virtual machines, not for controlling storage account network access.
When this WOULD be correct
An administrator needs to allow outbound traffic from a specific set of VMs (grouped in an ASG) to the internet while denying all other outbound traffic. The ASG is referenced in an NSG rule to permit traffic only from those VMs.
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.
✓A service endpoint on the subnet and a storage firewall rule for that subnetCorrect answer▾
Why this is correct
A service endpoint keeps the public endpoint in place while extending the subnet's identity to the storage service. Combined with a storage firewall rule that allows only that subnet, it restricts access without assigning a private IP or requiring private DNS management. This exactly matches the stated design goals.
✗A private endpoint for the storage accountWrong answer — click to see why▾
Why this is wrong here
A private endpoint creates a private IP in the VNet and requires managing private DNS zones, which contradicts the requirement to avoid both.
★ When this WOULD be the correct answer
When the requirement is to access the storage account privately from a VNet without using its public endpoint, and the team is willing to manage private DNS zones or use Azure Private DNS.
Why candidates choose this
Candidates may confuse private endpoints with service endpoints, thinking both provide private connectivity, but private endpoints involve more management overhead.
✗An NSG rule that allows TCP 443 to the storage accountWrong answer — click to see why▾
Why this is wrong here
NSG rules control traffic at the subnet or NIC level within a virtual network, but they cannot filter traffic to a storage account's public endpoint from outside the subnet. The question requires restricting access to only one subnet, and NSGs alone cannot enforce that the storage account rejects traffic from other sources.
★ When this WOULD be the correct answer
An NSG rule allowing TCP 443 to the storage account would be correct if the goal is to permit outbound traffic from a subnet to the storage account's public endpoint, while other outbound traffic is denied. For example, in a scenario where the storage account is publicly accessible but you need to control which VMs can initiate connections to it, an NSG rule on the subnet would suffice.
Why candidates choose this
Candidates often confuse network security groups with service-level access controls, assuming that an NSG rule can restrict access to a specific Azure service endpoint. They may also think that allowing HTTPS (TCP 443) is sufficient to secure access, overlooking that NSGs do not authenticate or authorize the destination resource.
✗An application security group tied to the storage accountWrong answer — click to see why▾
Why this is wrong here
An application security group (ASG) is used to group virtual machines and apply NSG rules based on those groups, not to control access to a storage account. It cannot restrict storage account access to a specific subnet without a private endpoint or service endpoint.
★ When this WOULD be the correct answer
An administrator needs to allow outbound traffic from a specific set of VMs (grouped in an ASG) to the internet while denying all other outbound traffic. The ASG is referenced in an NSG rule to permit traffic only from those VMs.
Why candidates choose this
Candidates may confuse ASGs with network security controls for PaaS services, thinking they can be used to restrict access to storage accounts similarly to how they control VM-to-VM 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, assuming that only private endpoints can restrict access to a single subnet, but service endpoints combined with a storage firewall rule achieve the same goal without private IPs or DNS management.
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, bypassing the public internet, and the storage firewall rule with the subnet's virtual network ID ensures only traffic from that subnet is accepted. Under the hood, the service endpoint adds a route to the subnet's route table with a next hop type of 'VirtualNetworkServiceEndpoint', and the storage firewall uses the subnet's resource ID for filtering. In a real-world scenario, this is ideal for workloads like Azure VMs that need to access storage without the complexity of private endpoints, but note that service endpoints do not provide private IP connectivity and traffic still traverses the Microsoft backbone using the public endpoint.
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 Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A service endpoint on the subnet and a storage firewall rule for that subnet — A service endpoint on the subnet and a storage firewall rule for that subnet is correct because it allows the storage account to be reachable only from workloads in one Azure subnet while still using the storage account's public FQDN. Service endpoints extend the virtual network identity to the storage account over the Microsoft backbone, and the firewall rule restricts access to that specific subnet. This avoids creating a private IP address in the virtual network and eliminates the need to manage private DNS zones, as the public endpoint is retained.
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.
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Last reviewed: Jun 11, 2026
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