- A
Add a network security group rule to the subnet that allows outbound TCP 443 to the storage account.
Why wrong: An NSG rule does not by itself restrict the storage account to one subnet or control access at the PaaS boundary.
- B
Enable a service endpoint for Microsoft.Storage on the subnet and add the subnet to the storage account firewall allow list.
This is the correct approach when the service must remain on the public endpoint but be accessible only from a specific subnet. The service endpoint lets Azure recognize the subnet as an allowed source while traffic still uses the storage account's public FQDN. Adding that subnet to the storage firewall enforces the restriction without requiring private endpoints or custom DNS management.
- C
Create a private endpoint and set the storage account to use a private DNS zone.
Why wrong: This would work technically, but it conflicts with the explicit requirement to avoid a private endpoint and custom DNS.
- D
Create a route table that sends storage traffic through an Azure Firewall appliance.
Why wrong: A route table can steer traffic, but it does not replace storage firewall authorization or subnet-based access control.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. 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 storage account must be reachable only from a single subnet. The team wants to keep the storage public endpoint in place, avoid a private endpoint, and avoid managing any custom DNS records. Which change best meets the requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 for Microsoft.Storage on the subnet and add the subnet to the storage account firewall allow list.
Option B is correct because enabling a service endpoint for Microsoft.Storage on the subnet injects the subnet's identity into the traffic to the storage account, allowing the storage account firewall to permit access only from that subnet while keeping the public endpoint active. This avoids the need for a private endpoint, custom DNS records, or additional routing appliances, directly meeting the requirement of restricting access to a single subnet.
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.
- ✗
Add a network security group rule to the subnet that allows outbound TCP 443 to the storage account.
Why it's wrong here
An NSG rule does not by itself restrict the storage account to one subnet or control access at the PaaS boundary.
- ✓
Enable a service endpoint for Microsoft.Storage on the subnet and add the subnet to the storage account firewall allow list.
Why this is correct
This is the correct approach when the service must remain on the public endpoint but be accessible only from a specific subnet. The service endpoint lets Azure recognize the subnet as an allowed source while traffic still uses the storage account's public FQDN. Adding that subnet to the storage firewall enforces the restriction without requiring private endpoints or custom DNS management.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a private endpoint and set the storage account to use a private DNS zone.
Why it's wrong here
This would work technically, but it conflicts with the explicit requirement to avoid a private endpoint and custom DNS.
- ✗
Create a route table that sends storage traffic through an Azure Firewall appliance.
Why it's wrong here
A route table can steer traffic, but it does not replace storage firewall authorization or subnet-based access control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network security groups (NSGs) with storage account firewalls, thinking an NSG rule on the subnet can restrict access to the storage account, when in fact the storage account firewall must explicitly allow the subnet via a service endpoint or virtual network rule to enforce subnet-level restriction.
Detailed technical explanation
How to think about this question
Service endpoints for Microsoft.Storage work by adding the subnet's virtual network identifier to the source IP of packets destined for the storage service, which the storage account firewall then uses to allow or deny access based on the configured virtual network rules. This mechanism does not require any changes to DNS or private IPs, and it leverages the existing public endpoint while enforcing network-level isolation. A real-world scenario is a multi-tier application where only the application subnet should access a storage account for blob data, and using service endpoints avoids the complexity and cost of private endpoints.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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: Enable a service endpoint for Microsoft.Storage on the subnet and add the subnet to the storage account firewall allow list. — Option B is correct because enabling a service endpoint for Microsoft.Storage on the subnet injects the subnet's identity into the traffic to the storage account, allowing the storage account firewall to permit access only from that subnet while keeping the public endpoint active. This avoids the need for a private endpoint, custom DNS records, or additional routing appliances, directly meeting the requirement of restricting access to a single subnet.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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