- A
Application Security Groups for the frontend and backend tiers.
Application Security Groups let you reference groups of VMs in NSG rules instead of individual IP addresses. That is ideal when backend IPs change often because the rule continues to target the backend application tier rather than a specific address. The administrator can place the frontend VMs in one ASG and the backend VMs in another, then allow TCP 8443 between those groups without constantly editing the NSG.
- B
A service endpoint on the backend subnet.
Why wrong: Service endpoints are for securing access to supported PaaS services, not for grouping VMs in NSG rules.
- C
A route table with a next hop of Virtual network gateway.
Why wrong: Route tables control forwarding, but they do not simplify security rules for changing VM IP addresses.
- D
A private endpoint for each backend VM.
Why wrong: Private endpoints are used for private access to supported services, not for direct VM-to-VM tier grouping.
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. A key principle to apply: aSGs allow grouping VMs by application tier for NSG rules.. 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.
Frontend VMs in one subnet must reach backend VMs on TCP 8443. The backend VMs are rebuilt frequently, so their private IP addresses change often. The administrator wants to avoid updating NSG rules every time the backend IPs change. What should be used in the NSG rule?
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
Application Security Groups for the frontend and backend tiers.
Application Security Groups (ASGs) allow you to group VMs logically by function (e.g., frontend, backend) and reference those groups in NSG rules. Since the backend VMs are rebuilt frequently and their private IPs change, using ASGs in the NSG rule (source = frontend ASG, destination = backend ASG, port = 8443) eliminates the need to update IP addresses manually. The NSG rule remains valid as long as the VMs are assigned to the correct ASG, regardless of IP changes.
Key principle: ASGs allow grouping VMs by application tier for NSG rules.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Application Security Groups for the frontend and backend tiers.
Why this is correct
Application Security Groups let you reference groups of VMs in NSG rules instead of individual IP addresses. That is ideal when backend IPs change often because the rule continues to target the backend application tier rather than a specific address. The administrator can place the frontend VMs in one ASG and the backend VMs in another, then allow TCP 8443 between those groups without constantly editing the NSG.
Related concept
ASGs allow grouping VMs by application tier for NSG rules.
- ✗
A service endpoint on the backend subnet.
Why it's wrong here
Service endpoints are for securing access to supported PaaS services, not for grouping VMs in NSG rules.
When this WOULD be correct
When you need to restrict access from a subnet to a specific Azure service (e.g., Azure Storage or SQL Database) over the Azure backbone network, ensuring traffic never leaves the Microsoft network.
- ✗
A route table with a next hop of Virtual network gateway.
Why it's wrong here
Route tables control forwarding, but they do not simplify security rules for changing VM IP addresses.
When this WOULD be correct
In a scenario where you need to force traffic from a subnet to go through a network virtual appliance (NVA) or VPN gateway for inspection or hybrid connectivity, a route table with a next hop of Virtual network gateway would be correct. For example, to route all outbound traffic from a subnet through an on-premises firewall via a site-to-site VPN.
- ✗
A private endpoint for each backend VM.
Why it's wrong here
Private endpoints are used for private access to supported services, not for direct VM-to-VM tier grouping.
When this WOULD be correct
A question where backend VMs need to securely access an Azure PaaS service (e.g., Azure SQL Database or Storage Account) without using public endpoints, and the PaaS service's IP addresses are not relevant because the connection is over a private IP.
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.
✓Application Security Groups for the frontend and backend tiers.Correct answer▾
Why this is correct
Application Security Groups let you reference groups of VMs in NSG rules instead of individual IP addresses. That is ideal when backend IPs change often because the rule continues to target the backend application tier rather than a specific address. The administrator can place the frontend VMs in one ASG and the backend VMs in another, then allow TCP 8443 between those groups without constantly editing the NSG.
✗A service endpoint on the backend subnet.Wrong answer — click to see why▾
Why this is wrong here
A service endpoint secures Azure service traffic (e.g., to Azure Storage) to a subnet, not TCP traffic between VMs. It does not allow dynamic IP-based rules for backend VMs.
★ When this WOULD be the correct answer
When you need to restrict access from a subnet to a specific Azure service (e.g., Azure Storage or SQL Database) over the Azure backbone network, ensuring traffic never leaves the Microsoft network.
Why candidates choose this
Candidates may confuse service endpoints with a method to secure intra-VNet traffic, not realizing they are designed for Azure PaaS services, not VM-to-VM communication.
✗A route table with a next hop of Virtual network gateway.Wrong answer — click to see why▾
Why this is wrong here
Route tables control traffic routing, not security filtering. A route table with a next hop of Virtual network gateway would redirect traffic to a VPN gateway, which does not solve the need to allow TCP 8443 traffic to dynamically changing backend IPs without updating NSG rules.
★ When this WOULD be the correct answer
In a scenario where you need to force traffic from a subnet to go through a network virtual appliance (NVA) or VPN gateway for inspection or hybrid connectivity, a route table with a next hop of Virtual network gateway would be correct. For example, to route all outbound traffic from a subnet through an on-premises firewall via a site-to-site VPN.
Why candidates choose this
Candidates may confuse routing with security, thinking that directing traffic through a gateway can implicitly control access, or they may believe that a route table can replace NSG rules for traffic filtering.
✗A private endpoint for each backend VM.Wrong answer — click to see why▾
Why this is wrong here
Private endpoints are used to securely access Azure PaaS services over a private IP address, not to allow VMs in one subnet to communicate with VMs in another subnet within the same VNet. They do not solve the problem of dynamic private IP addresses for backend VMs.
★ When this WOULD be the correct answer
A question where backend VMs need to securely access an Azure PaaS service (e.g., Azure SQL Database or Storage Account) without using public endpoints, and the PaaS service's IP addresses are not relevant because the connection is over a private IP.
Why candidates choose this
Candidates may confuse private endpoints with a method to assign static private IPs to VMs, or think that private endpoints can be used for VM-to-VM communication within a VNet.
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 Application Security Groups with Network Security Groups themselves, or think that service endpoints or private endpoints are designed for VM-to-VM communication, when in fact they are for securing access to Azure PaaS services.
Detailed technical explanation
How to think about this question
Under the hood, ASGs are evaluated as part of the NSG's effective security rules; when a VM is added to an ASG, the NSG automatically translates the ASG reference to the VM's current private IPs at runtime. This is especially useful in auto-scaling scenarios or blue/green deployments where VMs are frequently replaced. A common real-world use case is a web farm where frontend VMs must communicate with a dynamic backend pool; ASGs keep NSG rules static while the underlying IPs change.
KKey Concepts to Remember
- ASGs allow grouping VMs by application tier for NSG rules.
- NSG rules can reference ASGs as source or destination.
- VMs can belong to multiple Application Security Groups.
- ASGs eliminate the need to update NSG rules for changing VM IP addresses.
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
ASGs allow grouping VMs by application tier for NSG rules.
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
Got this wrong? Here's your next step.
Review aSGs allow grouping VMs by application tier for NSG rules., then practise related AZ-104 questions on the same topic to reinforce the concept.
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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 — ASGs allow grouping VMs by application tier for NSG rules..
What is the correct answer to this question?
The correct answer is: Application Security Groups for the frontend and backend tiers. — Application Security Groups (ASGs) allow you to group VMs logically by function (e.g., frontend, backend) and reference those groups in NSG rules. Since the backend VMs are rebuilt frequently and their private IPs change, using ASGs in the NSG rule (source = frontend ASG, destination = backend ASG, port = 8443) eliminates the need to update IP addresses manually. The NSG rule remains valid as long as the VMs are assigned to the correct ASG, regardless of IP changes.
What should I do if I get this AZ-104 question wrong?
Review aSGs allow grouping VMs by application tier for NSG rules., then practise related AZ-104 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
ASGs allow grouping VMs by application tier for NSG rules.
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Last reviewed: Jun 11, 2026
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