- A
Place the backend NICs in an ASG named ASG-Backend.
ASG membership follows the NIC, so the rule still matches even when the VM IP changes.
- B
Create an NSG rule that allows TCP 8443 from ASG-Front to ASG-Backend.
This keeps the rule tied to workload roles instead of changing IP addresses, which is easier to maintain.
- C
Create a static route for the backend subnet to preserve the same IPs.
Why wrong: Routes do not make VM IP addresses static and do not solve the rebuild scenario.
- D
Use a service endpoint between the two subnets.
Why wrong: Service endpoints are for PaaS access, not for permitting subnet-to-subnet application traffic.
- E
Add a load balancer health probe rule on TCP 8443 only.
Why wrong: Health probes do not replace the need for an NSG rule that explicitly allows application traffic.
Quick Answer
The correct answer is to create an NSG rule that allows TCP 8443 from ASG-Front to ASG-Backend. This works because an Application Security Group (ASG) lets you group VM NICs logically, so when backend VMs are rebuilt and assigned new private IPs, the ASG membership persists and the NSG rule continues to apply without manual updates. This decouples security rules from dynamic IP addresses, solving the exact problem of IP churn in autoscaling or rebuild scenarios. On the AZ-104 exam, this tests your understanding of how ASGs abstract network security from IP dependencies—a common trap is trying to use static IPs or individual NSG rules per VM, which fail after rebuilds. Remember the mnemonic: ASG = Always Static Grouping, meaning the group stays fixed even as IPs change.
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.
Backend VMs are rebuilt often and get new private IP addresses. Frontend VMs must reach them only on TCP 8443, and the rule should keep working after rebuilds. Which two actions should the administrator take? Select two.
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
Place the backend NICs in an ASG named ASG-Backend.
Option A is correct because an Application Security Group (ASG) allows you to group backend VMs by their NICs, regardless of their private IP addresses. When backend VMs are rebuilt and receive new IPs, the ASG membership remains intact, so NSG rules referencing the ASG continue to work without manual updates. This decouples security rules from dynamic IP addresses.
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.
- ✓
Place the backend NICs in an ASG named ASG-Backend.
Why this is correct
ASG membership follows the NIC, so the rule still matches even when the VM IP changes.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create an NSG rule that allows TCP 8443 from ASG-Front to ASG-Backend.
Why this is correct
This keeps the rule tied to workload roles instead of changing IP addresses, which is easier to maintain.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a static route for the backend subnet to preserve the same IPs.
Why it's wrong here
Routes do not make VM IP addresses static and do not solve the rebuild scenario.
- ✗
Use a service endpoint between the two subnets.
Why it's wrong here
Service endpoints are for PaaS access, not for permitting subnet-to-subnet application traffic.
- ✗
Add a load balancer health probe rule on TCP 8443 only.
Why it's wrong here
Health probes do not replace the need for an NSG rule that explicitly allows application traffic.
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 (NSGs) or think that static routes or service endpoints can solve dynamic IP addressing, when in fact ASGs are the correct Azure feature for grouping VMs by function regardless of IP changes.
Trap categories for this question
Scenario analysis trap
Routes do not make VM IP addresses static and do not solve the rebuild scenario.
Detailed technical explanation
How to think about this question
Application Security Groups (ASGs) are evaluated at the NIC level and support up to 3000 IP configurations per ASG. When a VM is rebuilt, its new NIC can be added to the same ASG via Azure Resource Manager templates or automation scripts, ensuring NSG rules referencing the ASG remain valid. This is particularly useful in auto-scaling scenarios or CI/CD pipelines where VMs are ephemeral and IPs change frequently.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Place the backend NICs in an ASG named ASG-Backend. — Option A is correct because an Application Security Group (ASG) allows you to group backend VMs by their NICs, regardless of their private IP addresses. When backend VMs are rebuilt and receive new IPs, the ASG membership remains intact, so NSG rules referencing the ASG continue to work without manual updates. This decouples security rules from dynamic IP addresses.
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
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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