The answer is an Application Security Group (ASG). This is correct because an ASG allows you to logically group Azure virtual machines by their application roles—such as web servers—and then reference that group as the source in a single network security group (NSG) rule. Since the web servers are deployed in an Availability Set, you assign the same ASG to their NICs, and the NSG rule dynamically includes all current and future VMs in that ASG, eliminating the need to manage individual IP addresses. On the AZ-500 exam, this scenario tests your understanding of how ASGs simplify NSG rule management by abstracting IP-based source restrictions into role-based groupings. A common trap is confusing ASGs with NSGs themselves or assuming you must use IP ranges or service tags; remember that ASGs are for your own application tiers, not Azure services. Memory tip: think “ASG = App Role Group” to recall it groups VMs by function, not by network address.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure 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 company has two application tiers: web servers and application servers. They want to allow traffic from the web servers to the application servers on port 8080, but only for a specific set of web servers. They have deployed the web servers in an Availability Set and want to use a single NSG rule to allow traffic from any web server that is part of that application tier. Which component should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Application security group
An Application Security Group (ASG) allows you to group virtual machines logically by their application roles (e.g., web servers) and then use that ASG as the source in a single NSG rule. Since the web servers are in an Availability Set, you can assign the same ASG to their NICs, and the NSG rule will dynamically include all current and future VMs in that ASG. This meets the requirement to allow traffic from any web server in that tier to the application servers on port 8080 without maintaining individual 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.
✓
Application security group
Why this is correct
Correct. An ASG can be used as the source in an NSG rule to represent a group of VMs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Service tag
Why it's wrong here
Incorrect. Service tags represent groups of Azure service IP addresses, not custom groups of VMs.
✗
Source IP address range
Why it's wrong here
Incorrect. Using specific IP ranges would require listing all web server IPs and would not scale well.
✗
Virtual network peering
Why it's wrong here
Incorrect. VNet peering connects virtual networks but does not group VMs for NSG rules.
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 mistakenly think Service Tags can be used to group custom sets of VMs, when in fact Service Tags are only for Azure services or broad network scopes.
Detailed technical explanation
How to think about this question
Under the hood, an Application Security Group is a named object referenced in NSG rules as a source or destination, and Azure's network fabric resolves it to the actual NICs that have the ASG assigned. This allows for dynamic membership—when you add a new web server VM to the Availability Set and assign the ASG to its NIC, the NSG rule automatically applies without any rule modification. In a real-world scenario, this is critical for auto-scaling environments where web server instances are created and destroyed frequently, as it eliminates the need to update NSG rules with new IP addresses.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Application security group — An Application Security Group (ASG) allows you to group virtual machines logically by their application roles (e.g., web servers) and then use that ASG as the source in a single NSG rule. Since the web servers are in an Availability Set, you can assign the same ASG to their NICs, and the NSG rule will dynamically include all current and future VMs in that ASG. This meets the requirement to allow traffic from any web server in that tier to the application servers on port 8080 without maintaining individual IP addresses.
What should I do if I get this AZ-500 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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Question Discussion
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