- A
Configure User-Defined Routes (UDRs) on each tier subnet to send inter-tier traffic through the Azure Firewall.
UDRs ensure traffic between tiers goes through the firewall for inspection, enabling the firewall to enforce rules.
- B
Place all VMs in the same subnet and rely on application-layer security.
Why wrong: Placing all tiers in the same subnet would defeat network segmentation.
- C
Disable the default route (0.0.0.0/0) on the app and data tiers.
Why wrong: Disabling the default route would break outbound internet access, but the tiers likely need no internet access; however, this is not necessary for intra-VNet segmentation.
- D
Configure Network Security Groups (NSGs) on each subnet to allow only the required inbound traffic.
NSGs provide a first layer of defense at the subnet/NIC level, restricting traffic to only necessary ports and sources.
- E
Configure Azure Firewall application rules to allow HTTP/HTTPS from web to app.
Why wrong: Application rules are for outbound internet traffic (FQDNs), not for inter-VNet traffic; network rules are needed.
Quick Answer
The answer is to configure User-Defined Routes (UDRs) on each tier subnet pointing to Azure Firewall as the next hop and to create Network Security Groups (NSGs) on each subnet allowing only the required inbound traffic. This combination is necessary because UDRs force all east-west traffic between the web, app, and data tiers through the Azure Firewall in the hub VNet, enabling inspection and segmentation, while NSGs provide a defense-in-depth layer by explicitly restricting inbound access at the subnet level—web from internet, app from web only, data from app only. On the AZ-500 exam, this scenario tests your understanding of forced tunneling and hub-spoke network design, with a common trap being to rely solely on NSGs without UDRs, which would allow direct tier-to-tier communication bypassing the firewall. A useful memory tip is “UDRs steer the traffic, NSGs screen the access”—both are required to enforce the principle of least privilege in a segmented architecture.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure 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.
You are designing network security for a multi-tier application with web, app, and data tiers. The web tier must be accessible from the internet, the app tier only from the web tier, and the data tier only from the app tier. You plan to use Azure Firewall in a hub VNet and peer the application VNet to the hub. Which TWO configurations are necessary to achieve this segmentation?
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
Configure User-Defined Routes (UDRs) on each tier subnet to send inter-tier traffic through the Azure Firewall.
To enforce east-west traffic inspection and segmentation, you need to route traffic between tiers through the Azure Firewall. This requires UDRs on each tier subnet pointing to the firewall as next hop for traffic to other tiers. Additionally, network rules in the firewall must explicitly allow the required flows (web to app, app to data) and deny others.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure User-Defined Routes (UDRs) on each tier subnet to send inter-tier traffic through the Azure Firewall.
- ✗
Place all VMs in the same subnet and rely on application-layer security.
Why it's wrong here
Placing all tiers in the same subnet would defeat network segmentation.
- ✗
Disable the default route (0.0.0.0/0) on the app and data tiers.
Why it's wrong here
Disabling the default route would break outbound internet access, but the tiers likely need no internet access; however, this is not necessary for intra-VNet segmentation.
- ✓
Configure Network Security Groups (NSGs) on each subnet to allow only the required inbound traffic.
Why this is correct
NSGs provide a first layer of defense at the subnet/NIC level, restricting traffic to only necessary ports and sources.
Related concept
CIDR notation defines the prefix length.
- ✗
Configure Azure Firewall application rules to allow HTTP/HTTPS from web to app.
Why it's wrong here
Application rules are for outbound internet traffic (FQDNs), not for inter-VNet traffic; network rules are needed.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
- →
Secure networking — study guide chapter
Learn the concepts, then practise the questions
- →
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Targeted practice on this topic area only
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AZ-500 practice test guide
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Configure User-Defined Routes (UDRs) on each tier subnet to send inter-tier traffic through the Azure Firewall. — To enforce east-west traffic inspection and segmentation, you need to route traffic between tiers through the Azure Firewall. This requires UDRs on each tier subnet pointing to the firewall as next hop for traffic to other tiers. Additionally, network rules in the firewall must explicitly allow the required flows (web to app, app to data) and deny others.
What should I do if I get this AZ-500 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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