The correct answer is to define user-defined routes (UDRs) in each spoke that direct inter-spoke traffic to the Azure Firewall in the hub. This works because Azure Firewall is a managed, stateful service that can inspect all traffic passing through it, but it requires explicit routing to receive traffic from peered spokes; without UDRs, VNet peering allows direct communication between spokes, bypassing the firewall entirely. On the AZ-500 exam, this scenario tests your understanding of forced tunneling and traffic inspection in a hub-spoke topology—a common trap is assuming network security groups (NSGs) or VNet peering alone can inspect cross-VNet traffic, but NSGs only filter within a VNet and peering merely connects networks. To inspect inter-spoke traffic through Azure Firewall, you must override the default system route with a UDR pointing the spoke’s 0.0.0.0/0 or specific spoke address prefixes to the firewall’s private IP. Memory tip: think “UDR for inspection, peering for connection”—if you want the firewall to see it, you must route it.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 a hub-spoke network topology in Azure. The hub virtual network contains an Azure Firewall. Spoke virtual networks are peered to the hub. The security team wants to inspect all traffic between virtual machines in different spoke virtual networks. What is the minimum configuration required?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Define user-defined routes (UDRs) in each spoke that direct inter-spoke traffic to the Azure Firewall in the hub.
Option B is correct because Azure Firewall can route traffic through user-defined routes (UDRs) to inspect inter-spoke traffic. Option A is wrong because network security groups cannot inspect traffic between virtual networks. Option C is wrong because VNet peering does not provide traffic inspection. Option D is wrong because Azure VPNGateway is for site-to-site connectivity, not inspection.
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.
✗
Enable VNet peering gateway transit and allow forwarded traffic.
Why it's wrong here
This enables routing but not inspection.
✗
Deploy a VPN gateway in each spoke and configure site-to-site VPNs to the hub.
Why it's wrong here
This is unnecessary and complex for inter-spoke inspection.
✓
Define user-defined routes (UDRs) in each spoke that direct inter-spoke traffic to the Azure Firewall in the hub.
Why this is correct
UDRs force traffic through the firewall for inspection.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Configure network security groups (NSGs) on each spoke subnet.
Why it's wrong here
NSGs are stateless and cannot inspect traffic between virtual networks.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
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 — This question tests Secure networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Define user-defined routes (UDRs) in each spoke that direct inter-spoke traffic to the Azure Firewall in the hub. — Option B is correct because Azure Firewall can route traffic through user-defined routes (UDRs) to inspect inter-spoke traffic. Option A is wrong because network security groups cannot inspect traffic between virtual networks. Option C is wrong because VNet peering does not provide traffic inspection. Option D is wrong because Azure VPN Gateway is for site-to-site connectivity, not inspection.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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