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.
Your organization has multiple Azure subscriptions connected via a hub-spoke topology using Azure Firewall in the hub. You need to ensure that traffic between spoke VNets is routed through the firewall for inspection. You configure user-defined routes (UDRs) on the spoke subnets. However, traffic between spokes is still bypassing the firewall. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'Use remote gateway' setting is disabled on the spoke VNet peering.
Option D is correct because for VNet peering, the 'Use remote gateway' setting on the spoke peering must be enabled to route traffic through the hub firewall. Without this, peered traffic may bypass the firewall. Option A is wrong because Azure Firewall can handle traffic between spokes. Option B is wrong because 'Allow gateway transit' is needed on the hub side. Option C is wrong because the firewall subnet does not need a UDR for spoke-to-spoke traffic; the spokes' UDRs point to the firewall's private IP.
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.
✗
Azure Firewall does not support traffic between spoke VNets.
Why it's wrong here
Azure Firewall supports transit traffic between spokes.
✗
The UDR on the firewall subnet does not include the spoke address spaces.
Why it's wrong here
UDR on firewall subnet is not required for spoke-to-spoke; firewall handles routing.
✗
The 'Allow gateway transit' setting is disabled on the spoke peering.
Why it's wrong here
'Allow gateway transit' is configured on the hub peering, not spoke.
✓
The 'Use remote gateway' setting is disabled on the spoke VNet peering.
Why this is correct
Spoke VNets must use remote gateway to route traffic through the hub firewall.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: The 'Use remote gateway' setting is disabled on the spoke VNet peering. — Option D is correct because for VNet peering, the 'Use remote gateway' setting on the spoke peering must be enabled to route traffic through the hub firewall. Without this, peered traffic may bypass the firewall. Option A is wrong because Azure Firewall can handle traffic between spokes. Option B is wrong because 'Allow gateway transit' is needed on the hub side. Option C is wrong because the firewall subnet does not need a UDR for spoke-to-spoke traffic; the spokes' UDRs point to the firewall's private IP.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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