Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is designing a hub-spoke network topology with Azure Firewall in the hub virtual network. Spoke virtual networks are peered to the hub. They want to ensure that all outbound internet traffic from virtual machines in a spoke subnet goes through the Azure Firewall. They have configured a route table on the spoke subnet with a default route (0.0.0.0/0) pointing to the Azure Firewall's private IP address as the next hop. However, traffic is still bypassing the firewall. What is the most likely cause?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
The Azure Firewall is in a different region than the spoke VNet.
Azure Firewall can be in a different region as long as VNet peering exists between the hub and spoke. Regional differences do not prevent routing; peering supports cross-region connectivity.
B
Best answer
The route table is not associated to the spoke subnet.
A route table must be explicitly associated to a subnet for its routes to be effective. Without association, the default system routes are used, and traffic bypasses the firewall.
C
Distractor review
The Azure Firewall does not have the correct network and application rules configured.
Even if rules are missing, traffic would attempt to route through the firewall but be dropped, not bypass it. The question is about traffic bypassing the firewall entirely, which indicates a routing issue, not a rule issue.
D
Distractor review
The spoke VNet has the 'Use remote virtual network gateways' setting disabled.
This setting is required for gateway transit scenarios (e.g., VPN gateway), not for Azure Firewall. For Azure Firewall, the spoke routes directly to the firewall's private IP via peering; no gateway setting is needed.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related AZ-500 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this AZ-500 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: The route table is not associated to the spoke subnet. — A route table must be explicitly associated to a subnet for its routes to be effective. Without association, the default system routes are used, and traffic bypasses the firewall. Other options such as incorrect firewall rules, regional differences, or VPN gateway transit settings are not the primary cause in this scenario.
What should I do if I get this AZ-500 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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