Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
Your company has two Azure virtual networks: VNet-A (10.0.0.0/16) and VNet-B (10.1.0.0/16). They are connected via VNet peering. You deploy a network virtual appliance (NVA) in a subnet in VNet-A to inspect all traffic between the VNets. You configure a user-defined route (UDR) on the subnet in VNet-B that points the address space of VNet-A (10.0.0.0/16) to the next hop as the private IP of the NVA. However, traffic from VNet-B to VNet-A still bypasses the NVA and takes the direct peered path. 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 UDR is not applied to the subnet in VNet-B
The question states the UDR is configured on the subnet, so this is not the cause.
B
Best answer
IP forwarding is not enabled on the NVA's network interface
IP forwarding must be enabled on the NIC of the NVA to allow it to forward traffic not addressed to itself. This is a common oversight.
C
Distractor review
VNet peering does not support user-defined routes
VNet peering works with UDRs; system routes can be overridden by UDRs on the subnet.
D
Distractor review
The NVA must be in the same virtual network as the spoke
The NVA can be in a different VNet (hub) as long as there is peering and UDRs pointing to it.
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.
More questions from this exam
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: IP forwarding is not enabled on the NVA's network interface — A common misconfiguration is that the NVA's network interface lacks IP forwarding. Without IP forwarding, the NVA drops traffic destined to other IP addresses. The UDR is configured correctly, but the NVA cannot forward the packets.
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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