Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company has two Azure virtual networks, VNet-A (hub) and VNet-B (spoke), connected via VNet peering. They deploy a network virtual appliance (NVA) in a subnet in VNet-A to inspect all traffic between the VNets. They configure a user-defined route (UDR) on the subnet in VNet-B with the destination address space of VNet-A (10.0.0.0/16) and the next hop set to the private IP of the NVA. However, traffic from VNet-B to VNet-A still bypasses the NVA and takes a direct 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 NVA's private IP address is not reachable from VNet-B
If the NVA were unreachable, traffic would fail, but the question states traffic still flows directly, not that it fails.
B
Distractor review
VNet peering system routes override user-defined routes
UDRs take precedence over system routes for the specified destination prefix. Peering system routes are overridden by UDRs.
C
Distractor review
The UDR must be applied to the gateway subnet of VNet-B
The UDR should be applied to the subnet where the source VMs are located, not the gateway subnet. The configuration described is correct in terms of subnet selection.
D
Best answer
The NVA network interface does not have IP forwarding enabled
IP forwarding must be enabled on the NVA's NIC for it to forward traffic destined to other IPs. Without it, the NVA will drop the traffic, and the peering path remains active.
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: The NVA network interface does not have IP forwarding enabled — For a UDR that directs traffic to an NVA to be effective, the NVA's network interface must have IP forwarding enabled. Without IP forwarding, the NVA will drop traffic that is not destined to its own IP address, and the traffic will not be forwarded. System routes for VNet peering do not take precedence over UDRs if the UDR is more specific, but in this case the UDR is specific to VNet-A's prefix. However, if IP forwarding is not enabled, the NVA cannot forward the traffic even if the route is present. The other options are not the primary cause: the NVA is likely reachable, the UDR is on the correct subnet, and peerings do not override UDRs.
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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