Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company has two Azure virtual networks: VNet-A and VNet-B. They peer the VNets and deploy a network virtual appliance (NVA) in VNet-A. They want to inspect all outbound traffic from VNet-B to the internet using the NVA. They configure a user-defined route (UDR) in a route table associated with the subnet in VNet-B, with a default route (0.0.0.0/0) and next hop set to the private IP of the NVA in VNet-A. However, outbound traffic from VNet-B still goes directly to the internet. 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
Best answer
The NVA's network interface must have 'IP forwarding' enabled.
IP forwarding allows the NVA to accept and forward traffic not destined to its own IP. Without it, the NVA drops the packets.
B
Distractor review
The VNet peering is not configured to allow traffic from VNet-B to route through VNet-A.
VNet peering allows traffic between VNets; no additional setting is needed to route through an NVA once UDRs and IP forwarding are in place.
C
Distractor review
The route table is not associated with the subnet in VNet-B.
The question states the route table is associated. If it were not, the traffic would indeed go direct, but the most likely cause given correct association is IP forwarding.
D
Distractor review
The NVA does not have a public IP address.
The NVA routes traffic using its private IP; a public IP is not required for this scenario.
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's network interface must have 'IP forwarding' enabled. — For an NVA to forward traffic in Azure, its network interface must have IP forwarding enabled. Without IP forwarding, the VM will drop traffic not addressed to itself. Even with correct UDRs, the NVA must be configured to forward traffic. The route table association and peering are correct, but the NVA itself must be set up to route 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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