- A
Increase the priority of the NSG rules on the subnet.
Why wrong: NSGs filter traffic but do not decide the next hop for internet-bound packets.
- B
Remove the default UDR to the appliance and leave only the private-prefix routes in place.
The 0.0.0.0/0 UDR is forcing all outbound traffic to the appliance, which prevents the NAT gateway from handling internet destinations. Removing that default route lets Azure use the system internet route, where the NAT gateway can provide outbound SNAT. Specific routes for private prefixes can remain and continue to send internal traffic to the appliance.
- C
Associate the NAT gateway with the virtual network instead of the subnet.
Why wrong: NAT gateway association is done at subnet scope, so moving it to the VNet is not a valid configuration change.
- D
Enable service endpoints on the subnet to bypass the appliance.
Why wrong: Service endpoints are for Azure service access and do not change internet routing or NAT behavior.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A subnet is connected to a NAT gateway, but outbound connections to a public software update site are still leaving through a network virtual appliance. The route table contains a 0.0.0.0/0 user-defined route to the appliance, and the business wants the NAT gateway to handle internet traffic while preserving private routes to the appliance. What is the best fix?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Remove the default UDR to the appliance and leave only the private-prefix routes in place.
The 0.0.0.0/0 user-defined route (UDR) to the network virtual appliance (NVA) has a higher priority than the NAT gateway's default route, so all internet-bound traffic is forced through the appliance. Removing that UDR while keeping private-prefix routes (e.g., 10.0.0.0/8) ensures that only private traffic uses the appliance, and internet traffic follows the NAT gateway's default route. This satisfies the business requirement of using the NAT gateway for internet traffic while preserving private routes through the NVA.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the priority of the NSG rules on the subnet.
Why it's wrong here
NSGs filter traffic but do not decide the next hop for internet-bound packets.
When this WOULD be correct
In a scenario where a subnet has multiple NSGs applied and the most restrictive rule is blocking desired traffic, increasing the priority of a permissive NSG rule would allow that traffic. For example, if an NSG rule with lower priority is denying RDP, raising the priority of an allow-RDP rule would fix it.
- ✓
Remove the default UDR to the appliance and leave only the private-prefix routes in place.
Why this is correct
The 0.0.0.0/0 UDR is forcing all outbound traffic to the appliance, which prevents the NAT gateway from handling internet destinations. Removing that default route lets Azure use the system internet route, where the NAT gateway can provide outbound SNAT. Specific routes for private prefixes can remain and continue to send internal traffic to the appliance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Associate the NAT gateway with the virtual network instead of the subnet.
Why it's wrong here
NAT gateway association is done at subnet scope, so moving it to the VNet is not a valid configuration change.
When this WOULD be correct
In a scenario where a NAT gateway needs to provide outbound internet access for multiple subnets, and the current configuration has the NAT gateway only associated with one subnet, the correct fix would be to associate the NAT gateway with the virtual network (if supported) or create additional NAT gateways for each subnet. However, note that as of current Azure capabilities, NAT gateways are associated at the subnet level, not the virtual network level.
- ✗
Enable service endpoints on the subnet to bypass the appliance.
Why it's wrong here
Service endpoints are for Azure service access and do not change internet routing or NAT behavior.
When this WOULD be correct
If the question asked how to ensure traffic to Azure Storage or SQL Database from a subnet goes directly to the service without leaving the Azure network, enabling service endpoints would be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Remove the default UDR to the appliance and leave only the private-prefix routes in place.Correct answer▾
Why this is correct
The 0.0.0.0/0 UDR is forcing all outbound traffic to the appliance, which prevents the NAT gateway from handling internet destinations. Removing that default route lets Azure use the system internet route, where the NAT gateway can provide outbound SNAT. Specific routes for private prefixes can remain and continue to send internal traffic to the appliance.
✗Increase the priority of the NSG rules on the subnet.Wrong answer — click to see why▾
Why this is wrong here
NSG rules control inbound and outbound traffic at the network layer, but they do not influence routing decisions. The issue is that the 0.0.0.0/0 UDR overrides the NAT gateway's default route, so increasing NSG priority cannot redirect traffic to the NAT gateway.
★ When this WOULD be the correct answer
In a scenario where a subnet has multiple NSGs applied and the most restrictive rule is blocking desired traffic, increasing the priority of a permissive NSG rule would allow that traffic. For example, if an NSG rule with lower priority is denying RDP, raising the priority of an allow-RDP rule would fix it.
Why candidates choose this
Candidates may confuse NSG rules with routing, thinking that stricter NSG rules could force traffic through the NAT gateway, or they may overestimate the role of NSGs in controlling outbound internet paths.
✗Associate the NAT gateway with the virtual network instead of the subnet.Wrong answer — click to see why▾
Why this is wrong here
Associating a NAT gateway with the virtual network is not supported; NAT gateways must be associated with a specific subnet. This would not resolve the routing conflict where the 0.0.0.0/0 UDR to the appliance overrides the NAT gateway.
★ When this WOULD be the correct answer
In a scenario where a NAT gateway needs to provide outbound internet access for multiple subnets, and the current configuration has the NAT gateway only associated with one subnet, the correct fix would be to associate the NAT gateway with the virtual network (if supported) or create additional NAT gateways for each subnet. However, note that as of current Azure capabilities, NAT gateways are associated at the subnet level, not the virtual network level.
Why candidates choose this
Candidates may think that associating the NAT gateway at a higher scope (virtual network) would apply to all subnets, simplifying management, without realizing that Azure NAT gateways are subnet-level resources and cannot be associated with a virtual network.
✗Enable service endpoints on the subnet to bypass the appliance.Wrong answer — click to see why▾
Why this is wrong here
Service endpoints do not affect routing for outbound internet traffic; they only secure traffic to Azure services over the Azure backbone. The issue is a UDR overriding NAT gateway, not service access.
★ When this WOULD be the correct answer
If the question asked how to ensure traffic to Azure Storage or SQL Database from a subnet goes directly to the service without leaving the Azure network, enabling service endpoints would be correct.
Why candidates choose this
Candidates may confuse service endpoints with a method to bypass a network virtual appliance for internet traffic, not realizing service endpoints only apply to specific Azure services.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a NAT gateway automatically overrides a 0.0.0.0/0 UDR, but in Azure, UDRs always take precedence over system routes, so the explicit route to the NVA must be removed to allow the NAT gateway to handle internet traffic.
Detailed technical explanation
How to think about this question
Azure routes traffic based on the most specific prefix match, with user-defined routes (UDRs) taking precedence over system routes, including the NAT gateway's default route. The 0.0.0.0/0 UDR to the NVA matches all internet-bound traffic, so even with a NAT gateway on the subnet, traffic is forwarded to the NVA. Removing that UDR allows the NAT gateway's system route (also 0.0.0.0/0 but with lower priority) to become effective, while more specific private-prefix UDRs (e.g., 10.0.0.0/8) continue to direct private traffic to the NVA.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove the default UDR to the appliance and leave only the private-prefix routes in place. — The 0.0.0.0/0 user-defined route (UDR) to the network virtual appliance (NVA) has a higher priority than the NAT gateway's default route, so all internet-bound traffic is forced through the appliance. Removing that UDR while keeping private-prefix routes (e.g., 10.0.0.0/8) ensures that only private traffic uses the appliance, and internet traffic follows the NAT gateway's default route. This satisfies the business requirement of using the NAT gateway for internet traffic while preserving private routes through the NVA.
What should I do if I get this AZ-104 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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