- A
Keep the default route and add a second NAT gateway to the subnet.
Why wrong: Azure does not support using two NAT gateways on the same subnet to solve routing precedence.
- B
Remove the 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes.
A subnet-level 0.0.0.0/0 UDR to a virtual appliance overrides the system route that would otherwise let the NAT gateway handle internet-bound traffic. Removing that default route restores normal outbound internet handling through the NAT gateway, while more specific routes for on-premises or private destinations can remain in place. This preserves both functionality and control.
- C
Disable network security groups on the subnet so the NAT gateway becomes active.
Why wrong: NSGs do not control next hop selection, and disabling them is not the correct routing fix.
- D
Set gateway route propagation to Disabled so the NAT gateway is preferred.
Why wrong: Gateway route propagation affects learned gateway routes, not the precedence of a default route to a virtual appliance.
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 has a NAT gateway attached, but outbound internet traffic from the VMs is still leaving through a network virtual appliance. The subnet's route table includes a user-defined route for 0.0.0.0/0 with the next hop set to Virtual appliance. The business wants internet traffic to use the NAT gateway while keeping any required specific routes to on-premises networks. What should the administrator do?
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 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes.
Option B is correct because the user-defined route (UDR) for 0.0.0.0/0 with next hop Virtual appliance is overriding the NAT gateway's default route. NAT gateways require a default route (0.0.0.0/0) with next hop 'Internet' to direct outbound traffic through them. By removing the conflicting UDR and keeping only specific routes for on-premises prefixes, the subnet will use the NAT gateway for internet traffic while maintaining connectivity to on-premises networks via the remaining UDRs.
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.
- ✗
Keep the default route and add a second NAT gateway to the subnet.
Why it's wrong here
Azure does not support using two NAT gateways on the same subnet to solve routing precedence.
- ✓
Remove the 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes.
Why this is correct
A subnet-level 0.0.0.0/0 UDR to a virtual appliance overrides the system route that would otherwise let the NAT gateway handle internet-bound traffic. Removing that default route restores normal outbound internet handling through the NAT gateway, while more specific routes for on-premises or private destinations can remain in place. This preserves both functionality and control.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable network security groups on the subnet so the NAT gateway becomes active.
Why it's wrong here
NSGs do not control next hop selection, and disabling them is not the correct routing fix.
- ✗
Set gateway route propagation to Disabled so the NAT gateway is preferred.
Why it's wrong here
Gateway route propagation affects learned gateway routes, not the precedence of a default route to a virtual appliance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think NAT gateways can coexist with a default UDR to a virtual appliance, or that disabling gateway propagation or adding more NAT gateways will override the UDR, when in fact the UDR's higher priority always wins for the 0.0.0.0/0 prefix.
Detailed technical explanation
How to think about this question
Azure routing uses a longest-prefix-match algorithm, and user-defined routes (UDRs) have a higher priority than system routes, including the default route created by a NAT gateway. When a UDR for 0.0.0.0/0 with next hop Virtual appliance exists, all internet-bound traffic is forwarded to the NVA, bypassing the NAT gateway entirely. The NAT gateway automatically creates a system default route (0.0.0.0/0, next hop Internet) only when no conflicting UDR is present; removing the conflicting UDR allows this system route to become effective.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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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 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes. — Option B is correct because the user-defined route (UDR) for 0.0.0.0/0 with next hop Virtual appliance is overriding the NAT gateway's default route. NAT gateways require a default route (0.0.0.0/0) with next hop 'Internet' to direct outbound traffic through them. By removing the conflicting UDR and keeping only specific routes for on-premises prefixes, the subnet will use the NAT gateway for internet traffic while maintaining connectivity to on-premises networks via the remaining UDRs.
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.
About these practice questions
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Last reviewed: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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