- 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.
Quick Answer
The answer is to remove the 0.0.0.0/0 user-defined route (UDR) to the network virtual appliance while keeping all private-prefix routes intact. This is correct because Azure routes traffic based on the most specific prefix match, and a 0.0.0.0/0 UDR takes priority over a NAT gateway’s implicit default route for all internet-bound traffic, forcing it through the appliance instead. On the AZ-104 exam, this scenario tests your understanding of route priority and the interaction between system routes, UDRs, and NAT gateways—a common trap is assuming a NAT gateway overrides a default UDR, when in fact the UDR always wins for the 0.0.0.0/0 prefix. The business requirement is met because private routes (e.g., 10.0.0.0/8) remain pointing to the NVA for internal traffic, while internet traffic now follows the NAT gateway’s default route. Remember the memory tip: “Default UDR beats NAT; remove the zero to let the gateway go.”
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.
- ✓
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.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Associate the NAT gateway with the virtual network instead of the subnet.
- ✗
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.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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