- A
Add a public IP address directly to each virtual machine NIC.
Why wrong: Per-VM public IPs do not provide a single shared outbound address for the entire subnet.
- B
Remove the 0.0.0.0/0 user-defined route from the subnet.
The default route to the virtual appliance forces all internet-bound traffic away from the subnet's NAT gateway. Because NAT gateway only handles outbound traffic that is not sent to another next hop, the UDR prevents the NAT gateway from being used. Removing the default route allows the subnet to use the NAT gateway's static public IP for outbound internet connections while keeping routing simple.
- C
Enable service endpoints for the subnet.
Why wrong: Service endpoints improve access to supported Azure services, but they do not provide a subnet-wide public outbound IP.
- D
Change the NAT gateway to a zone-redundant SKU.
Why wrong: NAT gateway does not use a zone-redundant SKU to solve routing precedence or outbound IP selection.
Quick Answer
The answer is to remove the 0.0.0.0/0 user-defined route (UDR) from the subnet’s route table. This is correct because a NAT gateway automatically creates a default outbound route for the subnet, but a conflicting UDR with a 0.0.0.0/0 prefix to a virtual appliance will override that default, forcing traffic through the appliance instead. By deleting the UDR, the subnet’s effective route for internet-bound traffic points to the NAT gateway, which uses Source Network Address Translation (SNAT) to provide a single static public IP for all outbound connections—exactly what the business requires. On the AZ-104 exam, this scenario tests your understanding of route priority: a more specific route wins, but for identical prefixes, a UDR takes precedence over system routes, including those from a NAT gateway. A common trap is thinking you need to modify the NAT gateway or add a new route, when the fix is simply removing the conflicting UDR. Memory tip: “No UDR, no fuss—NAT gateway takes the bus.”
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 associated with a NAT gateway, but its route table also contains a 0.0.0.0/0 route to a virtual appliance at 10.2.0.4. The business wants all outbound internet traffic from the VMs to use one static public IP, and inspection by the appliance is no longer required. What should the administrator change?
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 from the subnet.
The correct answer is B because removing the 0.0.0.0/0 user-defined route (UDR) from the subnet's route table will allow the NAT gateway to handle all outbound internet traffic. The NAT gateway provides a single static public IP for outbound traffic, and since inspection by the virtual appliance is no longer required, the conflicting UDR that directs traffic to the appliance must be deleted. This ensures that the subnet's default route points to the NAT gateway, which uses Source Network Address Translation (SNAT) to translate private IPs to the static public IP.
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.
- ✗
Add a public IP address directly to each virtual machine NIC.
- ✓
Remove the 0.0.0.0/0 user-defined route from the subnet.
Why this is correct
The default route to the virtual appliance forces all internet-bound traffic away from the subnet's NAT gateway. Because NAT gateway only handles outbound traffic that is not sent to another next hop, the UDR prevents the NAT gateway from being used. Removing the default route allows the subnet to use the NAT gateway's static public IP for outbound internet connections while keeping routing simple.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable service endpoints for the subnet.
Why it's wrong here
Service endpoints improve access to supported Azure services, but they do not provide a subnet-wide public outbound IP.
- ✗
Change the NAT gateway to a zone-redundant SKU.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think adding a public IP to VMs (Option A) is simpler or that service endpoints (Option C) can replace a NAT gateway for general internet access, but they fail to recognize that the existing UDR is the direct conflict preventing the NAT gateway from being the default route for outbound traffic.
Detailed technical explanation
How to think about this question
Under the hood, a NAT gateway uses SNAT to map VM private IPs to its public IP(s) for outbound traffic, and it requires the subnet's effective route for 0.0.0.0/0 to be the default Azure route (Next Hop Type: Internet) or the NAT gateway itself. A user-defined route with a higher priority (e.g., Next Hop: Virtual Appliance) overrides this, causing traffic to bypass the NAT gateway. In real-world scenarios, this is common after migrating from a third-party firewall to Azure NAT Gateway, where failing to remove the old UDR leads to asymmetric routing or dropped connections.
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.
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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 from the subnet. — The correct answer is B because removing the 0.0.0.0/0 user-defined route (UDR) from the subnet's route table will allow the NAT gateway to handle all outbound internet traffic. The NAT gateway provides a single static public IP for outbound traffic, and since inspection by the virtual appliance is no longer required, the conflicting UDR that directs traffic to the appliance must be deleted. This ensures that the subnet's default route points to the NAT gateway, which uses Source Network Address Translation (SNAT) to translate private IPs to the static public IP.
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
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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