- A
Keep the default route to the virtual appliance and add the NAT gateway to the subnet.
Why wrong: A user-defined default route will still take precedence for internet traffic, so the NAT gateway would not become the effective egress path.
- B
Remove the 0.0.0.0/0 UDR and associate the NAT gateway with the subnet.
NAT gateway is used for outbound internet traffic when the subnet does not already force that traffic elsewhere. Because the 0.0.0.0/0 UDR sends all internet-bound packets to the virtual appliance, NAT gateway cannot provide the source IP. Removing the UDR allows the subnet to use the NAT gateway for outbound connectivity as intended.
- C
Change the route next hop to Virtual network gateway.
Why wrong: A virtual network gateway is for hybrid connectivity, not internet egress through a NAT gateway, so this would not meet the requirement.
- D
Create an NSG outbound rule that allows internet traffic from the subnet.
Why wrong: NSGs can allow or deny traffic, but they do not determine the public source IP used for outbound internet connections.
Quick Answer
The correct answer is to remove the 0.0.0.0/0 user-defined route (UDR) and associate the NAT gateway with the subnet. This works because a NAT gateway automatically injects a default route (0.0.0.0/0) with a next hop of 'Internet' into the subnet’s route table, but it cannot override an existing UDR with the same prefix—the UDR must be deleted first. On the AZ-104 exam, this scenario tests your understanding of route precedence and how NAT gateways handle outbound internet traffic differently from forced tunneling. A common trap is thinking you can simply add the NAT gateway without removing the UDR, which would still send traffic to the on-premises appliance. Remember the key rule: a UDR always wins over system or gateway-propagated routes for the same address prefix. For a quick memory tip, think "NAT needs no UDR"—if you want a NAT gateway to handle internet egress, you must clear any conflicting 0.0.0.0/0 user-defined route first.
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 route table with a 0.0.0.0/0 user-defined route to an on-premises virtual appliance. The business now wants Azure VM outbound internet traffic to use a NAT gateway so the public source IP stays consistent, and the firewall appliance is no longer required for internet egress. 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 UDR and associate the NAT gateway with the subnet.
Option B is correct because removing the 0.0.0.0/0 user-defined route (UDR) that points to the on-premises virtual appliance and associating a NAT gateway with the subnet ensures that all outbound internet traffic from Azure VMs uses the NAT gateway's public IP address. The NAT gateway automatically creates a default route (0.0.0.0/0) with a next hop type of 'Internet' for the subnet, overriding any conflicting UDRs. This provides a consistent source IP for internet egress without requiring the firewall appliance.
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 to the virtual appliance and add the NAT gateway to the subnet.
Why it's wrong here
A user-defined default route will still take precedence for internet traffic, so the NAT gateway would not become the effective egress path.
- ✓
Remove the 0.0.0.0/0 UDR and associate the NAT gateway with the subnet.
Why this is correct
NAT gateway is used for outbound internet traffic when the subnet does not already force that traffic elsewhere. Because the 0.0.0.0/0 UDR sends all internet-bound packets to the virtual appliance, NAT gateway cannot provide the source IP. Removing the UDR allows the subnet to use the NAT gateway for outbound connectivity as intended.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Change the route next hop to Virtual network gateway.
- ✗
Create an NSG outbound rule that allows internet traffic from the subnet.
Why it's wrong here
NSGs can allow or deny traffic, but they do not determine the public source IP used for outbound internet connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a NAT gateway can coexist with a conflicting UDR (Option A) or that changing the next hop to a virtual network gateway (Option C) will provide internet egress, when in fact the UDR must be removed to allow the NAT gateway's default route to take effect.
Detailed technical explanation
How to think about this question
When a NAT gateway is associated with a subnet, Azure automatically adds a default route (0.0.0.0/0) with a next hop type of 'Internet' for that subnet, which takes precedence over any user-defined routes with the same prefix due to the order of route evaluation (system routes, then UDRs, then BGP routes). However, if a UDR with 0.0.0.0/0 already exists, it will override the NAT gateway's default route unless the UDR is removed. In real-world scenarios, this is critical when migrating from a forced-tunneling or firewall-based egress to a NAT gateway, as failing to remove the UDR will cause traffic to continue flowing through the appliance, defeating the purpose of the NAT gateway.
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
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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 UDR and associate the NAT gateway with the subnet. — Option B is correct because removing the 0.0.0.0/0 user-defined route (UDR) that points to the on-premises virtual appliance and associating a NAT gateway with the subnet ensures that all outbound internet traffic from Azure VMs uses the NAT gateway's public IP address. The NAT gateway automatically creates a default route (0.0.0.0/0) with a next hop type of 'Internet' for the subnet, overriding any conflicting UDRs. This provides a consistent source IP for internet egress without requiring the firewall appliance.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
2 more ways this is tested on AZ-104
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security team requires all outbound internet traffic from a workload subnet to pass through an NVA at 10.1.4.4. The subnet is already associated with an NSG that allows the traffic. Which UDR should the administrator add to the route table for that subnet?
medium- A.Destination 10.1.4.4/32 with next hop type Internet.
- ✓ B.Destination 0.0.0.0/0 with next hop type Virtual appliance and next hop IP 10.1.4.4.
- C.Destination 0.0.0.0/0 with next hop type Virtual network gateway.
- D.Destination 10.1.4.0/24 with next hop type None.
Why B: Option B is correct because a User Defined Route (UDR) with destination 0.0.0.0/0 and next hop type 'Virtual appliance' forces all outbound internet traffic from the subnet to be forwarded to the NVA at 10.1.4.4 for inspection. The 0.0.0.0/0 prefix matches all internet-bound traffic, and the 'Virtual appliance' next hop type enables routing to a private IP address within the virtual network, overriding the default system route that would otherwise send traffic directly to the Internet.
Variation 2. A security team requires all outbound traffic from a subnet to pass through an Azure Firewall at 10.1.0.4, including internet-bound traffic from the VMs. What should the administrator configure?
medium- A.Assign a NAT gateway to the subnet and leave the default routing in place.
- ✓ B.Create a route table with a 0.0.0.0/0 route to 10.1.0.4 and associate it with the subnet.
- C.Enable service endpoints for the subnet so outbound traffic stays private.
- D.Deploy a public IP on each VM and use NSG rules to inspect the traffic.
Why B: Option B is correct because creating a route table with a default route (0.0.0.0/0) pointing to the Azure Firewall private IP (10.1.0.4) and associating it with the subnet forces all outbound traffic, including internet-bound traffic, to be routed through the firewall. This ensures the firewall can inspect and control all egress traffic as required by the security team.
Last reviewed: Jun 11, 2026
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