- A
Add an NSG outbound allow rule for TCP 80 and TCP 443.
Why wrong: NSGs control allow or deny decisions, but they do not choose the outbound next hop for internet traffic.
- B
Remove or replace the 0.0.0.0/0 UDR to the virtual appliance and associate the NAT gateway with the subnet.
A NAT gateway provides stable outbound internet connectivity only when traffic follows the normal internet path from the subnet. The custom default route to a virtual appliance forces traffic away from that path, so the NAT gateway is bypassed. Removing or replacing the forced-tunnel route and then attaching the NAT gateway to the subnet allows outbound internet traffic to use the NAT gateway’s public IPs.
- C
Create a private endpoint for the web workload.
Why wrong: Private endpoints are for private access to PaaS services, not for outbound internet source IP control from a subnet.
- D
Enable VNet peering to a hub network with a firewall.
Why wrong: Peering can extend connectivity, but it does not by itself make the subnet use a NAT gateway for outbound internet traffic.
Quick Answer
The answer is to remove or replace the 0.0.0.0/0 user-defined route (UDR) pointing to the virtual appliance and associate the NAT gateway with the subnet. This is correct 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 a conflicting UDR with a higher priority (like one pointing to a virtual appliance) will override that automatic route, forcing traffic through the appliance instead. On the AZ-104 exam, this scenario tests your understanding of route precedence and how NAT gateways provide a stable source IP for outbound internet traffic, a common requirement for workloads that need consistent public IPs for whitelisting. A frequent trap is assuming you can simply associate the NAT gateway without adjusting the existing UDR, which would leave the appliance as the next hop. Memory tip: think of the NAT gateway as a "direct highway" to the internet—if a UDR is a "detour" through a virtual appliance, you must remove that detour sign to let traffic take the highway.
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 web workload in a subnet must use a NAT gateway for outbound internet traffic so the source IP is stable. The subnet currently has a route table with a 0.0.0.0/0 user-defined route to a virtual appliance. 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 or replace the 0.0.0.0/0 UDR to the virtual appliance and associate the NAT gateway with the subnet.
The current route table has a 0.0.0.0/0 user-defined route (UDR) pointing to a virtual appliance, which forces all outbound traffic through that appliance. To use a NAT gateway for outbound internet traffic with a stable source IP, the administrator must remove or replace that UDR (so the default route no longer points to the appliance) and associate the NAT gateway with the subnet. The NAT gateway automatically creates a default route (0.0.0.0/0) with a next hop of 'Internet', overriding the appliance route, ensuring traffic egresses via the NAT gateway's 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 an NSG outbound allow rule for TCP 80 and TCP 443.
Why it's wrong here
NSGs control allow or deny decisions, but they do not choose the outbound next hop for internet traffic.
- ✓
Remove or replace the 0.0.0.0/0 UDR to the virtual appliance and associate the NAT gateway with the subnet.
Why this is correct
A NAT gateway provides stable outbound internet connectivity only when traffic follows the normal internet path from the subnet. The custom default route to a virtual appliance forces traffic away from that path, so the NAT gateway is bypassed. Removing or replacing the forced-tunnel route and then attaching the NAT gateway to the subnet allows outbound internet traffic to use the NAT gateway’s public IPs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a private endpoint for the web workload.
Why it's wrong here
Private endpoints are for private access to PaaS services, not for outbound internet source IP control from a subnet.
- ✗
Enable VNet peering to a hub network with a firewall.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think adding a NAT gateway automatically overrides existing UDRs, but in Azure, user-defined routes have higher priority than system routes (including those from NAT gateways), so the existing UDR must be explicitly removed or modified for the NAT gateway to handle outbound traffic.
Detailed technical explanation
How to think about this question
A NAT gateway uses a default route (0.0.0.0/0, next hop 'Internet') that is automatically added to the subnet's effective routes when associated, but it does not override an existing user-defined route (UDR) with a higher priority (UDRs have a higher priority than system routes). Therefore, the existing UDR to the virtual appliance must be removed or replaced to allow the NAT gateway's default route to take effect. In practice, this is often done by deleting the UDR or changing its next hop to 'Internet' and associating the NAT gateway, ensuring all outbound traffic uses the NAT gateway's public IP for a consistent source address.
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 or replace the 0.0.0.0/0 UDR to the virtual appliance and associate the NAT gateway with the subnet. — The current route table has a 0.0.0.0/0 user-defined route (UDR) pointing to a virtual appliance, which forces all outbound traffic through that appliance. To use a NAT gateway for outbound internet traffic with a stable source IP, the administrator must remove or replace that UDR (so the default route no longer points to the appliance) and associate the NAT gateway with the subnet. The NAT gateway automatically creates a default route (0.0.0.0/0) with a next hop of 'Internet', overriding the appliance route, ensuring traffic egresses via the NAT gateway's 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.
About these practice questions
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Last reviewed: Jun 11, 2026
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