Question 757 of 1,170

Implement and Manage Virtual Networking →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to remove the 0.0.0.0/0 user-defined route from the subnet’s route table. This is correct because a NAT gateway automatically creates a default system route for internet-bound traffic, but a UDR for 0.0.0.0/0 with a next hop of Virtual appliance takes higher priority, forcing traffic through the NVA instead. On the AZ-104 exam, this scenario tests your understanding of route precedence and how NAT gateways interact with custom routes; a common trap is assuming both can coexist for the same destination prefix. The key insight is that a NAT gateway only works when the subnet’s effective route for 0.0.0.0/0 points to the internet, not to a virtual appliance. More specific routes, such as those for on-premises or peered networks, remain untouched because they have longer prefix lengths. Memory tip: “Default routes are exclusive—if a UDR claims 0.0.0.0/0, the NAT gateway gets no vote.”

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 outbound traffic from the VMs still leaves through a network virtual appliance because the subnet has a user-defined route for 0.0.0.0/0 with next hop type Virtual appliance. The workload must use the NAT gateway for internet-bound traffic while keeping more specific routes intact. What should the administrator change?

Question 1mediummultiple choice

Read the full NAT/PAT explanation →

A
Disable the subnet's network security group so the NAT gateway can take effect.
Why wrong: NSGs control filtering, not route selection. Removing an NSG would not change which next hop is chosen for internet traffic.
B
Remove the 0.0.0.0/0 user-defined route from the subnet route table.
A default UDR to a virtual appliance overrides the system default route, so the NAT gateway never becomes the effective internet egress path. Removing that default route restores normal outbound routing, and the NAT gateway can then provide the public source IP for internet-bound traffic. More specific UDRs for private prefixes can remain in place.
C
Enable gateway route propagation on the route table.
Why wrong: Gateway route propagation is for routes learned through a VPN or ExpressRoute gateway. It does not override a specific 0.0.0.0/0 UDR already sending traffic to a virtual appliance.
D
Attach a public IP address to each virtual machine NIC.
Why wrong: Individual public IPs would bypass the desired NAT gateway design and are operationally harder to manage. They also do not fix the existing route precedence issue.

Full breakdown with real-world context →

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 route table.

The NAT gateway is designed to provide outbound connectivity for VMs in the subnet, but a user-defined route (UDR) for 0.0.0.0/0 with next hop type Virtual appliance overrides the default route to the NAT gateway. By removing that UDR, the subnet's default route reverts to the system route, which directs internet-bound traffic to the NAT gateway's public IP. More specific routes (e.g., to on-premises networks) remain intact because they are not affected by the removal of the 0.0.0.0/0 route.

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.

✗
Disable the subnet's network security group so the NAT gateway can take effect.
Why it's wrong here
NSGs control filtering, not route selection. Removing an NSG would not change which next hop is chosen for internet traffic.
✓
Remove the 0.0.0.0/0 user-defined route from the subnet route table.
Why this is correct
A default UDR to a virtual appliance overrides the system default route, so the NAT gateway never becomes the effective internet egress path. Removing that default route restores normal outbound routing, and the NAT gateway can then provide the public source IP for internet-bound traffic. More specific UDRs for private prefixes can remain in place.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable gateway route propagation on the route table.
Why it's wrong here
Gateway route propagation is for routes learned through a VPN or ExpressRoute gateway. It does not override a specific 0.0.0.0/0 UDR already sending traffic to a virtual appliance.
✗
Attach a public IP address to each virtual machine NIC.
Why it's wrong here
Individual public IPs would bypass the desired NAT gateway design and are operationally harder to manage. They also do not fix the existing route precedence issue.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often think a NAT gateway requires a UDR to function, when in fact the NAT gateway works via the system default route and a UDR for 0.0.0.0/0 with a different next hop type will override it, breaking the NAT gateway's intended behavior.

Detailed technical explanation

How to think about this question

Azure uses a longest-prefix-match routing algorithm; a 0.0.0.0/0 UDR with next hop Virtual appliance has a shorter prefix length than any more specific route (e.g., 10.0.0.0/16), so it only affects traffic not matching a more specific route. The NAT gateway automatically creates a system default route for 0.0.0.0/0 with next hop 'Internet', but a UDR with the same prefix takes precedence (user-defined routes override system routes). In a real-world scenario, an organization might use a firewall NVA for inspecting traffic to on-premises or peered networks while using a NAT gateway for direct internet access to reduce latency and cost.

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 0.0.0.0/0 user-defined route from the subnet route table. — The NAT gateway is designed to provide outbound connectivity for VMs in the subnet, but a user-defined route (UDR) for 0.0.0.0/0 with next hop type Virtual appliance overrides the default route to the NAT gateway. By removing that UDR, the subnet's default route reverts to the system route, which directs internet-bound traffic to the NAT gateway's public IP. More specific routes (e.g., to on-premises networks) remain intact because they are not affected by the removal of the 0.0.0.0/0 route.

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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Same concept, more angles

1 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 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?

medium

A.Keep the default route and add a second NAT gateway to the subnet.
✓ B.Remove the 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes.
C.Disable network security groups on the subnet so the NAT gateway becomes active.
D.Set gateway route propagation to Disabled so the NAT gateway is preferred.

Why B: 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.

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