The answer is a route table with a user-defined route (UDR) sending 0.0.0.0/0 to 10.4.2.4. This configuration forces outbound internet traffic through the network virtual appliance because the UDR overrides Azure’s default system route for internet-bound traffic, which normally sends traffic directly out to the internet. By setting the next hop to the virtual appliance’s private IP, all egress traffic from the subnet is forwarded to the NVA for inspection, NAT, or logging—a core technique for forced tunneling and centralized internet egress in Azure. On the AZ-104 exam, this scenario tests your understanding of route tables and effective routes, often appearing as a trap where candidates mistakenly choose a firewall policy or a service endpoint instead of the explicit UDR. Remember the mnemonic: “Zero to Appliance” — for 0.0.0.0/0, point to the NVA’s IP to force all outbound internet through the virtual appliance.
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 workload subnet must send all outbound internet traffic through a network virtual appliance at 10.4.2.4. What should the administrator configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A route table with a user-defined route sending 0.0.0.0/0 to 10.4.2.4.
Option B is correct because a user-defined route (UDR) with a destination of 0.0.0.0/0 and a next hop of Virtual Appliance (10.4.2.4) overrides the default system route for internet traffic, forcing all outbound traffic from the subnet to be forwarded to the network virtual appliance (NVA) for inspection or NAT. This is the standard method to implement forced tunneling or centralized internet egress in Azure.
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.
✗
An NSG rule that allows outbound traffic to 10.4.2.4.
Why it's wrong here
An NSG can allow or deny traffic, but it does not choose the next hop for routing.
✓
A route table with a user-defined route sending 0.0.0.0/0 to 10.4.2.4.
Why this is correct
A default route in a user-defined route table forces all internet-bound traffic to the appliance as the next hop.
Related concept
Read the scenario before looking for a memorised answer.
✗
A private DNS zone for the subnet.
Why it's wrong here
DNS changes name resolution, but it does not redirect packet flow through a specific device.
✗
A service endpoint for the virtual network.
Why it's wrong here
Service endpoints secure access to supported PaaS services; they do not steer all outbound traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse NSG rules with routing: an NSG can block or allow traffic, but it cannot change the path traffic takes, so they incorrectly choose Option A thinking a permit rule will force traffic through the appliance.
Detailed technical explanation
How to think about this question
When you create a UDR with 0.0.0.0/0 pointing to a Virtual Appliance, Azure automatically adds a system route for 0.0.0.0/0 with next hop 'Internet' by default; the UDR takes precedence because it has a higher metric (lower priority number) than the system route. The NVA must be configured with IP forwarding enabled on its NIC and appropriate routing (e.g., SNAT or firewall rules) to handle the traffic; otherwise, the NVA will drop the packets. This pattern is commonly used in hub-and-spoke topologies where the hub NVA provides centralized security logging and egress control.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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: A route table with a user-defined route sending 0.0.0.0/0 to 10.4.2.4. — Option B is correct because a user-defined route (UDR) with a destination of 0.0.0.0/0 and a next hop of Virtual Appliance (10.4.2.4) overrides the default system route for internet traffic, forcing all outbound traffic from the subnet to be forwarded to the network virtual appliance (NVA) for inspection or NAT. This is the standard method to implement forced tunneling or centralized internet egress in Azure.
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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Question Discussion
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