- A
Remove the default route so the system route to the VPN gateway is used
Why wrong: Removing the default route would affect all non-specific destinations and is not the targeted fix.
- B
Add a user-defined route for 10.50.0.0/16 with next hop type Virtual network gateway
A more specific prefix takes precedence over the broader default route. By adding a route for 10.50.0.0/16 that points to the virtual network gateway, traffic to the on-premises network follows the gateway while all other destinations can still follow the default route to the appliance.
- C
Change the subnet address space to a smaller CIDR block
Why wrong: Subnet sizing does not control next-hop selection and would not change routing behavior.
- D
Enable a service endpoint for the on-premises prefix
Why wrong: Service endpoints apply to Azure service access, not to routing traffic toward on-premises networks.
Quick Answer
The answer is to add a user-defined route for the 10.50.0.0/16 prefix with the next hop type set to Virtual network gateway. This works because Azure routing uses longest prefix match, meaning the more specific route for 10.50.0.0/16 will take precedence over the existing default route of 0.0.0.0/0 that sends traffic to the NVA. On the AZ-104 exam, this scenario tests your understanding of how to override a default route with a specific route to a VPN gateway, a common trap being that candidates mistakenly try to modify the existing 0.0.0.0/0 route instead of adding a new, more specific one. Remember the key principle: you cannot change the default route’s next hop for a single destination; you must add a new route with a longer prefix. A helpful memory tip is “specific beats default”—when you need traffic for a particular network to bypass the NVA, always add a user-defined route for that exact prefix.
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 already has a user-defined default route (0.0.0.0/0) that sends all outbound traffic to a network virtual appliance. The administrator now needs traffic to the on-premises network 10.50.0.0/16 to use the VPN gateway instead of the appliance. What should be added to the route table?
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
Add a user-defined route for 10.50.0.0/16 with next hop type Virtual network gateway
Option B is correct because adding a user-defined route (UDR) for the specific prefix 10.50.0.0/16 with next hop type 'Virtual network gateway' creates a more specific route (longest prefix match) than the existing default route (0.0.0.0/0). This ensures traffic destined for the on-premises network is forwarded to the VPN gateway instead of the network virtual appliance, while all other outbound traffic continues to use the 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.
- ✗
Remove the default route so the system route to the VPN gateway is used
Why it's wrong here
Removing the default route would affect all non-specific destinations and is not the targeted fix.
- ✓
Add a user-defined route for 10.50.0.0/16 with next hop type Virtual network gateway
Why this is correct
A more specific prefix takes precedence over the broader default route. By adding a route for 10.50.0.0/16 that points to the virtual network gateway, traffic to the on-premises network follows the gateway while all other destinations can still follow the default route to the appliance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Change the subnet address space to a smaller CIDR block
Why it's wrong here
Subnet sizing does not control next-hop selection and would not change routing behavior.
- ✗
Enable a service endpoint for the on-premises prefix
Why it's wrong here
Service endpoints apply to Azure service access, not to routing traffic toward on-premises networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume removing the default route is necessary to force traffic through the VPN gateway, but they overlook that a more specific UDR for the on-premises prefix can coexist with the default route, allowing both paths to function correctly.
Detailed technical explanation
How to think about this question
Azure routes are evaluated using longest prefix match (LPM), so a UDR for 10.50.0.0/16 (prefix length /16) takes precedence over the default route 0.0.0.0/0 (prefix length /0). The VPN gateway uses BGP to propagate on-premises routes into the virtual network; if BGP is enabled, the system route for 10.50.0.0/16 with next hop 'Virtual network gateway' is automatically added, but a UDR can override or supplement this. In a hub-and-spoke topology, this pattern allows selective traffic steering—forcing specific on-premises ranges through the VPN while keeping internet traffic through a firewall appliance.
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.
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: Add a user-defined route for 10.50.0.0/16 with next hop type Virtual network gateway — Option B is correct because adding a user-defined route (UDR) for the specific prefix 10.50.0.0/16 with next hop type 'Virtual network gateway' creates a more specific route (longest prefix match) than the existing default route (0.0.0.0/0). This ensures traffic destined for the on-premises network is forwarded to the VPN gateway instead of the network virtual appliance, while all other outbound traffic continues to use the 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
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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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