- 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.
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.
When this WOULD be correct
This option would be correct if the question stated that all outbound traffic should use the VPN gateway, and the existing default route to the NVA is no longer needed. For example: 'A subnet currently sends all outbound traffic to an NVA. The administrator now wants all outbound traffic to use the VPN gateway instead. What should be done?'
- ✓
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.
When this WOULD be correct
This would be correct if the question asked to reduce the number of available IP addresses in a subnet to meet a specific requirement, such as avoiding overlapping address spaces or conserving IP addresses in a VNet.
- ✗
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.
When this WOULD be correct
A question where traffic from a subnet to an Azure service (e.g., Azure Storage account) must be routed directly to the service without going through a network virtual appliance or the internet, and the service endpoint must be enabled on the subnet and the service side.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Add a user-defined route for 10.50.0.0/16 with next hop type Virtual network gatewayCorrect answer▾
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.
✗Remove the default route so the system route to the VPN gateway is usedWrong answer — click to see why▾
Why this is wrong here
Removing the default route would break all other outbound traffic that needs to go through the network virtual appliance, not just traffic to 10.50.0.0/16. The requirement is to selectively route only the on-premises traffic via the VPN gateway while keeping the default route for other traffic.
★ When this WOULD be the correct answer
This option would be correct if the question stated that all outbound traffic should use the VPN gateway, and the existing default route to the NVA is no longer needed. For example: 'A subnet currently sends all outbound traffic to an NVA. The administrator now wants all outbound traffic to use the VPN gateway instead. What should be done?'
Why candidates choose this
Candidates may think that removing the default route will allow the system's built-in route for the VPN gateway to take effect, but they overlook that the system route for 10.50.0.0/16 only exists if the VPN gateway is connected to the virtual network, and removing the default route would disrupt other traffic.
✗Change the subnet address space to a smaller CIDR blockWrong answer — click to see why▾
Why this is wrong here
Changing the subnet address space to a smaller CIDR block does not affect routing decisions for traffic destined to 10.50.0.0/16; it only changes the IP range of the subnet itself, not the route table entries.
★ When this WOULD be the correct answer
This would be correct if the question asked to reduce the number of available IP addresses in a subnet to meet a specific requirement, such as avoiding overlapping address spaces or conserving IP addresses in a VNet.
Why candidates choose this
Candidates may mistakenly think that resizing the subnet can influence routing behavior, confusing subnet addressing with route prefixes.
✗Enable a service endpoint for the on-premises prefixWrong answer — click to see why▾
Why this is wrong here
Service endpoints are used to secure Azure service access from a subnet to a specific Azure service (like Azure Storage or SQL Database) by routing traffic directly to the service over the Azure backbone, not to route traffic to an on-premises network via a VPN gateway.
★ When this WOULD be the correct answer
A question where traffic from a subnet to an Azure service (e.g., Azure Storage account) must be routed directly to the service without going through a network virtual appliance or the internet, and the service endpoint must be enabled on the subnet and the service side.
Why candidates choose this
Candidates may confuse service endpoints with VPN or ExpressRoute connectivity, thinking that enabling a service endpoint for an on-premises prefix would somehow route traffic to on-premises, or they may misunderstand that service endpoints are only for Azure services, not on-premises networks.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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.
Visual reference
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: 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.
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Last reviewed: Jun 11, 2026
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