- A
A user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway.
When gateway route propagation is disabled, the subnet no longer learns on-premises routes automatically from the VPN gateway. Adding a specific route for the on-premises prefix with next hop Virtual network gateway restores reachability to that network while keeping the forced-tunneling design for other traffic.
- B
A user-defined route for 172.16.0.0/16 with next hop type Internet.
Why wrong: Sending on-premises traffic to the Internet would not reach the private VPN network and would break the intended hybrid path.
- C
An NSG allow rule for TCP 172.16.0.0/16.
Why wrong: NSGs operate on ports and protocols, not destination route selection, so they cannot restore the missing hybrid route.
- D
A service endpoint for the on-premises network range.
Why wrong: Service endpoints are only for supported Azure services and do not apply to arbitrary on-premises prefixes over a VPN gateway.
Quick Answer
The answer is to add a user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway. Disabling gateway propagation on a route table removes the automatically learned routes from Azure’s VPN gateway, including the route to your on-premises network. Without that propagated route, the subnet has no path to 172.16.0.0/16, so you must explicitly define a user-defined route (UDR) that points that traffic to the Virtual network gateway, restoring connectivity. On the AZ-104 exam, this scenario tests your understanding of how gateway propagation and forced tunneling interact—a common trap is thinking the VPN gateway still works automatically after propagation is disabled. Remember: when you disable propagation, you must manually add a UDR for any on-premises prefix you want to reach. A helpful memory tip is “No propagation? Add a UDR destination.”
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 uses a route table with gateway route propagation disabled so internet-bound traffic can be forced through a network virtual appliance. After the change, VMs in the subnet can no longer reach servers in the on-premises network 172.16.0.0/16 over the VPN gateway. What should the administrator add 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
A user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway.
When gateway route propagation is disabled on a route table, the subnet no longer receives the default system routes that include the VPN gateway route for on-premises networks. To restore connectivity to 172.16.0.0/16, you must add a user-defined route (UDR) with next hop type 'Virtual network gateway', which explicitly directs traffic for that prefix through the VPN gateway. This overrides the missing propagated route and forces the traffic to the on-premises network correctly.
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.
- ✓
A user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway.
Why this is correct
When gateway route propagation is disabled, the subnet no longer learns on-premises routes automatically from the VPN gateway. Adding a specific route for the on-premises prefix with next hop Virtual network gateway restores reachability to that network while keeping the forced-tunneling design for other traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A user-defined route for 172.16.0.0/16 with next hop type Internet.
Why it's wrong here
Sending on-premises traffic to the Internet would not reach the private VPN network and would break the intended hybrid path.
- ✗
An NSG allow rule for TCP 172.16.0.0/16.
Why it's wrong here
NSGs operate on ports and protocols, not destination route selection, so they cannot restore the missing hybrid route.
- ✗
A service endpoint for the on-premises network range.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse routing (UDR) with filtering (NSG) or connectivity methods (service endpoints), assuming an NSG rule or service endpoint can fix a routing issue, when only a user-defined route with the correct next hop type can restore traffic flow to the on-premises network.
Detailed technical explanation
How to think about this question
Under the hood, Azure route tables have a system route for each on-premises address range learned via BGP when gateway route propagation is enabled. Disabling propagation removes those BGP-learned routes, so the subnet loses the route to 172.16.0.0/16. Adding a UDR with next hop 'Virtual network gateway' creates a forced tunnel that overrides the missing system route; the gateway then uses its BGP table to forward the traffic to the on-premises network. In a real-world scenario, this is common when you want to force all internet traffic through an NVA while still allowing site-to-site VPN traffic to flow directly through the gateway.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: A user-defined route for 172.16.0.0/16 with next hop type Virtual network gateway. — When gateway route propagation is disabled on a route table, the subnet no longer receives the default system routes that include the VPN gateway route for on-premises networks. To restore connectivity to 172.16.0.0/16, you must add a user-defined route (UDR) with next hop type 'Virtual network gateway', which explicitly directs traffic for that prefix through the VPN gateway. This overrides the missing propagated route and forces the traffic to the on-premises network correctly.
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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