- A
Internet, because the default route overrides more specific routes.
Why wrong: A default route is the least specific route available. It does not override a more specific route for the destination address.
- B
Network virtual appliance at 10.1.0.4, because user-defined routes always win over system routes.
Why wrong: User-defined routes do not automatically win when another route is more specific. Azure still applies longest-prefix matching before choosing the winning route.
- C
Virtual network peering, because the /20 peering route is more specific than 0.0.0.0/0.
Azure first selects the most specific matching prefix. The destination 10.50.18.25 falls inside the /20 peering route, which is more specific than the 0.0.0.0/0 forced-tunneling route. Because the longest prefix wins, traffic is sent over the peering path rather than to the NVA or the internet.
- D
None, because Azure disables routing when a subnet has both peering and a UDR.
Why wrong: Azure does not disable routing in this situation. It evaluates available routes and applies the route selection rules normally.
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. A key principle to apply: azure routing prioritizes the longest prefix match.. 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 has a user-defined route for 0.0.0.0/0 that sends traffic to a network virtual appliance at 10.1.0.4. The same virtual network is peered to a hub VNet that has a system route for 10.50.16.0/20. A VM in the subnet sends traffic to 10.50.18.25. Which next hop will Azure use?
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
Virtual network peering, because the /20 peering route is more specific than 0.0.0.0/0.
Azure uses the most specific route (longest prefix match) to determine next hop. The destination 10.50.18.25 falls within the 10.50.16.0/20 range of the peering route, which is more specific than the 0.0.0.0/0 UDR. Therefore, the traffic is routed via the virtual network peering, not the NVA.
Key principle: Azure routing prioritizes the longest prefix match.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Internet, because the default route overrides more specific routes.
Why it's wrong here
A default route is the least specific route available. It does not override a more specific route for the destination address.
- ✗
Network virtual appliance at 10.1.0.4, because user-defined routes always win over system routes.
Why it's wrong here
User-defined routes do not automatically win when another route is more specific. Azure still applies longest-prefix matching before choosing the winning route.
- ✓
Virtual network peering, because the /20 peering route is more specific than 0.0.0.0/0.
Why this is correct
Azure first selects the most specific matching prefix. The destination 10.50.18.25 falls inside the /20 peering route, which is more specific than the 0.0.0.0/0 forced-tunneling route. Because the longest prefix wins, traffic is sent over the peering path rather than to the NVA or the internet.
Related concept
Azure routing prioritizes the longest prefix match.
- ✗
None, because Azure disables routing when a subnet has both peering and a UDR.
Why it's wrong here
Azure does not disable routing in this situation. It evaluates available routes and applies the route selection rules normally.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume user-defined routes always override system routes, but Azure uses longest prefix match first, so a more specific system route (like a peering route) will take precedence over a less specific UDR.
Trap categories for this question
Scenario analysis trap
Azure does not disable routing in this situation. It evaluates available routes and applies the route selection rules normally.
Detailed technical explanation
How to think about this question
Azure routing uses the longest prefix match algorithm, where a /20 route (10.50.16.0/20) is more specific than a /0 route (0.0.0.0/0). Even though the UDR is user-defined, the system route for peering has a higher prefix length, so it wins. This behavior is consistent with RFC 4632 and applies regardless of route source (system, UDR, or BGP).
KKey Concepts to Remember
- Azure routing prioritizes the longest prefix match.
- Virtual network peering creates system routes for connected address spaces.
- A 0.0.0.0/0 route is the least specific route available.
- User-defined routes (UDRs) can override system routes, but only if they are equally or more specific.
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
Azure routing prioritizes the longest prefix match.
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 — Azure routing prioritizes the longest prefix match..
What is the correct answer to this question?
The correct answer is: Virtual network peering, because the /20 peering route is more specific than 0.0.0.0/0. — Azure uses the most specific route (longest prefix match) to determine next hop. The destination 10.50.18.25 falls within the 10.50.16.0/20 range of the peering route, which is more specific than the 0.0.0.0/0 UDR. Therefore, the traffic is routed via the virtual network peering, not the NVA.
What should I do if I get this AZ-104 question wrong?
Review azure routing prioritizes the longest prefix match., then practise related AZ-104 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Azure routing prioritizes the longest prefix match.
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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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