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 route tables use the longest prefix match to determine the next hop.. 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 route table with these user-defined routes: 10.10.0.0/16 to Virtual appliance, 10.10.5.0/24 to Virtual network gateway, and 10.10.5.128/25 to Virtual network. The subnet is attached to a VM that sends traffic to several destinations. Which three next-hop decisions are correct? Select three.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Traffic to 10.10.5.9 uses Virtual network gateway.
Option A is correct because the route table uses longest prefix match. The destination 10.10.5.9 falls within the 10.10.5.0/24 range, which has a more specific prefix (24 bits) than 10.10.0.0/16 (16 bits). The user-defined route for 10.10.5.0/24 specifies a next hop of Virtual network gateway, so traffic to 10.10.5.9 is forwarded to the gateway.
Key principle: Azure route tables use the longest prefix match to determine the next hop.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Traffic to 10.10.5.9 uses Virtual network gateway.
Why this is correct
The /24 route is more specific than the broader /16 route, so it wins for 10.10.5.9.
Related concept
Azure route tables use the longest prefix match to determine the next hop.
✓
Traffic to 10.10.5.200 uses Virtual network.
Why this is correct
The /25 route is the most specific match for 10.10.5.200, so it takes precedence.
Related concept
Azure route tables use the longest prefix match to determine the next hop.
✓
Traffic to 10.10.8.4 uses Virtual appliance.
Why this is correct
The destination matches only the broader 10.10.0.0/16 route, which points to the appliance.
Related concept
Azure route tables use the longest prefix match to determine the next hop.
✗
Traffic to 10.10.5.9 uses Virtual appliance.
Why it's wrong here
A more specific /24 route exists, so the broader /16 next hop is not chosen.
✗
Traffic to 8.8.8.8 uses Virtual appliance.
Why it's wrong here
No 10.10.x.x route matches 8.8.8.8, so the default system route would apply instead.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a broader route (like 10.10.0.0/16 to Virtual appliance) applies to all subnets, forgetting that more specific user-defined routes (like 10.10.5.0/24 to Virtual network gateway) take precedence via longest prefix match, and that public IPs like 8.8.8.8 are not matched by private address space routes.
Detailed technical explanation
How to think about this question
Azure route tables evaluate routes using longest prefix match (LPM) with a preference order: user-defined routes (UDRs) override system routes for matching prefixes, but more specific prefixes always win regardless of route type. The 10.10.5.128/25 route is a subset of 10.10.5.0/24, so traffic to 10.10.5.200 (which falls in 10.10.5.128/25) uses the Virtual network next hop, while traffic to 10.10.5.9 (outside that /25) uses the /24 route. For non-matching destinations, Azure falls back to system routes (e.g., Internet for 0.0.0.0/0), not the Virtual appliance.
KKey Concepts to Remember
Azure route tables use the longest prefix match to determine the next hop.
A /24 route is more specific than a /16 route for an overlapping IP address.
User-defined routes (UDRs) override default system routes for matching traffic.
Traffic not matching any UDR will follow Azure's default routing rules.
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 route tables use the longest prefix match to determine the next hop.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
Review azure route tables use the longest prefix match to determine the next hop., then practise related AZ-104 questions on the same topic to reinforce the concept.
Implement and Manage Virtual Networking — This question tests Implement and Manage Virtual Networking — Azure route tables use the longest prefix match to determine the next hop..
What is the correct answer to this question?
The correct answer is: Traffic to 10.10.5.9 uses Virtual network gateway. — Option A is correct because the route table uses longest prefix match. The destination 10.10.5.9 falls within the 10.10.5.0/24 range, which has a more specific prefix (24 bits) than 10.10.0.0/16 (16 bits). The user-defined route for 10.10.5.0/24 specifies a next hop of Virtual network gateway, so traffic to 10.10.5.9 is forwarded to the gateway.
What should I do if I get this AZ-104 question wrong?
Review azure route tables use the longest prefix match to determine the next hop., then practise related AZ-104 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Azure route tables use the longest prefix match to determine the next hop.
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