The answer is the effective routes for the network interface. This tool is correct because it displays the actual, consolidated route table applied to a specific VM’s NIC, combining system routes, BGP routes, and any user-defined routes (UDRs). When traffic from a VM unexpectedly reaches the internet through a network virtual appliance, the effective routes view reveals exactly which route—such as a UDR with a next hop type of VirtualAppliance—is overriding the default system route. On the AZ-104 exam, this scenario tests your ability to diagnose unexpected traffic paths by verifying the active routing state at the NIC level, a common trap being to check the subnet’s route table instead of the NIC’s effective routes, which may differ due to application security groups or custom configurations. Remember the memory tip: “Effective routes show what’s actually in effect, not just what’s configured.”
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Traffic from VM-App01 is unexpectedly reaching the internet through a network virtual appliance. You need to determine which route is currently applied to the virtual machine network interface. Which Azure tool should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Effective routes for the network interface
Effective routes for the network interface show the actual routes applied to a VM's NIC, including system routes, BGP routes, and user-defined routes (UDRs). Since traffic is unexpectedly reaching the internet through an NVA, you need to verify which route (e.g., a UDR with next hop type VirtualAppliance) is currently active. This tool directly displays the effective route table for the specific NIC, allowing you to identify the misconfigured route.
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.
✓
Effective routes for the network interface
Why this is correct
Effective routes reveal the current routing entries applied to the VM NIC.
Related concept
Read the scenario before looking for a memorised answer.
✗
NSG flow logs
Why it's wrong here
NSG flow logs show allowed and denied flows rather than the active routing table.
✗
Azure Advisor recommendations
Why it's wrong here
Advisor does not display effective route entries.
✗
Diagnostic settings for the activity log
Why it's wrong here
Activity log diagnostics capture control-plane operations, not active NIC routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network security group (NSG) flow logs with routing diagnostics, but NSG flow logs only show traffic filtering decisions, not the path traffic takes based on routes.
Trap categories for this question
Command / output trap
NSG flow logs show allowed and denied flows rather than the active routing table.
Detailed technical explanation
How to think about this question
Effective routes are computed by Azure based on the combination of system routes, BGP routes (if VPN/ExpressRoute is used), and UDRs applied to the subnet. The route with the longest prefix match (most specific) wins, and if multiple routes have the same prefix, the priority is: UDR > BGP > system route. In this scenario, a UDR with next hop type VirtualAppliance (pointing to the NVA's private IP) is likely overriding the default 0.0.0.0/0 system route, forcing internet-bound traffic through the NVA.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-104 question in full detail.
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: Effective routes for the network interface — Effective routes for the network interface show the actual routes applied to a VM's NIC, including system routes, BGP routes, and user-defined routes (UDRs). Since traffic is unexpectedly reaching the internet through an NVA, you need to verify which route (e.g., a UDR with next hop type VirtualAppliance) is currently active. This tool directly displays the effective route table for the specific NIC, allowing you to identify the misconfigured route.
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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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Traffic from VM-App01 is taking an unexpected path to the internet through a network virtual appliance. You need to determine which routes are actually applied to the VM network interface. Which Azure feature should you use?
hard
✓ A.Effective routes for the network interface
B.NSG flow logs
C.Azure Policy compliance
D.The subscription activity log
Why A: Effective routes for a network interface show the actual routes applied to the VM's NIC after combining all route sources (system routes, BGP, and user-defined routes). This allows you to verify whether traffic is being forced through the NVA or taking an unexpected path, by inspecting the next hop type and IP address for the 0.0.0.0/0 route.
Variation 2. Traffic from VM-App01 is unexpectedly reaching the internet through a virtual appliance. You need to see which routes are currently applied to the VM network interface. Which Azure tool should you use?
hard
✓ A.Effective routes for the network interface
B.NSG flow logs
C.Azure Policy compliance
D.Activity log
Why A: Effective routes for the network interface shows the actual, evaluated routes applied to a specific VM NIC, including system routes, BGP-advertised routes, and user-defined routes (UDRs). This tool resolves the order of route preference (longest prefix match) and confirms whether traffic is being forced through a virtual appliance (e.g., via a UDR with next hop type VirtualAppliance). It directly answers why VM-App01's traffic is reaching the internet unexpectedly.
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Question Discussion
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