The correct answer is a user-defined route (UDR) with a next hop of Virtual Appliance. This configuration forces all outbound internet traffic from Subnet-App to be forwarded to the network virtual appliance (NVA) in the hub subnet for inspection, overriding Azure’s default system route for 0.0.0.0/0 that would otherwise send traffic directly to the internet. On the AZ-104 exam, this scenario tests your understanding of forced tunneling and custom routing in hub-and-spoke topologies, often appearing as a scenario where you must choose between a Virtual Appliance next hop and a Virtual Network Gateway or Internet next hop. A common trap is selecting “Internet” as the next hop, which would bypass the NVA entirely. Remember the memory tip: “UDR with NVA next hop = forced inspection; anything else is a direct exit.”
AZ-104 Implement and Manage Virtual Networking Practice Question
This AZ-104 practice question tests your understanding of implement and manage virtual networking. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Your company deploys a network virtual appliance (NVA) in a hub subnet. All outbound internet traffic from Subnet-App in a spoke VNet must pass through the NVA for inspection. What should you configure on Subnet-App?
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 with a next hop of Virtual Appliance
A user-defined route (UDR) with a next hop of Virtual Appliance forces all outbound traffic from Subnet-App to be forwarded to the NVA for inspection. This overrides Azure's default system route for 0.0.0.0/0, which normally sends internet-bound traffic directly to the internet. By specifying the NVA's private IP as the next hop, you ensure traffic is routed through the hub subnet for inspection before leaving the network.
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 private DNS zone
Why it's wrong here
DNS affects name resolution, not forced routing through the appliance.
✓
A user-defined route with a next hop of Virtual Appliance
Why this is correct
This explicitly steers traffic from the subnet to the NVA for inspection.
Related concept
Read the scenario before looking for a memorised answer.
✗
A service endpoint for Microsoft.Storage
Why it's wrong here
Service endpoints optimize access to Azure services, not all internet-bound traffic.
✗
A NAT gateway on the NVA subnet only
Why it's wrong here
This does not by itself redirect the spoke subnet traffic through the NVA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a NATgateway (which translates source IPs) with a route-based forced tunneling solution, or they assume a service endpoint can redirect traffic through an NVA, when in fact service endpoints bypass forced tunneling by design.
Detailed technical explanation
How to think about this question
User-defined routes are implemented as entries in the effective route table of a subnet, with a next hop type of 'Virtual Appliance' requiring the private IP address of the NVA. The route for 0.0.0.0/0 with next hop Virtual Appliance overrides the default system route, but you must also ensure that the NVA itself can route the traffic (e.g., IP forwarding enabled on its NIC) and that the hub subnet has a default route (e.g., to an internet gateway) to avoid a routing loop. In a hub-and-spoke topology, this is often combined with VNet peering and 'Use remote virtual network gateway' settings to enable forced tunneling.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: A user-defined route with a next hop of Virtual Appliance — A user-defined route (UDR) with a next hop of Virtual Appliance forces all outbound traffic from Subnet-App to be forwarded to the NVA for inspection. This overrides Azure's default system route for 0.0.0.0/0, which normally sends internet-bound traffic directly to the internet. By specifying the NVA's private IP as the next hop, you ensure traffic is routed through the hub subnet for inspection before leaving the network.
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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Question Discussion
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