- A
Destination 0.0.0.0/0 with next hop Internet.
Why wrong: That route would send all outbound traffic directly to the Internet and would not target the 172.16.0.0/12 network specifically.
- B
Destination 172.16.0.0/12 with next hop Virtual appliance and next hop address 10.1.1.4.
A UDR should match the exact destination prefix that must be redirected. By adding 172.16.0.0/12 with next hop type Virtual appliance and the firewall private IP, Azure sends only that traffic to the appliance. All other traffic continues to follow the built-in system routes.
- C
Destination 172.16.0.0/12 with next hop Virtual network gateway.
Why wrong: A virtual network gateway is used for gateway-based connectivity, not for forwarding traffic to a firewall appliance in the VNet.
- D
Destination 172.16.0.0/12 with next hop None.
Why wrong: A None next hop would effectively blackhole the traffic instead of forwarding it to the firewall appliance.
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: uDRs override Azure's default system routes for specific traffic.. 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 VM in a spoke subnet must send all traffic destined for 172.16.0.0/12 to a firewall appliance at 10.1.1.4. All other destinations should continue to use Azure system routes. Which user-defined route should the administrator add to the subnet 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
Destination 172.16.0.0/12 with next hop Virtual appliance and next hop address 10.1.1.4.
Option B is correct because a user-defined route (UDR) with destination 172.16.0.0/12 and next hop type 'Virtual appliance' (with IP 10.1.1.4) overrides the default Azure system route for that prefix, forcing all traffic to the 172.16.0.0/12 range through the firewall at 10.1.1.4. This satisfies the requirement while leaving all other destinations (including 0.0.0.0/0) to be handled by Azure's default system routes.
Key principle: UDRs override Azure's default system routes for specific traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Destination 0.0.0.0/0 with next hop Internet.
Why it's wrong here
That route would send all outbound traffic directly to the Internet and would not target the 172.16.0.0/12 network specifically.
When this WOULD be correct
If the requirement were to force all outbound internet traffic from the subnet through a firewall for inspection, a route with destination 0.0.0.0/0 and next hop Virtual appliance (with the firewall's IP) would be correct.
- ✓
Destination 172.16.0.0/12 with next hop Virtual appliance and next hop address 10.1.1.4.
Why this is correct
A UDR should match the exact destination prefix that must be redirected. By adding 172.16.0.0/12 with next hop type Virtual appliance and the firewall private IP, Azure sends only that traffic to the appliance. All other traffic continues to follow the built-in system routes.
Related concept
UDRs override Azure's default system routes for specific traffic.
- ✗
Destination 172.16.0.0/12 with next hop Virtual network gateway.
- ✗
Destination 172.16.0.0/12 with next hop None.
Why it's wrong here
A None next hop would effectively blackhole the traffic instead of forwarding it to the firewall appliance.
When this WOULD be correct
This option would be correct if the requirement was to block all traffic to 172.16.0.0/12 (e.g., for security or compliance reasons) by dropping it at the subnet level, effectively creating a blackhole route.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Destination 172.16.0.0/12 with next hop Virtual appliance and next hop address 10.1.1.4.Correct answer▾
Why this is correct
A UDR should match the exact destination prefix that must be redirected. By adding 172.16.0.0/12 with next hop type Virtual appliance and the firewall private IP, Azure sends only that traffic to the appliance. All other traffic continues to follow the built-in system routes.
✗Destination 0.0.0.0/0 with next hop Internet.Wrong answer — click to see why▾
Why this is wrong here
The question requires traffic to 172.16.0.0/12 to be sent to a firewall, not all traffic. A 0.0.0.0/0 route would send all internet-bound traffic to the firewall, which is not the requirement and would break internet connectivity.
★ When this WOULD be the correct answer
If the requirement were to force all outbound internet traffic from the subnet through a firewall for inspection, a route with destination 0.0.0.0/0 and next hop Virtual appliance (with the firewall's IP) would be correct.
Why candidates choose this
Candidates may mistakenly think that a default route is needed to override system routes for the specific destination, or they confuse the need to route all traffic through the firewall with the specific requirement for only 172.16.0.0/12.
✗Destination 172.16.0.0/12 with next hop Virtual network gateway.Wrong answer — click to see why▾
Why this is wrong here
The next hop must be a virtual appliance (firewall) at 10.1.1.4, not a virtual network gateway. A virtual network gateway is used for VPN or ExpressRoute connections, not for routing to a firewall.
★ When this WOULD be the correct answer
If the question required sending traffic to 172.16.0.0/12 through a VPN or ExpressRoute connection (e.g., on-premises network), then the next hop would be Virtual network gateway.
Why candidates choose this
Candidates may confuse a virtual appliance firewall with a virtual network gateway, or think that any network virtual appliance is a gateway.
✗Destination 172.16.0.0/12 with next hop None.Wrong answer — click to see why▾
Why this is wrong here
Setting next hop to 'None' drops traffic to 172.16.0.0/12 instead of forwarding it to the firewall at 10.1.1.4, which violates the requirement that all traffic to that range must go through the firewall.
★ When this WOULD be the correct answer
This option would be correct if the requirement was to block all traffic to 172.16.0.0/12 (e.g., for security or compliance reasons) by dropping it at the subnet level, effectively creating a blackhole route.
Why candidates choose this
Candidates might think 'None' means no explicit next hop, so the system route would apply, but in Azure UDR, 'None' explicitly drops traffic, not falls back to system routes.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the 'Virtual appliance' next hop with 'Virtual network gateway' or assume a default route (0.0.0.0/0) is needed, but the requirement specifically limits the forced tunneling to only the 172.16.0.0/12 range, not all traffic.
Detailed technical explanation
How to think about this question
User-defined routes in Azure are evaluated based on the longest prefix match (LPM) algorithm, so a route for 172.16.0.0/12 (prefix length 12) will be more specific than a default 0.0.0.0/0 route (prefix length 0) for that range. The 'Virtual appliance' next hop type requires specifying an IP address (10.1.1.4) that must be reachable via a directly attached network interface; Azure does not perform ARP resolution for the next hop IP—it simply forwards the packet to the MAC address of the interface associated with that IP. In a hub-and-spoke topology, this UDR is typically applied to the subnet route table of the spoke, and the firewall appliance (e.g., Azure Firewall or a third-party NVA) must have IP forwarding enabled to handle the traffic.
KKey Concepts to Remember
- UDRs override Azure's default system routes for specific traffic.
- The 'Virtual appliance' next hop type is used to direct traffic to NVAs.
- A UDR's destination prefix must match the traffic to be redirected.
- Route tables are associated with subnets to apply UDRs.
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
UDRs override Azure's default system routes for specific traffic.
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.
Visual reference
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 — UDRs override Azure's default system routes for specific traffic..
What is the correct answer to this question?
The correct answer is: Destination 172.16.0.0/12 with next hop Virtual appliance and next hop address 10.1.1.4. — Option B is correct because a user-defined route (UDR) with destination 172.16.0.0/12 and next hop type 'Virtual appliance' (with IP 10.1.1.4) overrides the default Azure system route for that prefix, forcing all traffic to the 172.16.0.0/12 range through the firewall at 10.1.1.4. This satisfies the requirement while leaving all other destinations (including 0.0.0.0/0) to be handled by Azure's default system routes.
What should I do if I get this AZ-104 question wrong?
Review uDRs override Azure's default system routes for specific traffic., then practise related AZ-104 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
UDRs override Azure's default system routes for specific traffic.
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Last reviewed: Jun 11, 2026
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