Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A subnet has a NAT gateway attached, but outbound internet traffic from the VMs is still leaving through a network virtual appliance. The subnet's route table includes a user-defined route for 0.0.0.0/0 with the next hop set to Virtual appliance. The business wants internet traffic to use the NAT gateway while keeping any required specific routes to on-premises networks. What should the administrator do?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Keep the default route and add a second NAT gateway to the subnet.
Azure does not support using two NAT gateways on the same subnet to solve routing precedence.
B
Best answer
Remove the 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes.
A subnet-level 0.0.0.0/0 UDR to a virtual appliance overrides the system route that would otherwise let the NAT gateway handle internet-bound traffic. Removing that default route restores normal outbound internet handling through the NAT gateway, while more specific routes for on-premises or private destinations can remain in place. This preserves both functionality and control.
C
Distractor review
Disable network security groups on the subnet so the NAT gateway becomes active.
NSGs do not control next hop selection, and disabling them is not the correct routing fix.
D
Distractor review
Set gateway route propagation to Disabled so the NAT gateway is preferred.
Gateway route propagation affects learned gateway routes, not the precedence of a default route to a virtual appliance.
Common exam trap
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Technical deep dive
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Remove the 0.0.0.0/0 user-defined route and keep only specific routes for private prefixes. — The 0.0.0.0/0 UDR is forcing all internet traffic to the virtual appliance, which prevents the NAT gateway from being used. NAT gateway applies to outbound internet traffic when a more specific user-defined route does not override it. Removing the default route and retaining only specific private-prefix routes is the correct way to let internet traffic egress through NAT while still steering internal destinations as needed. Why others are wrong: Adding another NAT gateway is not a supported fix and does not address route precedence. NSGs filter traffic but do not decide the next hop. Gateway route propagation only controls whether routes learned from a gateway are added to the effective route table; it does not override a manually configured 0.0.0.0/0 route.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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