Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A subnet is connected to a NAT gateway, but outbound connections to a public software update site are still leaving through a network virtual appliance. The route table contains a 0.0.0.0/0 user-defined route to the appliance, and the business wants the NAT gateway to handle internet traffic while preserving private routes to the appliance. What is the best fix?
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
Increase the priority of the NSG rules on the subnet.
NSGs filter traffic but do not decide the next hop for internet-bound packets.
B
Best answer
Remove the default UDR to the appliance and leave only the private-prefix routes in place.
The 0.0.0.0/0 UDR is forcing all outbound traffic to the appliance, which prevents the NAT gateway from handling internet destinations. Removing that default route lets Azure use the system internet route, where the NAT gateway can provide outbound SNAT. Specific routes for private prefixes can remain and continue to send internal traffic to the appliance.
C
Distractor review
Associate the NAT gateway with the virtual network instead of the subnet.
NAT gateway association is done at subnet scope, so moving it to the VNet is not a valid configuration change.
D
Distractor review
Enable service endpoints on the subnet to bypass the appliance.
Service endpoints are for Azure service access and do not change internet routing or NAT behavior.
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 default UDR to the appliance and leave only the private-prefix routes in place. — A NAT gateway only handles outbound internet traffic when the subnet actually uses the internet route. Because the subnet has a default UDR to the appliance, the appliance remains the next hop for all destinations, including public websites. The right fix is to remove the catch-all route and keep only the private-prefix routes that truly belong on the appliance. That restores normal internet routing and allows the NAT gateway to work. Why others are wrong: NSG changes do not alter routing or next-hop selection. NAT gateways are attached to subnets, not VNets, so that option is not valid. Service endpoints are unrelated to internet egress and do not bypass a virtual appliance. The problem is caused by route precedence, so the route table must be corrected rather than the filtering layer.
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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