Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
An administrator creates a route table with a UDR for 10.20.0.0/16 and next hop type Virtual appliance. A VM in the subnet still does not send that traffic to the appliance. The route table contents are correct. What should be checked first?
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
Whether the NSG has an outbound deny rule for port 80.
An NSG can block traffic, but the symptom here is that the UDR is not being used at all.
B
Best answer
Whether the route table is associated with the correct subnet.
A route table only affects traffic for the subnet to which it is associated. If the table exists and the route is correct but traffic still follows another path, the first thing to verify is that the VM's subnet is actually linked to that route table. Without that association, the UDR is never applied, even though the route definition itself looks valid.
C
Distractor review
Whether the VM uses a managed identity.
Managed identities are unrelated to routing behavior and do not influence packet forwarding decisions.
D
Distractor review
Whether the virtual machine is in an availability set.
Availability sets improve resilience, but they do not determine whether a UDR is applied to a subnet.
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: Whether the route table is associated with the correct subnet. — A UDR has no effect until it is associated with the target subnet. If the route entry is correct but traffic does not change, the most likely issue is that the route table is attached to the wrong subnet or not attached at all. Checking the subnet association is the right first troubleshooting step before looking at more complex causes such as BGP propagation or conflicting policies. Why others are wrong: An outbound NSG deny could block packets, but that is different from the route never being used. Managed identities do not affect network path selection. Availability sets are about VM placement and resilience, not routing. None of these explain a correct UDR that is not being applied to the subnet.
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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